US1928097A - Flashing - Google Patents

Description

p 1933- c. A. I-I'RITCH 1,928,097

FLASHING Filed Jan. 25, 1930 Patented Sept. 26,1933

UNITED STATES PATENT OFFICE FLASHING Application January 25,

1 Claim.

The principal objects of the invention are to overcome the difiiculties met with in maintaining weather-tight contact between the covering of the roof area and the coping Walls, and to provide a flashing which will allow of the maximum expansion and contraction of the roofing materials without detrimentally affecting the seal of the flashing.

The principal features of the invention consist in the novel arrangement of an angle strip in the angle of juncture between the roof and the wall for supporting the edges of the roof covering in a turned-up position, and in the arrangement of a plurality of overlapping strips of asphalted or tarred felt secured to the wall above the turned- 7 up edges of the roof covering and overlapping same in a weather tight joint.

In the accompanying drawing, Figure 1 is a diagrammatic sectional view of a'rooi structure showing the arrangement of the improved flashing thereon.

Figure 2 is a view similar to Figure 1- showing the flashing applied to a concrete structure.

In carrying this invention into efiect, the main portion A of the roof iscovered over with the usual covering 1 of a plurality of layers of asphalted or tarred felt.

Before placing the felt cover 1 in position, an angle strip 2 of wood, concrete or other suitable material is placed in the corner where the roof A meets the wall 3 and the covering 1 is supported by and nailed to the top of these corner strips when of wood in an upwardly inclined position and terminates against the face of the wall, said corner strips when of concrete and the wall face being previously primed with a suitable coating of asphalt or tar.

A nailing strip 4 is embedded in the wall 3 above the angle strip 2 where the wall is of concrete or such a strip may be embedded in a brick wall'if desired and a plurality of layers of asphalted or tarred felt 5 are placed against the vertical wall face to extend above the corner strip and beyond the nailing strip where such is used.

These layers of asphalted or tarred felt in strips extending longitudinally are applied over alternated coatings of asphalt or tar 6 and the upper strip 7 preferably extends over th'eroof top A beyond the edges of the under strips. Thus the. roofing material overlying the actual covering which is preferably and usually of a plastic or f semi-plastic material will form a seal with the terminal ends of the superposed under layers and the upper strip 7 will overlie the thus formed seal and extend a substantial distance therebeyond so 7 that a very effective type of stepped seal is pro- 3 duced which will be very eflicient in service The vertical side portions 8 of the strips 5 are nailed to the wood strips embedded in the concrete wall or into the mortar of the bricks with 1930. Serial No. 423,483

flat-headed nails placed closely together and over the upper edge or this flexible composite Weathering strip is placed a metal flashing strip 9, th upper edge of which is embedded in a suitable chase formed in thewall structure.

A heavy coating 1' of tar or asphalt is placed over the main roof covering 1 to overlap and'seal the edges of the side strips overlapping the edges of the main roof covering.-

. It will-be readily seen that with a flashing such as described the upturned edges of the main roof covering will prevent water flowing directly to the.

edges and it will also be obvious that the main body of the roof covering may expand or contract to a very considerable extent without pulling the extreme edges of the roof covering away from the wall. 7

Considerable latitude of movement is thus provided but the weathering is completed by the overlying plurality of asphalted or tarred strips which are secured to the vertical side of the wall and then sealed to the top of the main roof coverings This form of flashing joint may be applied to any form of asphalt or tar and gravel built-up roof, whether applied cold or in any other form and the use of such will undoubtedly very greatly extend the life of the roof which in ordinary constructions first fails at the edges.

What I claim as my invention is:

A flashing for built-up roof covers, comprising in combination, means for supporting the edges of the roof covering with an upward slope, flexible means presenting substantially right-angularly related edge portions overlapping respectively the wall and said roof covering and secured thereto and having the intermediate portion free and supported by direct contact with the supported upwardly sloping edge portions of the roof cover ing and being free to flex with said upwardly sloping portions on the contraction and expansion of said roof covering, said flexible means comprising a plurality of superposed layers of tarred felt or fibrous material, the roof-overlapping endsoi I the under layers terminating in substantial alignment with each other, and a roofing material over-'- lying the roof covering and forming a seal with stepped seal is formed between the roofing and the co -operating roof-overlapping ends of said superposed layers, f I

- CHARLES A. FRITCH.

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