WO2015033174A1

WO2015033174A1 - Assembly, structure and method

Info

Publication number: WO2015033174A1
Application number: PCT/GB2014/052729
Authority: WO
Inventors: Roger SKEHAN
Original assignee: SKEHAN PROJECT SERVICES Ltd
Current assignee: SKEHAN PROJECT SERVICES Ltd
Priority date: 2013-09-09
Filing date: 2014-09-09
Publication date: 2015-03-12
Anticipated expiration: 2016-03-09
Also published as: GB2535900A; GB2535900A8; GB201316037D0

Abstract

A roof structure having a roof ventilation management assembly installed therein, the assembly comprising: a panel portion comprising at least a first panel member, the first panel member comprising a first panel element; and at least one panel support member being a separate component from the panel portion, the at least one panel support member being provided in the roof structure and configured to slidably support the first panel member such that the panel portion may be installed in the roof structure by sliding thereinto from outside the roof structure, the first panel member being slidably supported by the at least one support member such that at least a portion of the panel portion is located substantially directly above an external wall of a building, the structure being arranged wherein a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure.

Description

ASSEMBLY, STRUCTURE AND METHOD

TECHNICAL FIELD The present invention relates to roof structures. In particular embodiments of the present invention relate to the ventilation and insulation of roof structures.

BACKGROUND It is known to provide a building having a roof structure supported by external walls of the building. In the case of a sloping roof, rafters are typically arranged to support roofing felt and tiles that form an external skin of the roof. The rafters are supported by the external walls of the building and define the angle of slope or fall of the external skin. A roof structure 101 R commonly employed in buildings 101 B in the United Kingdom is shown in FIG. 1 . The building 101 B shown in FIG. 1 has external walls 105 in the form of cavity walls. That is, the walls 105 have an outer sacrificial skin 105A, an inner skin 105B, and a void or cavity 105C between the outer and inner skins. The cavity 105C may be filled with an insulating material in some known arrangements, such as a foam material.

The inner skin 105B of the external wall 105 has wall plates 1 10 mounted to an upper portion thereof to which rafters 120 of the roof structure 101 R are attached. The rafters 120 are inclined at a non-zero angle with respect to a horizontal plane, the angle defining the pitch angle of the roof structure 101 R. The pitch angle is typically from around 15 to 40 degrees but other values are also used. Joists 130 that support a ceiling panel 150 of a room directly below the roof structure 101 R meet the rafters 120 at the wall plates 1 10, the joists 130 and rafters 120 being fixedly attached to the wall plates 1 10, typically by means of nails or screws. Sheets of a roofing felt material 140 lie over the rafters 120 and are secured in place by lathes 145 that run transverse to the rafters 120. Roof tiles 162 lie over and are attached to the lathes 145. The roof tiles 162, lathes 145 and felt material 140 may be considered to form an outer skin 160 of the roof structure 101 R. A vertical fascia board 172 is attached to exposed lower ends of the rafters 120 to cover the exposed ends. A soffit board 174, lying in a substantially horizontal plane, runs from the fascia board 172 to the outer skin 105A of the external wall 105. The fascia board 172 in combination with the soffit board 174 prevent entry of wildlife into a roof void 101 V defined by the roof structure 101 R. The soffit board 174 has ventilation apertures 174A provided therein to allow a limited flow of external air through a gap between the external skin 160 of the roof structure 101 R and upper end of the external wall 105 and into the roof void 101 V. Such air flow is important in preventing build up of moisture, such as by condensation, within the roof void 101 V. The presence of moisture can cause damage to one or more portions of the roof structure 101 R. Ceiling insulation material 135 is typically provided over the ceiling panel 150 between and over the ceiling joists 130. However, installation of ceiling insulation material 135 becomes progressively more difficult the closer the material 135 is to the wall structure 105 due to the reducing amount of space above the joists 120 and below the rafters 120, restricting access for personnel and tooling.

The region of the roof structure 101 R above and outward of the wall structure 105 is commonly referred to as the roof 'eaves' region 101 E. The eaves region 101 E is generally not provided with insulation and is used to allow flow of air from the soffit ventilation apertures 174A to the roof void 101 V. It is also known to provide a ventilation aperture between the fascia board 172 and overlying roof tiles 145. The present applicant has recognised that the absence of insulation in this region may allow a not insignificant amount of heat to escape from a building. Furthermore, since the external walls 105 are typically provided with insulation in the cavity 105C and ceiling insulation material 135 is provided over the ceiling 150 panel, the proportion of heat lost through the eaves region 101 E may be relatively large.

Additionally, the poorer insulation performance of a building fabric around a junction between an external wall and roof structure can result in lower internal temperatures at the junction of an internal ceiling panel 150 with the external wall 105. If this temperature falls to a value at or below the dew point of air, an increased risk of mould growth exists. The growth of mould can be harmful to health.

One measure of heat loss through a linear junction between components of a building is a 'k' value (measured in units of Watts per linear metre per Celsius). Regulatory bodies set high standards in terms of required 'k' values for new buildings. The present applicant has recognised that improvement of 'k' values in a roof eaves region of a building may be accomplished by the provision of continuous insulation measures that connect insulation above the ceiling panel 150 with wall insulation, such as that which may be provided in wall cavity 105C. Such measures will reduce the risk that an internal wall or ceiling temperature falls to a value where condensation of airborne water vapour takes place. Other forms of construction such as solid wall and composite wall construction could also benefit from continuous insulation across a junction between building components in order to improve k values.

Further, the effectiveness of some types of insulation material is affected by air movement through the insulation material. Such measures that reduce air flow through the insulation material can improve the insulation performance of the material.

The present applicant has also recognised that it is important to ensure that installation of insulation does not cause blockage of air ventilation paths that allow ventilation of roof voids such as void 101 V shown in FIG. 1 .

It is well understood that blocking ventilation paths to un-insulated roof voids can cause condensation problems within the roof space leading to damage to the building fabric. Conversely, the more airtight a building structure is the more energy efficient it becomes. Therefore, a balance needs to be struck between ventilation and insulation.

Insulation laid between and over roof joists tends to be reduced in depth as it reaches the roof eaves, leading to a reduction in the insulation value of a roof structure, with the risk that if insulation is forced into the eaves region 101 E, there is a high risk that the ventilation route will become blocked, leading to condensation of airborne water vapour.

In certain circumstances, buildings are required to permit less than a prescribed volume of air to escape from the building per hour. Accordingly, reduced air permeability through junctions of a building are desired whilst still providing sufficient ventilation to prevent moisture build-up.

It is an aim of embodiments of the present invention to address disadvantages associated with the prior art.

SUMMARY OF THE INVENTION Embodiments of the invention may be understood with reference to the appended claims.

Aspects of the present invention provide a roof structure, a building, a roof ventilation management assembly, a roof insulation management assembly, a method and a kit of parts.

In one aspect of the invention for which protection is sought there is provided a roof structure having a roof ventilation management assembly installed therein, the assembly comprising:

a panel portion comprising at least a first panel member, the first panel member comprising a first panel element; and

at least one panel support member being a separate component from the panel portion,

the at least one panel support member being provided in of the roof structure and configured to slidably support the first panel member such that the panel portion may be installed in the roof structure by sliding thereinto from outside the roof structure, the first panel member being slidably supported by the at least one support member such that at least a portion of the panel portion is located substantially directly above an external wall of a building, the structure being arranged wherein a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure.

Embodiments of the present invention have the advantage that roof ventilation, and in particular roof eaves ventilation, may be managed in a cost effective manner. Embodiments of the invention allow insulation to be installed in a roof eaves region of a building in such a manner that a flowpath may be provided and maintained, allowing fresh air from outside the building to enter a roof structure. The flowpath may allow air flow over an internal surface of an external skin of a roof. The assembly may be referred to as a roof insulation management assembly in some embodiments.

The assembly may be a roof eaves ventilation management assembly. Embodiments of the invention allow a roof ventilation or insulation management assembly according to an embodiment of the invention to be retrofitted to a roof structure of a building in a highly conveniently manner. It is to be understood that the ability to slide a panel member into a roof structure above the external wall of the building thereby to provide a flowpath for air from outside the building into the building has the advantage that a roof structure may be adapted to provide a reliable flow of air into the roof structure. This can assist in preventing buildup of moisture in a roof structure, with the consequent risk of damage, for example due to growth of mould.

The assembly may be configured to allow the panel portion to be installed in the roof structure by sliding, supported by the at least one panel support member, after the panel support member has been installed. Advantageously, the panel portion may further comprise a second panel member comprising a first panel element,

wherein the second panel member is arranged to project downwardly from the first panel member such that the first and second panel members at least partially enclose an eaves region of the roof structure above the external wall of the building and below the first panel member.

The feature of the second panel member projecting downwardly assists in limiting air movement through insulation material that may be at least partially enclosed by the first and second panel members. The insulation material may for example be located within an eaves region of a roof structure. This may assist in ensuring that insulation provided in the eaves region, in particular insulation provided in a region above the external wall, is working at closer to its optimum performance than it would otherwise work if a flow of air were provided directly through the insulation material. Such a flow of air may result in a severe reduction in the effectiveness of insulation in the eaves region of a roof structure, and may result in cold bridging.

Advantageously the first and second panel members may be hingedly coupled to one another, the second panel member being configured to be swung from a raised position to a lowered position, wherein in the lowered position the second panel member projects downwardly to at least partially enclose the eaves region of the roof structure above the external wall of the building and below the first panel member. It is to be understood that the provision of a hinged second panel has the advantage that the second panel member may be swung to allow installation of an insulating material in a roof eaves region of a roof structure by raising the second panel member to the raised position, inserting insulation material, and subsequently placing the second panel member in the lowered position.

In an alternative embodiment the first and second panel members may be separate components. The components may be joined to one another after the first panel member has been installed in the roof structure.

The lowered position may be or include a position in which the second panel member lies in a substantially vertical plane. Advantageously the second panel member may be hingedly movable between a coplanar position in which the second panel member is substantially coplanar with the first panel member and the lowered position.

It is to be understood that panel portion may be configured such that the panel second panel member does not remain in the coplanar position unless supported in that position, for example by being held by an installer. The second panel member may be hingedly movable to a position in which it lies above the coplanar position.

Further advantageously, the second panel member may be swung upwardly from the coplanar position to a second position in which it lies in a plane that lies at a rotational position beyond a substantially vertical plane.

This feature has the advantage that, in use, the second panel member may be swung to a position in which it will not fall under gravity towards an installer located outboard of the panel portion. This allows the installer to introduce insulation material into the roof eaves region more conveniently.

The first and second panel members may be coupled together by means of a hinge member.

Optionally, the hinge member comprises a membrane. The hinge member may comprise a tape.

Optionally the hinge member may be or comprise an articulated hinge member.

The first and second panel members may be formed from a single panel provided with a living hinge portion defining a boundary between the first and second panel members.

By living hinge is meant that the material of the single panel provides the hinge between the first and second panel members that comprise the single panel.

Optionally, one or both of the first and second panel members may be provided with means for coupling the second panel to the first panel. Optionally, the means for attaching the second panel member to the first panel member comprises releasable coupling means.

Optionally, the coupling means comprises respective complementary inter-engaging formations provided in or on the first and second panel members.

The means for coupling may be such that the second panel member may be attached to the first panel member by an installer with the first panel member in-situ.

Optionally the structure has a roof void region, wherein the flowpath is arranged to allow air from outside the building to pass between the first panel element of the first panel member and the external skin of the roof structure and into a roof void region of the roof structure.

Optionally the first panel member further comprises a second panel element spaced apart from the first panel element, wherein the flowpath for air from outside the building passes between the first and second panel elements of the first panel member.

Optionally the first panel element of the first panel member comprises at least one spacer element protruding therefrom towards the external skin of the roof structure. Optionally the at least one spacer element is provided at a location away from longitudinal edges of the first panel element. Optionally the at least one spacer element has at least a portion provided at a location spaced apart from a longitudinal edge of the first panel element by at least 20% of a width of the panel, optionally at least 25%, further optionally at least 30% of the width of the panel.

Optionally the at least one spacer element comprises a longitudinal rib element spanning substantially the length of the first panel element.

Optionally the second panel element of the first panel member comprises at least one spacer element protruding therefrom towards the first panel element.

Optionally the at least one spacer element spans a gap between the first and second panel elements. It is to be understood that the first panel member may be formed from twin-wall material, one or more solid panels, one or more perforated panels, or one or more perforated panels surrounded by a membrane. Where present, the second panel member may be formed from the same or a different material to the first panel member. By twin-wall material is meant a material having two opposite-facing walls separated by a gap defining a channel to allow a flow of air therethrough between the walls. The walls may be substantially parallel. One or more rib elements may be provided to span a gap between the walls.

In some embodiments, the first panel member is formed from twin-wall material having longitudinal channels allowing flow of air therethrough from outside the building.

Flow or air from outside the building may be directed to an inner roof void or space.

The ventilation route can be formed through the twin wall structure as noted above, or by use of spacer channels and separate spacer members to separate the first panel member (which, as noted above, may for example be a solid panel, perforated panel or perforated panel surrounded by a membrane) from an underside of the external skin of the roof structure. In some embodiments the underside of the external skin of the roof structure may comprise a roofing membrane, optionally roofing felt or the like. The first panel element of one or both of the first and second panel members may be arranged to absorb moisture and/or to allow moisture to pass therethrough. That is, the first panel element of one or both of the first and second panel members may be breathable, and/or hygroscopic. This has the advantage that, if moisture builds up on an underside of the first element, for example due to condensation within the roof structure, the moisture may pass through the panel member and evaporate in the flow of air over the first panel element. In the case of a first panel element formed from a hygroscopic material the first panel member may absorb the moisture from the underside or side facing towards the building as opposed to the side facing upwardly or outwardly away from the building, and allow the moisture to evaporate into the flow of air over the outward facing, opposite side of the first panel element.

This feature is a very significant advantage of some embodiments of the present invention, solving the problems of providing a flowpath for air in the roof structure without compromising thermal insulation of a building whilst at the same time allowing management of moisture build-up in a roof structure, due for example to condensation.

Optionally the second panel member may be placed in a position in which the second panel element is provided substantially parallel to a wall of a building. Optionally the second panel member is arranged to be placed in a position in which the second panel element is provided substantially flush with an external wall of a building.

Optionally the second panel member is arranged to be placed in a position in which it lies in a spaced apart relationship outboard of an external wall of a building.

Optionally the second panel member is provided in a substantially vertical plane.

Optionally the panel portion is provided in contact with insulation material that is provided between the panel portion and an upper portion of the external wall.

Optionally the at least one panel support member comprises a panel support portion and a spacer portion, the spacer portion protruding from the panel support portion towards the external skin of the roof structure, the spacer portion spanning at least a portion of a gap between the first panel member and an inner surface of the external skin, the gap providing the flowpath for air from outside the building to pass between the first panel element of the first panel member and the external skin of the roof structure. The presence of the spacer portion may assist an installer of the assembly in the roof of a building ensure that the first panel member is not located too closely to the inner skin of the roof structure. For example, in some embodiments the spacer portion may protrude sufficiently from the panel support portion that, in the event the panel support portion is installed such that the spacer portion is in abutment with the inner skin, a distance between the first panel member and distal end of the spacer portion in contact with the inner skin is sufficient to provide a sufficiently wide flowpath for air. Optionally, the panel portion is slidably supported by the at least one support member between rafters of the roof structure.

Optionally the at least one panel support portion is coupled to a rafter of the roof structure. In an aspect of the invention for which protection is sought there is provided a building having an external wall and a roof structure having a roof ventilation management assembly according to an aspect of the present invention, optionally a roof eaves ventilation management assembly. In one aspect of the invention for which protection is sought there is provided a roof ventilation management assembly comprising a panel portion comprising first and second panel members, the first and second panel members each comprising a first panel element; and at least one panel support member formed as a separate component to the panel portion, the at least one panel support member being configured to be coupled to a rafter of a building, the assembly being configured wherein in use the at least one panel support member slidably supports the first panel member such that the panel portion may be installed in a roof structure by sliding thereinto from outside the roof structure after the panel support member has been installed, the first panel member being slidably supported by the at least one support member between rafters of the roof structure such that at least a portion of the panel portion is located substantially directly above an external wall of a building, the structure being arranged wherein a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure,

wherein the first and second panel members are hingedly coupled to one another, the second panel member being configured to be swung from a raised position to a lowered position, wherein in the lowered position the second panel member at least partially encloses an eaves region of the roof structure above the external wall of the building and below the first panel member.

The assembly may be a roof eaves ventilation management assembly.

In another aspect of the invention for which protection is sought there is provided a roof ventilation management assembly for installation in a roof structure of a building, comprising:

at least one panel support member formed as a separate component to the panel portion,

the at least one panel support member being configured to slidably support the first panel member such that the panel portion may be installed in a roof structure by sliding thereinto from outside the roof structure, the first panel member being configured to be slidably supported by the at least one support member such that, in use, at least a portion of the panel portion may be located substantially directly above an external wall of the building such that a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure.

The assembly may be a roof eaves ventilation management assembly.

Optionally, the panel portion further comprises a second panel member comprising a first panel element,

wherein the second panel member is arranged to project downwardly from the first panel member such that, in use, the first and second panel members at least partially enclose an eaves region of the roof structure above the external wall of the building and below the first panel member. Optionally, the first and second panel members are hingedly coupled to one another, the second panel member being configured to be swung from a raised position to a lowered position, wherein in the lowered position the second panel member projects downwardly to, in use, at least partially enclose the eaves region of the roof structure above the external wall of the building and below the first panel member. It is to be understood that the provision of a hinged second panel has the advantage that the second panel member may be swung to allow installation of an insulating material in a roof eaves region of a roof structure by raising the second panel member to the raised position, inserting insulation material, and subsequently placing the second panel member in the lowered position.

Optionally the second panel member is hingedly movable between a coplanar position in which the second panel member is substantially coplanar with the first panel member and the lowered position. Advantageously at least a portion of the first panel member may be arranged to absorb moisture and/or to allow moisture to pass therethrough. Thus at least a portion of the first panel member may be moisture permeable.

Further advantageously the first panel element of the first panel member may be arranged to absorb moisture and/or to allow moisture to pass therethrough. Thus the first panel element may be moisture permeable.

It is to be understood that moisture permeability may be achieved by use of a porous material for forming the component, such as the first panel element. The material may be microporous. Alternatively or in addition the material may be provided with perforations therethrough. Thus, a non-porous material such as a plastics material may be provided with perforations therethrough in order to become moisture permeable. The material may be an absorbent material. Optionally, the at least one panel support member comprises an elongate member having a channel cross-section.

Optionally, the at least one panel support member comprises an elongate member having a substantially right-angled angle cross-section. Optionally, the at least one panel support member comprises a spacer portion for spacing the first panel from a distal end of the spacer portion such that, in use, the at least one panel member may be spaced apart from an inner surface of the skin of the roof structure. Optionally, the at least one panel support member comprises an elongate member having a substantially F-shaped cross-section

The assembly may comprise a pair of panel support members for supporting opposite edges of the first panel member between eaves of a roof structure.

In one aspect of the invention for which protection is sought there is provided a method comprising:

providing an assembly comprising a panel portion and at least one panel support member being a separate component to the panel portion, the panel portion comprising at least a first panel member, the first panel member comprising a first panel element;

installing the at least one panel support member in a roof structure to slidably support the first panel member; and

sliding the panel portion into the roof structure from outside the roof structure by sliding, the first panel member being slidably supported by the at least one support member, whereby at least a portion of the panel portion is located substantially directly above an external wall of a building and whereby a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure. The method may comprise installing the panel portion in the roof structure by sliding thereinto from outside the roof structure, the first panel member being slidably supported by the at least one panel support member.

the method comprising providing the panel portion such that the second panel member projects downwardly from the first panel member such that the first and second panel members at least partially enclose an eaves region of the roof structure above the external wall of the building and below the first panel member. Optionally, the first and second panel members are hingedly coupled to one another, the method comprising swinging the second panel member from a raised position to a lowered position, wherein in the lowered position the second panel member projects downwardly to at least partially enclose the eaves region of the roof structure above the external wall of the building and below the first panel member.

The method may comprise swinging the second panel member upwardly from the coplanar position to a second position in which it lies in a plane that lies at a rotational position beyond a substantially vertical plane.

Optionally the method comprises causing the second panel member to lie against the external wall of the building.

The method may comprise providing the second panel member in spaced apart relation from the external wall.

The method may comprise providing an insulation material between the panel portion and an upper portion of the external wall. The method may comprise at least partially enclosing by means of the first and second panel members an insulation material provided above the external wall.

The method may comprise attaching an insulation material to an underside of at least a portion of the panel portion.

The method may comprise attaching an insulation material to an underside of at least a portion of the panel portion between the rafters.

In one aspect of the invention for which protection is sought there is provided a method of insulating and/or ventilating a building, comprising:

providing an assembly comprising a panel portion and at least one panel support portion, the panel portion comprising first and second panel members hingedly coupled to one another, the first and second panel members each comprising a first panel element; installing at least one support member between the rafters whereby the at least one support member is coupled to a rafter; and installing the panel member between rafters of a roof structure from outside the building by sliding, the first panel member being slidably supported between the rafters by the at least one support member, such that at least a portion of the panel portion is located substantially directly above an external wall of a building, and whereby a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure,

the method comprising hingedly swinging the second panel member from a raised position to a lowered position, wherein in the lowered position the second panel member at least partially encloses an eaves region of the roof structure above the external wall of the building and below the first panel member.

In one aspect of the invention for which protection is sought there is provided a kit of parts comprising a panel portion and instructions for implementing the method of another aspect. The kit may further comprise at least one panel support member.

In one aspect of the invention for which protection is sought there is provided a roof structure having a roof ventilation management assembly installed therein, the assembly comprising a panel portion comprising a panel member and at least one panel support member configured slidably to support the panel member, the panel member being supported by the at least one support member between rafters of a roof structure such that at least a portion of the panel portion is located substantially directly above an external wall of a building, the structure being arranged wherein a flowpath exists for air from outside the building to pass between the panel portion and an external skin of the roof.

The assembly may be a roof eaves ventilation management assembly.

Embodiments of the present invention have the advantage that roof ventilation may be managed in a cost effective manner. Some embodiments of the invention allow insulation to be installed in a roof eaves region of a building in such a manner that a flowpath may be provided and maintained, allowing fresh air from outside the building to enter a roof structure. The flowpath may allow air flow over an internal surface of an external skin of a roof. Embodiments of the invention allow a roof ventilation management assembly according to an embodiment of the invention to be retrofitted to a roof structure of a building in a highly conveniently manner. In one aspect of the invention for which protection is sought there is provided a roof structure having a roof insulation and/or ventilation management assembly installed therein, the assembly comprising:

a panel portion comprising a panel member;and

the at least one panel support member being coupled to a rafter and configured to support the panel member such that the panel portion may be installed after the panel support member has been installed, the panel member being supported by the at least one support member between rafters of a roof structure such that at least a portion of the panel portion is located substantially directly above an external wall of a building, the structure being arranged wherein a flowpath exists for air from outside the building to pass between the panel portion and an external skin of the roof.

The assembly may be a roof eaves ventilation management assembly.

Optionally the at least one panel support member comprises a spacer portion for spacing the first panel from a distal end of the spacer portion such that, in use, the at least one panel member may be spaced apart from the skin of the roof to provide the flowpath for air. Optionally the at least one panel support member comprises an elongate member having a substantially F-shaped cross-section.

The panel could be formed from a twin-wall material, solid panels, perforated panels, or perforated panels surrounded by membrane.

The ventilation route can be formed through the twin wall structure of a panel, or by use of spacer channels and separate spacer members to separate the solid, perforated or perforated panels surrounded by membrane from the underside of the roofing membrane. Embodiments of the present invention have the advantage that roof eaves insulation and/or ventilation may be managed in a cost effective manner. Embodiments of the invention allow insulation to be installed in a roof eaves region of a building in such a manner that a flowpath may be provided allowing fresh air from outside the building to flow over an internal surface of an external skin of a roof. Embodiments of the invention allow a roof eaves insulation and/or ventilation management assembly according to an embodiment of the invention to be retrofitted to a roof structure of a building in a highly convenient manner.

Optionally the structure has a roof void region, wherein the flowpath is arranged to allow air from outside the building to pass between the panel portion and the external skin of the roof and into the roof void region.

Optionally, the panel portion comprises a second panel member in addition to the first, the second panel member depending from the first and at least partially enclosing an eaves region above the external wall of the building. Optionally, the second panel member is provided substantially parallel to a wall of a building.

The wall may be an external wall.

It is to be understood that the second panel member may be secured against an external surface of an external wall of a building whilst the first panel member is provided between the rafters of the roof structure. The first and second panel members may be non-coplanar in the installed configuration.

Optionally, the second panel member is arranged to lie substantially flush with an external wall of a building.

The second panel member may be arranged to lie in a spaced apart relationship outboard of an external wall of a building. This feature has the advantage that additional insulation material may be provided in an eaves region of a roof structure. The eaves region may be at least partially enclosed by one or both of a fascia and a sofit. Insulation may be provided between the second panel and the external wall in some embodiments, as well as between the first panel and the external wall. Optionally, the first and second panel members are coupled to one another along a common edge.

The first and second panel members may be hingedly coupled to one another along the common edge.

The panel member may therefore be considered to be an articulated panel member having first and second portions hingedly connected to one another. It is to be understood that the presence of a hinge member between the first and second panel members facilitates provision of the panels in a non-coplanar configuration whilst enhancing an ease with which the panel portion may be manipulated compared with the provision of two separate and unconnected panel members. The first and second panel members may be formed from a single panel provided with a flexible hinge portion defining a boundary between the first and second panel members.

Optionally, the first and second panel members are coupled together by means of a hinge member.

The hinge member may comprise a pivoted hinge member. Alternatively the hinge member may comprise a flexible material, such as a tape.

Optionally, the second panel member is provided in a substantially vertical plane.

Optionally, the panel portion is provided in contact with insulation material that is provided between the panel portion and an upper portion of the external wall.

Provision of the panel member in contact with insulation material has the advantage that it reduces a risk that condensation forms in a gap between the panel member and the insulation material.

The panel portion may be breathable. In other words, the panel portion may be arranged to allow moisture to pass therethrough, for example by being absorbed and released. Thus if condensation comes into contact with an inner surface thereof, the moisture may be absorbed and subsequently released at an outer surface thereof, exposed to air flowing along the flowpath from outside the building between the panel member and the external skin of the roof. Optionally, the panel portion comprises at least one spacer element protruding from a face thereof towards an outer skin of the roof structure and having at least a portion thereof provided at a location away from longitudinal edges of the panel.

Optionally, the at least one spacer element has at least a portion provided at a location spaced apart from a longitudinal edge of a panel by at least 20% of a width of the panel, optionally at least 25%, further optionally at least 30% of the width of the panel.

Optionally, the at least one spacer element comprises a longitudinal rib element spanning substantially the length of a panel.

In a further aspect of the invention for which protection is sought there is provided a building having an external wall and a roof structure according to an aspect of the invention.

In one aspect of the invention for which protection is sought there is provided a roof insulation and/or ventilation management assembly comprising a panel portion comprising a panel member and at least one panel support member configured to support the panel member, the panel portion and panel support member being formed as separate components. The assembly may be a roof eaves ventilation management assembly.

Optionally the at least one panel support member comprises an elongate member having a channel cross-section. Alternatively the at least one panel support member may comprise an elongate member having a substantially right-angled angle cross-section.

Advantageously the panel portion may comprise first and second panel members hingedly coupled to one another. The assembly may comprise a pair of panel support members for supporting opposite edges of the panel portion between eaves of a roof structure.

In a further aspect of the invention for which protection is sought there is provided a method of insulating a building, comprising:

providing an assembly comprising a panel portion and at least one panel support portion, the panel portion comprising a panel member;

installing at least one support member between the rafters; and

installing the panel member between rafters of a roof structure such that the panel member is supported by the at least one support member between the rafters,

the method comprising installing the assembly whereby at least a portion of the panel portion is located substantially directly above an external wall of the building, whereby a flowpath exists for air from outside the building to pass between the panel portion and an external skin of the roof.

Optionally, providing the panel portion comprises providing a panel portion having a second panel member in addition to the first whereby the second panel member depends from the first, the method comprising causing the second panel member to lie against the external wall of the building.

The method may comprise providing the second panel member hingedly connected to the first.

Optionally, the method comprises providing an insulation material between the panel portion and an upper portion of the external wall.

The method may comprise at least partially enclosing by means of the first and second panel members an insulation material provided above the external wall. Optionally, the method comprises causing the second panel member to swing relative to the first panel member into abutment with the external wall thereby to at least partially enclose by means of the second panel member insulation material provided above the external wall.

The ability to swing the second panel provides highly convenient and effective access to the volume above the external wall. Furthermore, insulation material may be packed into a cavity between inner and outer skins of a cavity wall structure in some embodiments. The method may comprise providing the second panel member in spaced apart relation from the external wall and providing an insulation material between the second panel and the external wall.

Optionally, the method comprises sliding the panel portion into position between the rafters, supported by the at least one panel support member.

Optionally, the method comprises attaching an insulation material to an underside of at least a portion of the panel portion between the rafters. In a further aspect of the invention for which protection is sought there is provided a kit of parts comprising a panel portion and instructions for implementing the method of an aspect of the invention.

The kit may further comprise at least one panel support member.

In one aspect of the invention for which protection is sought there is provided a ventilation assembly comprising one or more support members such as one or more channel or angle members, a panel that may optionally be formed from rigid twin wall panel material or single board panel material, the panel having an articulated joint between upper and lower panel members, and an optional gel glue tape. The assembly can be installed either within existing buildings or in new construction.

In an aspect of the invention for which protection is sought there is provided a roof structure having a roof insulation and/or ventilation management panel portion installed therein, the panel portion comprising a panel member, the panel member being supported between rafters of a roof structure such that at least a portion of the panel member is located substantially directly above an external wall of a building, the structure being arranged wherein a flowpath exists for air from outside the building to pass between the panel member and an external skin of the roof. Within the scope of this application it is envisaged that the various aspects, embodiments, examples and alternatives, and in particular the individual features thereof, set out in the preceding paragraphs, in the claims and/or in the following description and drawings, may be taken independently or in any combination. For example features described in

connection with one embodiment are applicable to all embodiments, unless such features are incompatible.

BRIEF DESCRIPTION OF THE DRAWINGS One or more embodiments of the invention will now be described, by way of example only, with reference to the accompanying figures in which:

FIGURE 1 is a schematic illustration of a known roof structure in cross-section; FIGURE 2 is a schematic illustration of (a) components of a roof eaves insulation and/or ventilation management assembly according to an embodiment of the invention, (b) a channel member suitable for use in embodiments of the invention, and (c) a modified angle member suitable for use in embodiments of the present invention; FIGURE 3 is a schematic illustration of a roof structure with joist level insulation in which the assembly of FIG. 2 has been installed, forming a roof structure according to an embodiment of the present invention;

FIGURE 4 is a schematic illustration of a further roof structure according to an embodiment of the present invention as viewed along a viewing direction normal to the viewing direction of FIG. 3 showing (a) use of a twin-wall panel structure and (b) use of a solid panel structure;

FIGURE 5 is a schematic illustration of a further roof structure according to an embodiment of the present invention with rafter level insulation;

FIGURE 6 is a schematic illustration of a roof structure with joist level insulation in which the assembly of FIG. 2 has been installed, forming a roof structure according to an embodiment of the present invention; FIGURE 7 is a schematic illustration of (a) a panel portion according to an embodiment of the present invention in which first and second panel members are coupled together by means of a simple hinge; and a panel portion according to a further embodiment of the present invention in which first and second panel members are coupled together by means of an articulated hinge, the panel portion being shown (b) with the second panel member folded upwardly beyond a vertical orientation to lie against the first panel member and (c) with the second panel member depending vertically downwardly from the first panel member after being swung in the direction of arrow A; and FIGURE 8 is a schematic illustration of a panel support portion having a substantially F- shaped cross-section in (a) perspective view; and (b) cross-section as viewed along a direction substantially parallel to a rafter with a first panel member supported by the panel support portion, the panel support portion defining a lower boundary of an channel for the flow or air therethrough.

DETAILED DESCRIPTION

FIG. 2 shows components of a roof eaves insulation management assembly 280 or roof eaves ventilation management assembly 280 according to an embodiment of the present invention. The assembly may also be referred to as an insulation retention assembly. The assembly includes an articulated panel 280P having a first, upper, panel member 281 and a second, lower, panel member 283 hingedly connected by means of a hinge member 285. In the embodiment shown the upper panel members 281 is formed from a twin-wall rigid sheet material. The sheet material is formed by extrusion of a plastics material and has a pair of opposed walls which may be referred to as first (or upper) and second (or lower) panel elements 280A, 280B spaced apart by rib elements 280C which may also be referred to as spacer elements 280C. A total thickness of the sheet material is around 15cm although other thicknesses are also useful. The second panel member 283 is formed from a single panel element in the form of a substantially solid sheet of plastics material. In the embodiment shown the first panel member 281 is around 1 m x 0.5m in size and the second panel member is around 0.3m x 0.5m in size. Other sizes may be useful in some embodiments. Other materials may also be useful for forming the first and/or second panel members 281 , 283 such as calcium silicate board, a metal material such as aluminium or steel, or any other suitable material. The assembly 280 is configured such that air is able to flow between the first and second panel elements 280A, 280B, i.e. air is able to flow between the second (lower) panel element 280B and the external skin 160 of a roof 101 R in which the assembly 280 is installed. In some embodiments the first, upper, panel member 281 is in the form of a single panel element rather than two panel elements spatially separated. It is to be understood that either or both of the first and second panel elements 280A, 280B, or in the case of a panel member 281 formed from a single element, the single element, may be formed from a plurality of layers of material, for example in the form of a laminate of layers. The hinge member 285 is formed from a flexible adhesive tape that is adhered to an end portion of the respective panel members 281 , 283. In the embodiment of FIG. 2 the hinge member 285 is adhered to the second panel element 280B of the first panel member 281 and the second panel member 283. In some alternative embodiments the hinge member 285 may be adhered to the first panel element 280A of the first panel member and the second panel member 283. In some such embodiments the hinge member may be discontinuous or provided with apertures therethrough such that flow of air to the channels in the first panel member 281 is not prevented when the second panel member 283 is in a lowered, downward position, being the position in which the second panel member 283 is disposed in FIG. 2(a).

In the present embodiment the first and second panel members 281 , 283 are hinged such that the second panel member 283 may be folded back on the first panel member 281 such that the second panel member 281 lies substantially on top of the first panel member 283, in face to face contact therewith as shown in FIG. 2(d). In order to enable this configuration to be achieved the hinge member 285 is arranged such that a spacing S between the free edges of the first and second panel members 281 , 283 in contact with the hinge member 285 is sufficient to enable the hinge member 285 to wrap around the free end of the first panel member 281 . It is to be understood that the hinge member 285 may be referred to as an articulated hinge member 285 since it allows the axis about which the second panel member 283 rotates to be moved. FIG. 2(e) is a diagram corresponding to FIG. 2(d) showing the second panel member 283 in a substantially vertical plane, in abutment with insulation material 235.

Other forms of hinge member 285 may also be useful. For example in some embodiments the hinge member 285 may be a living hinge provided by a crease formed in a single panel or sheet and defining a boundary between the upper and lower panel members 281 , 283 comprised by the single panel or sheet.

The assembly 280 also includes a pair of channel members 291 C in the form of extruded members having a substantially C-shaped cross-section. The channel members 291 c are arranged to slidably support the panel 280P between a pair of adjacent rafters 220 of a roof structure 101 .

FIG. 3 shows the assembly 280 of FIG. 2 installed in a roof structure 201 R. The roof structure 201 R is similar to that of FIG. 1 and like features are shown with like reference signs prefixed numeral 2 instead of numeral 1 .

The assembly 280 is shown with the channel members 291 C fixedly attached to facing surfaces of a pair of adjacent rafters 220. The channel members 291 C are arranged with their longitudinal axes substantially parallel to a longitudinal axis of each rafter 220. Other arrangements are also useful. In some embodiments it may be advantageous to provide the channel members 291 C such that their longitudinal axes are at a non-zero angle to the corresponding longitudinal axes of the rafters 220. The upper panel member 281 of the articulated panel 280P is slidably received by the channel members 291 C and is supported along opposed longitudinal edges 280PE by the channel members 291 C. The lower panel member 283 rests in a substantially vertical plane against an upper portion of an outer face of outer skin 205A of outer wall 205. A volume enclosed by a lower region of upper panel member 281 and lower panel member 283 is filled with insulation material 280I. Filling of this volume with insulation material 280I may be performed for example when the lower panel member 283 is raised to a vertical, or greater than vertical position as depicted in Figure 2(d). In the embodiment shown the volume is packed with insulation material 280I in such a manner that the insulation material 280I is at least partially compressed against the upper and lower panel members 281 , 283. This is so as to prevent condensation forming due to the presence of pockets of air between the insulation material 280I and upper and lower panel members 281 , 283.

It can be seen that the insulation material 280I substantially fills a volume between the upper and lower panel members 281 , 283 and wall plates 210. The assembly 280 may be conveniently installed in new roof structures during construction before installation of fascia boards 272 and soffit boards 274. Alternatively, the assembly 280 may also be conveniently installed in existing roof structures, for example when replacement of fascia boards 272 and soffit boards 274 is carried out.

In one method of assembly, existing fascia boards and soffit boards are removed and channel members 291 C are attached to rafters 220 of the roof structure 201 R. Attachment of the channel members 291 C may be performed from within the roof structure 201 in some embodiments. The articulated panel 280P is then slid upwardly between the rafters from a lower end of the channel members 291 C, from outside the roof structure 201 although it is to be understood that in some embodiments the panel 280P may be slid downwardly from within the roof structure 201 R.

The panel 280P is slid a sufficient distance to allow the lower panel member 283 to be secured in a substantially vertical plane against the outer skin 205A of the outer wall 205 of the building bearing the roof structure 201 R. It is to be understood that the channel members 291 C are provided at locations that permit adequate flow of air from soffit ventilation apertures 274 to the roof void 201 V between the panel 280P and roof skin 260. The region behind the lower panel member 283 may be packed with insulation material 280I prior to securing the lower panel member 283 against the outer skin 205A of the outer wall 205. Alternatively, the lower panel member 283 may be secured against the outer skin 205A of the outer wall 205 and the region behind the lower panel member 283 packed with insulation material 280I from inside the roof void 201 V.

When insulation material 280I is being packed in the region that is or will be behind the lower panel member 283, the material 280I may be packed into an upper region of the cavity 205C between the inner and outer skins 205B, 205A of the wall 205 in order to further reduce heat loss through the outer wall 205.

Embodiments of the present invention have the advantage that a roof eaves region 201 E of a building may be provided with insulation material 280I and a volume of the region 201 E reserved for flow of air therethrough in a convenient, reliable and cost effective manner. The assembly 280 may be considered to retain insulation in position such that a flow path for air may be maintained as described above. Insulation is therefore prevented from blocking the flow path. In some embodiments, insulation material may be installed in a substantially continuous path from a region between ceiling joists 230 to a cavity 205C between inner and outer skins 205B, 205A of an external wall 205 of a building 201 B.

Instead of providing channel members 291 C for supporting the panel 280P, in some alternative embodiments angle members 291A may be provided as shown in FIG 2(b). The angle members 291 A may be of sufficient width to support the upper panel member 281 of the panel 280P.

In some embodiments, the angle members 291 A or channel members 291 C may be arranged to be adhesively coupled to the rafters 220. In some embodiments, a high strength gel glue tape may be affixed to a surface of the angle members 291A or channel members 291 C that is to be provided in abutment with the rafters 220. FIG. 2(c) shows an angle member 291 A with adhesive tape 292 bonded to a pair of external surfaces thereof. The tape 292 may have a removable protect sheet, removal of which exposes an adhesive surface of the tape 292 that may be pressed against a rafter 220 to secure the member 291 A to the rafter 220. The other of the two lengths of tape 292 is arranged to face downwardly and allow the attachment of an insulation panel such as a rigid of semi-rigid panel of insulation thereto as described below with respect to FIG. 5. Other arrangements are also useful. In some embodiments the channel member 291 C shown in FIG. 2(a) may be provided with adhesive tape 292 bonded to a pair of external surface thereof in a similar manner to the angle member 291A of FIG. 2(c). FIG. 4(a) is a view of the structure of FIG. 3 along the direction of arrow D shown in FIG. 3. A lower panel 283 of one panel 280P is shown in full, whilst a portion of another lower panel 283 is shown in cutaway view.

FIG. 4(b) is a corresponding view of the structure of FIG. 3 where the panel 380P is formed from a breathable solid panel material. That is, the upper and lower panel members 381 , 383 are each formed from a breathable solid material. The panel members 381 , 383 are each are formed from a single sheet of breathable solid material. This is in contrast to the twin-wall panel member 281 of FIG. 2(a) in which a pair of sheets are provided, separated by spacer elements to form channels for air flow through the panel member 281 . Like features of the embodiment of FIG. 4(b) to that of FIG. 4(a) are shown with like reference signs prefixed numeral 3 instead of numeral 2. The panels 380P are provided with two substantially parallel longitudinal spacer elements 381 S in the forms of ribs running along a length thereof. In the embodiment shown the spacer elements 381 S are each provided a distance approximately one quarter of a panel width from opposite longitudinal edges of the panels 380P. Other distances are also useful such as one third of a panel width. Other numbers of spacer elements 381 R are also useful.

The purpose of the spacer elements 381 R is to ensure that a flowpath for air exists and is maintained between the panels 380P and felt material 340 or other portion of an outer skin of the roof structure. In the embodiment shown the space elements 381 stand proud of the panels 380 by around 10mm although other distances such as 15mm, 20mm, 25mm or any other suitable distance are also useful. The spacer elements need not be in continuous form; the spacer elements may be provided in the form of discrete elements spaced apart along a length of a panel 380P in some embodiments.

As noted above the panel 380P is formed from a breathable material. In some embodiments a hygroscopic board material may be used, such as a calcium silicate board 6mm in thickness although other thicknesses may be useful in some embodiments. In some embodiments the upper and/or lower panel members 381 , 383 may be formed from a perforated board material. Perforations may be formed in the board to improve moisture management. The perforations may be formed for example by means of a spiked roller that is rolled over the board or by any other suitable means, including during moulding in the case of boards formed by moulding, such as by injection moulding.

In some embodiments the upper and/or lower panel members 381 , 383 may be formed from a perforated board material, covered with a porous membrane, such as a breathable woven material, a non-woven material or any other suitable material in order to improve moisture management.

FIG. 5 shows a roof structure 401 R according to a further embodiment of the present invention, forming part of a building 401 B. Like features of the embodiment of FIG. 5 to that of FIG. 3 are shown with like reference signs prefixed numeral 4 instead of numeral 2. The roof structure 401 R is similar that of FIG. 3 except that instead of providing ceiling insulation material 135 directly above ceiling panel 150, rafter-level insulation material 437 is provided between rafters 420. In the embodiment of FIG. 5 the rafter insulation material 437 is provided immediately behind (below) the upper panel member 481 of articulated panel 480P. The insulation material 437 may be in the form of rigid or semi-rigid boards that are secured between the rafters 420 of the roof structure 401 R. The material 437 may be secured directly to the upper panel member 481 , or to the member supporting the panel member 481 , in the present embodiment a channel member 491 C. As noted above, in some embodiments, a layer of adhesive 292 may be provided on an underside of an angle member 291A (FIG. 2) or channel member 491 C. The layer of adhesive 292 may be used to bond the insulation material 437 to the channel member 491 C. Other arrangements may also be useful. Bonding of the insulation panel to the underside of the angle member 491 C as shown in FIG. 5 may be arranged to provide reduced air leakage from one side of the upper panel member 481 into the roof void 401 V.

In some embodiments, the articulated panel 280P, 380P 480P may be arranged to allow insulation to be enclosed by the panel 280P, 380P 480P within the space that is partially enclosed by the fascia board 272, 372, 472 and sofit board 274, 374, 474. Thus in some embodiments the lower panel member 283, 383, 483 may be provided in spaced apart relationship with respect to the external wall 205, 305 405 of the building 201 B, 301 B, 401 B.

FIG. 6 shows a roof structure 501 R according to a further embodiment of the present invention, forming part of a building 501 B. Like features of the embodiment of FIG. 6 to those of the embodiment of FIG. 3 are shown with like reference signs prefixed numeral 5 instead of numeral 2. The structure 501 R of FIG. 6 differs from that of FIG. 2 in that a lower panel member 583 is provided in spaced apart relationship with outer skin 505A of the external wall 505. A spacer member 576 is attached to the external skin 505A between the lower panel member 583 and external skin 505A to seal a gap between the skin 505A and panel member 583. A volume above the spacer member 575 is filled with insulation material 580I. In the embodiment shown the volume above spacer member 575 and above outer skin 505A is packed with insulation material 580I such that the volume is substantially filled. The panel member 583 is provided in contact with the insulation material 580I such that any air gaps are relatively small compared with the overall volume and any condensation forming therein is substantially negligible. As noted above, the hinge member 285 of the embodiment of FIG. 2 is formed from a flexible adhesive tape. It is to be understood that the articulated hinge member may alternatively be formed from a solid material.

FIG. 7(a) shows an example of first and second panel members 681 , 683 that are hinged together by means of a solid hinge member 685 (in contrast to a hinge member formed from a flexible tape) that has a single pivot axis 685P1 . In the illustrated arrangement the second panel member 683 can be swung between a position in which it is substantially coplanar with the first panel member 681 and a position in which it hangs below the first panel member 681 , being suspended by means of the hinge member 685. It is to be understood that in the arrangement shown the second panel member 683 cannot be swung upwardly to a position beyond that at which it is substantially coplanar with the first panel member 681 . In some alternative single-pivot hinge arrangements the second panel member can be swung upwardly to a position beyond that at which it is substantially coplanar with the first panel member 681 .

FIG. 7(b) shows an example of an embodiment in which first and second panel members 781 , 783 are hinged together by means of a solid hinge member 785 that has two pivot axes 685P1 , 685P2. The arrangement shown permits the second panel member 683 to be swung in the direction of arrow A from a position in which it lies in face to face contact with the first panel member 781 , as shown in FIG. 7(b), on top of the first panel member 781 , to a position in which it hangs below the first panel member 781 as shown in FIG. 7(c). Other arrangements may be useful in some embodiments. In some embodiments a hinge member 685 having a single pivot point 685P1 may be provided that allows the second panel member 683 to swing from a position in which it hangs bellows the first panel member 681 in the orientation shown in FIG. 7(a) to a position in which it projects upwardly above the first panel member 681 . FIG. 8 shows a panel support member 891 F in the form of an extruded material component having a substantially F-shaped cross-section. The support member 891 F is shown in its normal upright orientation in FIG. 8(a) and (b), being an inverted "F" shape in its in-use orientation. In the present embodiment the extruded material is an extruded plastics material although other materials may be useful such as steel, aluminium material, timber or any other suitable material. The support member 891 F may be consider to have a channel portion 891 C arranged to slidably support a panel 280P between a pair of adjacent rafters 220 of a roof structure 101 in a similar manner to the channel member 291 C illustrated in FIG. 2(a). The channel member 891 C has a spacer portion 891 S protruding therefrom, extending the C-shaped channel member 891 C to form a structure having an F-shaped cross-section.

FIG. 8(b) shows the support member 891 F in the in-use configuration coupled to a rafter 220 of a roof structure. The support member 891 F is shown supporting a first (or upper) panel member 281 in spaced apart relationship with the inner skin of the roof structure which has a layer of felting material 240. In the arrangement shown the felting material lies in abutment with the rafter 220, the support member 891 F being in turn supported in abutment with the felting material 240. It is to be understood that, by adjusting a height of the spacer portion 891 S, a distance between the first panel member 281 and the inner skin may be adjusted thereby to adjust the size of the flow path for air from outside the building between the first panel member 281 and the inner skin.

Throughout the description and claims of this specification, the words "comprise" and "contain" and variations of the words, for example "comprising" and "comprises", means "including but not limited to", and is not intended to (and does not) exclude other moieties, additives, components, integers or steps.

Throughout the description and claims of this specification, the singular encompasses the plural unless the context otherwise requires. In particular, where the indefinite article is used, the specification is to be understood as contemplating plurality as well as singularity, unless the context requires otherwise.

Features, integers, characteristics, compounds, chemical moieties or groups described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith.

Claims

CLAIMS:

1 . A roof structure having a roof ventilation management assembly installed therein, the assembly comprising:

the at least one panel support member being provided in the roof structure and configured to slidably support the first panel member such that the panel portion may be installed in the roof structure by sliding thereinto from outside the roof structure, the first panel member being slidably supported by the at least one support member such that at least a portion of the panel portion is located substantially directly above an external wall of a building, the structure being arranged wherein a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure.

2. A structure according to claim 1 wherein the panel portion further comprises a second panel member comprising a first panel element,

wherein the second panel member is arranged to project downwardly from the first panel member such that the first and second panel members at least partially enclose an eaves region of the roof structure above the external wall of the building and below the first panel member. 3. A structure according to claim 2 wherein the first and second panel members are hingedly coupled to one another, the second panel member being configured to be swung from a raised position to a lowered position, wherein in the lowered position the second panel member projects downwardly to at least partially enclose the eaves region of the roof structure above the external wall of the building and below the first panel member.

4. A structure according to claim 3 wherein the second panel member is hingedly movable between a coplanar position in which the second panel member is substantially coplanar with the first panel member and the lowered position.

5. A structure according to claim 4 configured wherein the second panel member may be swung upwardly from the coplanar position to a second position in which it lies in a plane that lies at a rotational position beyond a substantially vertical plane. 6. A structure according to any one of claims 2 to 5 wherein the first and second panel members are coupled together by means of a hinge member.

7. A structure according to claim 6 wherein the hinge member comprises a membrane. 8. A structure according to claim 6 or claim 7 wherein the hinge member comprises a tape.

9. A structure according to any one of claims 6 to 8 wherein the hinge member is an articulated hinge member.

10. A structure according to any one of claims 2 to 9 wherein the first and second panel members are formed from a single panel provided with a living hinge portion defining a boundary between the first and second panel members. 1 1 . A structure according to claim 2 wherein one or both of the first and second panel members are provided with means for coupling the second panel to the first panel.

12. A structure according to claim 1 1 wherein the means for attaching the second panel member to the first panel member comprises releasable coupling means.

13. A structure according to claim 1 1 or claim 12 wherein the coupling means comprises respective complementary inter-engaging formations provided in or on the first and second panel members. 14. A structure according to any preceding claim having a roof void region, wherein the flowpath is arranged to allow air from outside the building to pass between the first panel element of the first panel member and the external skin of the roof structure and into a roof void region of the roof structure. 15. A structure according to any preceding claim wherein the first panel member further comprises a second panel element spaced apart from the first panel element, wherein the flowpath for air from outside the building passes between the first and second panel elements of the first panel member.

16. A structure according to any preceding claim wherein the first panel element of the first panel member comprises at least one spacer element protruding therefrom towards the external skin of the roof structure.

17. A structure according to claim 16 wherein the at least one spacer element is provided at a location away from longitudinal edges of the first panel element.

18. A structure according to claim 17 wherein at least one spacer element has at least a portion provided at a location spaced apart from a longitudinal edge of the first panel element by at least 20% of a width of the panel, optionally at least 25%, further optionally at least 30% of the width of the panel.

19. A structure according to claim 17 or 18 wherein the at least one spacer element comprises a longitudinal rib element spanning substantially the length of the first panel element. 20. A structure according to claim 15 or any one of claims 16 to 19 as depending through claim 1 wherein the second panel element of the first panel member comprises at least one spacer element protruding therefrom towards the first panel element.

21 . A structure according to any one of claims 16 to 20 as depending through claim 15 wherein the at least one spacer element spans a gap between the first and second panel elements.

22. A structure according to any preceding claim wherein the first panel element of one or both of the first and second panel members is arranged to absorb moisture and/or to allow moisture to pass therethrough.

23. A structure according to claim 2 or any one of claims 3 to 22 depending through claim 2 wherein the second panel member may be placed in a position in which the second panel element is provided substantially parallel to a wall of a building.

24. A structure according to claim 2 or any one of claims 3 to 23 depending through claim 2 wherein the second panel member is arranged to be placed in a position in which the second panel element is provided substantially flush with an external wall of a building. 25. A structure according to claim 2 or any one of claims 3 to 23 depending through claim 2 wherein the second panel member is arranged to be placed in a position in which it lies in a spaced apart relationship outboard of an external wall of a building.

26. A structure according to claim 2 or any one of claims 3 to 25 depending through claim 2 wherein the second panel member is provided in a substantially vertical plane.

27. A structure according to any preceding claim wherein the panel portion is provided in contact with insulation material that is provided between the panel portion and an upper portion of the external wall.

28. A structure according to any preceding claim wherein the at least one panel support member comprises a panel support portion and a spacer portion, the spacer portion protruding from the panel support portion towards the external skin of the roof structure, the spacer portion spanning at least a portion of a gap between the first panel member and an inner surface of the external skin, the gap providing the flowpath for air from outside the building to pass between the first panel element of the first panel member and the external skin of the roof structure.

29. A structure according to any preceding claim wherein the panel portion is slidably supported by the at least one support member between rafters of the roof structure.

30. A structure according to any preceding claim wherein the at least one panel support portion is coupled to a rafter of the roof structure. 31 . A building having an external wall and a roof structure having a roof ventilation management assembly according to any preceding claim.

32. A roof ventilation management assembly for installation in a roof structure of a building, comprising:

a panel portion comprising at least a first panel member, the first panel member comprising a first panel element; and at least one panel support member formed as a separate component to the panel portion,

33. An assembly according to claim 32 wherein the panel portion further comprises a second panel member comprising a first panel element,

wherein the second panel member is arranged to project downwardly from the first panel member such that, in use, the first and second panel members at least partially enclose an eaves region of the roof structure above the external wall of the building and below the first panel member.

34. An assembly according to claim 33 wherein the first and second panel members are hingedly coupled to one another, the second panel member being configured to be swung from a raised position to a lowered position, wherein in the lowered position the second panel member projects downwardly to, in use, at least partially enclose the eaves region of the roof structure above the external wall of the building and below the first panel member.

35. An assembly according to claim 34 wherein the second panel member is hingedly movable between a coplanar position in which the second panel member is substantially coplanar with the first panel member and the lowered position.

36. An assembly according to any one of claims 33 to 35 wherein the first panel element of the first panel member is arranged to absorb moisture and/or to allow moisture to pass therethrough.

37. An assembly according to any one of claims 32 to 36 wherein the at least one panel support member comprises an elongate member having a channel cross-section.

38. An assembly according to any one of claims 32 to 36 wherein the at least one panel support member comprises an elongate member having a substantially right-angled angle cross-section. 39. An assembly according to any one of claims 32 to 38 wherein the at least one panel support member comprises a spacer portion for spacing the first panel from a distal end of the spacer portion such that, in use, the at least one panel member may be spaced apart from an inner surface of the skin of the roof structure. 40. An assembly according to claim 39 wherein the at least one panel support member comprises an elongate member having a substantially F-shaped cross-section

41 . An assembly according to any one of claims 32 to 40 comprising a pair of panel support members for supporting opposite edges of the first panel member between eaves of a roof structure.

42. A method of ventilating a roof structure comprising:

providing an assembly comprising a panel portion and at least one panel support member formed as a separate component to the panel portion, the panel portion comprising at least a first panel member, the first panel member comprising a first panel element;

sliding the panel portion into the roof structure from outside the roof structure by sliding, the first panel member being slidably supported by the at least one support member, whereby at least a portion of the panel portion is located substantially directly above an external wall of a building and whereby a flowpath exists for air from outside the building to pass between the first panel element of the first panel member and an external skin of the roof structure. 43. A method according to claim 42 comprising installing the panel portion in the roof structure by sliding thereinto from outside the roof structure, the first panel member being slidably supported by the at least one panel support member.

44. A method according to claim 42 or 43 whereby the panel portion further comprises a second panel member comprising a first panel element, the method comprising providing the panel portion such that the second panel member projects downwardly from the first panel member such that the first and second panel members at least partially enclose an eaves region of the roof structure above the external wall of the building and below the first panel member.

45. A method according to claim 44 whereby the first and second panel members are hingedly coupled to one another, the method comprising swinging the second panel member from a raised position to a lowered position, wherein in the lowered position the second panel member projects downwardly to at least partially enclose the eaves region of the roof structure above the external wall of the building and below the first panel member.

46. A method according to claim 45 comprising swinging the second panel member upwardly from the coplanar position to a second position in which it lies in a plane that lies at a rotational position beyond a substantially vertical plane.

47. A method according to any one of claims 42 to 46 comprising causing the second panel member to lie against the external wall of the building.

48. A method according to any one of claims 42 to 46 comprising providing the second panel member in spaced apart relation from the external wall.

49. A method according to any one of claims 42 to 48 comprising providing an insulation material between the panel portion and an upper portion of the external wall. 50. A method according to any one of claims 42 to 49 comprising at least partially enclosing by means of the first and second panel members an insulation material provided above the external wall.

51 . A method according to any one of claims 42 to 50 comprising attaching an insulation material to an underside of at least a portion of the panel portion.

52. A method according to claim 51 comprising attaching an insulation material to an underside of at least a portion of the panel portion between the rafters. 53. A kit of parts comprising a panel portion and instructions for implementing the method of any one of claims 42 to 52. A kit according to claim 53 further comprising at least one panel support member.

55. A roof structure, a building, an assembly, a method or a kit of parts substantially hereinbefore described with reference to FIG.'s 2 to 8.