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US2553227A - Composite sheathing board and method of making same - Google Patents

Composite sheathing board and method of making same Download PDF

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Publication number
US2553227A
US2553227A US624430A US62443045A US2553227A US 2553227 A US2553227 A US 2553227A US 624430 A US624430 A US 624430A US 62443045 A US62443045 A US 62443045A US 2553227 A US2553227 A US 2553227A
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wood
strip
strips
substitute
sheathing
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US624430A
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Wilton W Wesner
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
    • E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
    • E04F13/0864—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements composed of superposed elements which overlap each other and of which the flat outer surface includes an acute angle with the surface to cover
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
    • Y10T156/1092—All laminae planar and face to face
    • Y10T156/1093—All laminae planar and face to face with covering of discrete laminae with additional lamina
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24752—Laterally noncoextensive components

Definitions

  • the object of the invention is to provide improvements in sheathing, and more especially in a composite product composed of alternate strips of wood or wood-like material and some suitable cellular wood substitute, as hereinafter set forth.
  • Another and more specific object is to provide a composite plank or board, comprising relatively narrow strips of wood or woochlike material of suitable type, sufliciently spaced to provide for nailing thereto standard shingles and clapboards, while between each pair of such strips there is a Wider strip of a fibrous material, such as that made from corn husks or other waste substances and sold under the trade-name Celotex, though the invention is in no Wise limited to strips of this particular material, as there are already other types of so-called wallboard available, to which additional types will no doubt be added in the future.
  • Fig. 1 is an elevational view of a unit that comprises one embodiment of the invention, in which two wood strips are used with a single intervening strip of wood-substitute;
  • Fig. 2 is a vertical section of the same;
  • Fig. 3 is a section through a multi-sectional unit joined by shiplap;
  • Fig. 4 shows the same form with the wood and wood substitute strips united by staples;
  • Fig. 5 shows the same type of unit secured together with tarpaper or builders paper, or with one kind of paper on one side and another kind on the other side;
  • Fig. 6 is a vertical section showing several composite sheathing units assembled, as on the walls of a house or other building, and with overlapping shingles secured to them in conventional manner.
  • an intermediate strip l of manufactured plank or board is shown as being composed of fibrous material such as that derived from corn husks, sawdust and other waste, and which at the same time is preferably cellular for the resulting heat-insulating characteristics that such material contributes to the finished product.
  • the upper and lower edges its own lower edge is provided with a groove 9 for receiving the tongue of a lower unit beneath it.
  • the smallest composite unit comprises a single strip of wood and a single strip of wood-substitute, preferably though not necessarily firmly secured together as a single sheathing unit.
  • interconnecting means tongues and grooves have been referred to as the interconnecting means
  • tongues and grooves have been referred to as the interconnecting means
  • the interconnecting means it is also possible to use the Well known shiplap joints characterized by the flanges it and i l, in order to indicate that the invention is by no means limited in any way to the means by which the sections are united.
  • a composite unit comprising two spaced strips of wood and an intermediate strip of wood-substitute, which after being firmly united are covered upon one side with a sheet of builders paper l3 and upon the other side with a sheet of tarpaper 14.
  • both builders and tarpapers are shown in Fig. 5, both types of paper (or other desired type of sheets) need not be used simultaneously, but only one and that one upon either the inner or the outer surface of the unit,
  • the width of the composite unit may be within any feasible limits, but as shingles and clap boards have long been standardized, it is preferable to space the center of the wooden strips so as to best accommodate the accepted spacing at which such shingles l5. and clapboards are secured by nails Hi to ordinary sheathing, whatever that distance may be in various localities. For purposes of illustration, if the accepted dirtance between nails is determined to be twelve inches, and two-inch wood strips will accome modate such nails, even when applied somewhat irregularly, it will be found that the wood-substitute strip will have to be about ten inches wide, in order to properly space apart the centers of said wooden strips. However, this is a minor detail that might conceivably be altered ascondi tions vary.
  • intermediate strip of wood there are many substances that can be used, including various compositions of waste materials referred to hereinbefore, pressed fibrous materials, gypsum and the like, probably all of which possess varying degrees of insulation char-- acteristics, whether as to sound or heat, or both.
  • the exact type of material of which the wood-substitute strip is formed is of no material consequence, so far as the invention is concerned, this being left to the preferance of the manufacturer, or the consumer, or the availability of the various materials that it is possible to use for this purpose.
  • sheathing board and boardlike sheathing. unit is meant a unit, that can be employed in place of ordinary all-wood sheathing lumber, when used asv a foundation to which surface finishing materials such as. clapboards and shingles are nailed, screwed, or otherwise secured, and which is characterized by a relatively wide strip of cellular wood substitute, a relatively much narrower wooden nailing strip secured to one of the longer edges of said first strip, or a pair of such narrower wooden strips secured to the oppositely directed longer edges thereof, and a relatively thin sheet of non-me,- tallic, that is readily pierced by nails and screws,
  • An inherently complete and self-contained boardlike sheathing unit comprising the com.- bination of a wooden nail-receiving strip and a strip of cellular wood substitute secured together along their longer edges only, with a flexible paper sheet adhesively secured to one side of said wooden and wood-substitute strips,
  • An inherently complete and self-contained boardlike sheathing unit comprising the combination of a pair of woolen nail-receivable strips and an interve ing strip of cellular wood,- substitute unitaril secured together along their longer edges only, with a flexible fibrous sheet adhesively secured to one side of said wooden and wood-substitute strips.
  • An inherently complete and self-contained boardlike sheathing unit comprising the combination of a nail-receivable strip and a strip of cellular wood-substitute secured together along their longer edges only, with a flexible fibrous sheet adhesively secured to one side of said nail-receivable and wood-substitute strips.
  • An inherently complete and self-contained boardlike sheathing unit comprising the combination of a nail-receivable strip and a strip of cellular wood-substitute secured together along their longer edges only, with a flexible heat-responsive resinous sheet adhesively secured to one side of said nail-receivable and wood-substitute strips.
  • An inherently complete and self-contained boardlike sheathing unit comprising the combination of a, nail-receivable strip and a strip of cellular wood-substitute secured together along their longer edges only, with a flexible tar-impregnated sheet adhesively secured to one side of said nail-receivable and wood-substitute strips.
  • An inherently complete and self-contained boardlike sheathing unit comprising the com-.- bination of a pair of nail-receivable strips. and an intervening strip of cellular wood-substitute unitarily secured together along their longer edges only, with a flexible fibrous sheet adhesively secured to, one side of said nail-receivable and wood-substitute strips.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)

Description

May 15, 1951 w. w. WESNER 2,553,227
COMPOSITE SHEATHING BOARD AND METHOD or MAKING SAME: Filed Oct. 25, 1945 2 Sheets-Sheet 1 zzzzwm J. Invenfor; W'ifon W. Ws'ner;
May 15, 1951 w. w. WESNER COMPOSITE SHEATHING BOARD AND METHOD OF MAKING SAME 2 Sheets-Sheet 2 Filed Oct. 25, 1945 A x m 152 van :0 r, 771 17 #021 W Wsn e2;
Maw .Affa r27 g5.
J 2 v l ll/l/I/ lllllll w. -$W w 6 6 .6 2
Patented May 15, 1951 COMPOSITE SHEATHING BOARD AND METHOD OF MAKING SAME Wilton W. Wesner, Rancocas, N. J.
Application October 25, 1945, Serial No. 624,430
10 Claims.
The object of the invention is to provide improvements in sheathing, and more especially in a composite product composed of alternate strips of wood or wood-like material and some suitable cellular wood substitute, as hereinafter set forth.
For many years the cost of wood has soared, so that today even the relatively low grade timber, usually of twelve inches width, that has long been satisfactory for sheathing which is commonly covered with protective shingles, clapboards, or the like, has increased so in cost that it has become a recognized fact that some means must be found, if possible, to provide a less expensive substitute, that will be at least as heatinsulating as when composed entirely of wood, that will provide the same degree of nail-gripping tendency as wood, and that can be assembled at the factory and shipped as a unit, ready for cutting and installation as easily as ordinary lumber.
Another and more specific object is to provide a composite plank or board, comprising relatively narrow strips of wood or woochlike material of suitable type, sufliciently spaced to provide for nailing thereto standard shingles and clapboards, while between each pair of such strips there is a Wider strip of a fibrous material, such as that made from corn husks or other waste substances and sold under the trade-name Celotex, though the invention is in no Wise limited to strips of this particular material, as there are already other types of so-called wallboard available, to which additional types will no doubt be added in the future.
With the broad object of the invention thus briefly stated, the invention comprises further details of construction, which are hereinafter fully brought out in the following description, when read in conjunction with the accompanying drawings, in which Fig. 1 is an elevational view of a unit that comprises one embodiment of the invention, in which two wood strips are used with a single intervening strip of wood-substitute; Fig. 2 is a vertical section of the same; Fig. 3 is a section through a multi-sectional unit joined by shiplap; Fig. 4 shows the same form with the wood and wood substitute strips united by staples; Fig. 5 shows the same type of unit secured together with tarpaper or builders paper, or with one kind of paper on one side and another kind on the other side; and Fig. 6 is a vertical section showing several composite sheathing units assembled, as on the walls of a house or other building, and with overlapping shingles secured to them in conventional manner.
Referring to the drawings, an intermediate strip l of manufactured plank or board is shown as being composed of fibrous material such as that derived from corn husks, sawdust and other waste, and which at the same time is preferably cellular for the resulting heat-insulating characteristics that such material contributes to the finished product. The upper and lower edges its own lower edge is provided with a groove 9 for receiving the tongue of a lower unit beneath it. However, while for the sake of clarity two wooden strips are shown as being secured to the single intermediate wood-substitute strip, it is to be understood that in practice only a single such wooden strip is best secured to the single inter: mediate strip, so that when assembling the lower edge of the intermediate strip directly engages the upper edge of the wooden strip of a dual unit beneath it, while the single upper wooden strip in such case directly engages the under edge of the so-called intermediate or wood-substitute strip of a unit above it. Obviously, therefore, the smallest composite unit comprises a single strip of wood and a single strip of wood-substitute, preferably though not necessarily firmly secured together as a single sheathing unit. Also, whereas tongues and grooves have been referred to as the interconnecting means, it is also possible to use the Well known shiplap joints characterized by the flanges it and i l, in order to indicate that the invention is by no means limited in any way to the means by which the sections are united.
In practice, it may be found by some manufacturers more desirable to positively secure the two or more sections of each unit together, in which case staples [2 may be employed, such as those shown in Fig. 4. On the other hand, as it is customary in erecting buildings and homes of the more expensive kind to use builders paper or the like in order to still further lessen the amount of air that would otherwise seep through the wall, both inwardly and outwardly, the invention contemplates the assembly of such a medium at the factory as a unitary part of the finished unit. Also in damp climates or when for some particular reason the interior of a building is intended to be kept drier than usual, it may be desirable to use a tarpaper as a part of the unit, upon one or both sides thereof. In Fig. there is shown a composite unit comprising two spaced strips of wood and an intermediate strip of wood-substitute, which after being firmly united are covered upon one side with a sheet of builders paper l3 and upon the other side with a sheet of tarpaper 14. However, it is to be further understood that whereas both builders and tarpapers are shown in Fig. 5, both types of paper (or other desired type of sheets) need not be used simultaneously, but only one and that one upon either the inner or the outer surface of the unit,
The width of the composite unit may be within any feasible limits, but as shingles and clap boards have long been standardized, it is preferable to space the center of the wooden strips so as to best accommodate the accepted spacing at which such shingles l5. and clapboards are secured by nails Hi to ordinary sheathing, whatever that distance may be in various localities. For purposes of illustration, if the accepted dirtance between nails is determined to be twelve inches, and two-inch wood strips will accome modate such nails, even when applied somewhat irregularly, it will be found that the wood-substitute strip will have to be about ten inches wide, in order to properly space apart the centers of said wooden strips. However, this is a minor detail that might conceivably be altered ascondi tions vary.
For the so-called intermediate strip of wood substitute there are many substances that can be used, including various compositions of waste materials referred to hereinbefore, pressed fibrous materials, gypsum and the like, probably all of which possess varying degrees of insulation char-- acteristics, whether as to sound or heat, or both. Thus, the exact type of material of which the wood-substitute strip is formed is of no material consequence, so far as the invention is concerned, this being left to the preferance of the manufacturer, or the consumer, or the availability of the various materials that it is possible to use for this purpose.
When tarpaper is used upon one or both. sides of the unit, or when some other type of sheet material impregnated with a wateror moisturerepellant substance is employed, and especially when the material with which the sheet is impregnated is heat responsive, it has been found thatv the impregnated sheet is. best secured to the two united strips by means of heat and pressure, and instead of tar-impregnated paper a thin sheet of thermoplastic material may be used, or a sheet of fibrous material such as a porous form of paper impregnated with a suitable heat-responsive plastic, or with a suitable thermosetting material, whichever is best suited to the requirements of a particular installation.
By the terms sheathing board and boardlike sheathing. unit is meant a unit, that can be employed in place of ordinary all-wood sheathing lumber, when used asv a foundation to which surface finishing materials such as. clapboards and shingles are nailed, screwed, or otherwise secured, and which is characterized by a relatively wide strip of cellular wood substitute, a relatively much narrower wooden nailing strip secured to one of the longer edges of said first strip, or a pair of such narrower wooden strips secured to the oppositely directed longer edges thereof, and a relatively thin sheet of non-me,- tallic, that is readily pierced by nails and screws,
4 adhesively secured to and upon one side of said strips.
Having thus described my invention, what I claim and desire to protect by Letters Patent of the United States is:
1. The method of producing an inherently complete and self-contained boardlike sheathing unit that can be employed in lieu of ordinary all-wood sheathing lumber as a foundation to which clapboards and shingles are secured, which consists in unitarily joining an edge of a wooden nail-receivable strip to one of the longer edges of a strip of cellular wood substitute, and then adhesively securing a flexible fibrous sheet to one side of said wood substitute and nail-receivable strips.
2. The method of producing an inherently complete and self-contained boardlike sheathing unit that can be employed in lieu of ordinary all-wood sheathing lumber as a foundation to which clapboards and shingles are secured, whichv consists in unitarily joining an edge of a wooden nail-receivable strip to each of the longer edges only of a strip of cellular wood substitute, and then adhesively securing a heat-responsive resinous sheet to one side of the combined wood-substitute and nail-receivable strips.
3. An inherently complete and self-contained boardlike sheathing unit, comprising the com.- bination of a wooden nail-receiving strip and a strip of cellular wood substitute secured together along their longer edges only, with a flexible paper sheet adhesively secured to one side of said wooden and wood-substitute strips,
4. An inherently complete and self-contained boardlike sheathing unit, comprising the combination of a pair of woolen nail-receivable strips and an interve ing strip of cellular wood,- substitute unitaril secured together along their longer edges only, with a flexible fibrous sheet adhesively secured to one side of said wooden and wood-substitute strips.
5. An inherently complete and self-contained boardlike sheathing unit, comprising the combination of a nail-receivable strip and a strip of cellular wood-substitute secured together along their longer edges only, with a flexible fibrous sheet adhesively secured to one side of said nail-receivable and wood-substitute strips.
6. An inherently complete and self-contained boardlike sheathing unit, comprising the combination of a nail-receivable strip and a strip of cellular wood-substitute secured together along their longer edges only, with a flexible heat-responsive resinous sheet adhesively secured to one side of said nail-receivable and wood-substitute strips.
7. An inherently complete and self-contained boardlike sheathing unit, comprising the combination of a, nail-receivable strip and a strip of cellular wood-substitute secured together along their longer edges only, with a flexible tar-impregnated sheet adhesively secured to one side of said nail-receivable and wood-substitute strips.
8. An inherently complete and self-contained boardlike sheathing unit, comprising the com-.- bination of a pair of nail-receivable strips. and an intervening strip of cellular wood-substitute unitarily secured together along their longer edges only, with a flexible fibrous sheet adhesively secured to, one side of said nail-receivable and wood-substitute strips.
9. An inherently complete and self-contained boardlike sheathing, unit, comprising the com- REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number 15 Number Name Date Schumach'er Nov. 2, 1920 Raynes July 2, 1929 Auld Jan. 20, 1931 Lewis Nov. 1, 1932 Loetscher May 30, 1933 Adams Aug. 12, 1941 Sweet Jan. 27, 1942 Miller Feb. 29, 1944 Kahr Apr. 23, 1946 Pierson Dec. 17, 1946 FOREIGN PATENTS Country Date Great Britain 1929 Sweden 1934

Claims (2)

1. THE METHOD OF PRODUCING AN INHERENTLY COMPLETE AND SELF-CONTAINED BOARDLIKE SHEATHING UNIT THAT CAN BE EMPOLYED IN LIEU OF ORDINARY ALL-WOOD SHEATHING LUMBER AS A FOUNDATION TO WHICH CLAPBOARDS AND SHINGLES ARE SECURED, WHICH CONSISTS IN UNITARILY JOINING AN EDGE OF A WOODEN NAIL-RECEIVABLE STRIP TO ONE OF THE LONGER EDGES OF A STRIP OF CELLULAR WOOD SUBSTITUTE, AND THEN ADHESIVELY SECURING A FLEXIBLE FIBROUS SHEET TO ONE SIDE OF SAID WOOD SUBSTITUTE AND NAIL-RECEIVABLE STRIPS.
4. AN INHERENTLY COMPLETE AND SELF-CONTAINED BOARDLIKE SHEATHING UNIT, COMPRISING THE COMBINATION OF A PAIR OF WOOLEN NAIL-RECEIVABLE STRIPS AND AN INTERVENING STRIP OF CELLULAR WOODSUBSTITUTE UNITARILY SECURED TOGETHER ALONG THEIR LONGER EDGES ONLY, WITH A FLEXIBLE FIBROUS SHEETS
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156599A (en) * 1960-09-07 1964-11-10 Roland R Keesee Method and apparatus for manufacturing cardboard molding
US3401495A (en) * 1965-04-05 1968-09-17 Nat Gypsum Co Composite floor-ceiling element
US4303707A (en) * 1977-08-22 1981-12-01 John Prior Building component and method of making the same
US4343669A (en) * 1977-08-22 1982-08-10 Prior John C Building component and method of making the same
US4689103A (en) * 1985-11-18 1987-08-25 E. I. Du Pont De Nemours And Company Method of manufacturing injection molded printed circuit boards in a common planar array
US4917747A (en) * 1989-02-24 1990-04-17 The Boeing Company Method of making crushed core molded panels
US4961802A (en) * 1987-11-10 1990-10-09 Matsushita Electric Industrial Co., Ltd. Method of manufacturing a lens array for reading information
US5367844A (en) * 1993-05-10 1994-11-29 La Force Hardware & Manufacturing Co. Panel construction which includes slats of recycled plastic
US20080034706A1 (en) * 2004-09-06 2008-02-14 Hermann Preiss Construction Module

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357350A (en) * 1920-03-17 1920-11-02 Schumacher John Wall-tape
GB305694A (en) * 1927-11-08 1929-02-08 British Celanese New or improved composite material, and articles made with same
US1719726A (en) * 1926-08-26 1929-07-02 Atlantic Gypsum Products Compa Wall board
US1789288A (en) * 1929-03-29 1931-01-20 Frederick H Auld Manufacturing material for airplane uses
US1885364A (en) * 1929-10-28 1932-11-01 Met L Wood Corp Insulating material and method of making the same
US1911374A (en) * 1930-06-12 1933-05-30 Emil C Loetscher Veneered door and like product
US2252539A (en) * 1938-07-13 1941-08-12 Celotex Corp Method of making corner members
US2271355A (en) * 1941-07-16 1942-01-27 Carroll V Sweet Panel
US2342682A (en) * 1940-10-18 1944-02-29 Masonite Corp Composite wall panel
US2399124A (en) * 1941-02-07 1946-04-23 Kahr Gustaf Method of manufacturing composite boards
US2412693A (en) * 1940-01-26 1946-12-17 Gordon G Pierson Method and tape for joining plies

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357350A (en) * 1920-03-17 1920-11-02 Schumacher John Wall-tape
US1719726A (en) * 1926-08-26 1929-07-02 Atlantic Gypsum Products Compa Wall board
GB305694A (en) * 1927-11-08 1929-02-08 British Celanese New or improved composite material, and articles made with same
US1789288A (en) * 1929-03-29 1931-01-20 Frederick H Auld Manufacturing material for airplane uses
US1885364A (en) * 1929-10-28 1932-11-01 Met L Wood Corp Insulating material and method of making the same
US1911374A (en) * 1930-06-12 1933-05-30 Emil C Loetscher Veneered door and like product
US2252539A (en) * 1938-07-13 1941-08-12 Celotex Corp Method of making corner members
US2412693A (en) * 1940-01-26 1946-12-17 Gordon G Pierson Method and tape for joining plies
US2342682A (en) * 1940-10-18 1944-02-29 Masonite Corp Composite wall panel
US2399124A (en) * 1941-02-07 1946-04-23 Kahr Gustaf Method of manufacturing composite boards
US2271355A (en) * 1941-07-16 1942-01-27 Carroll V Sweet Panel

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156599A (en) * 1960-09-07 1964-11-10 Roland R Keesee Method and apparatus for manufacturing cardboard molding
US3401495A (en) * 1965-04-05 1968-09-17 Nat Gypsum Co Composite floor-ceiling element
US4303707A (en) * 1977-08-22 1981-12-01 John Prior Building component and method of making the same
US4343669A (en) * 1977-08-22 1982-08-10 Prior John C Building component and method of making the same
US4689103A (en) * 1985-11-18 1987-08-25 E. I. Du Pont De Nemours And Company Method of manufacturing injection molded printed circuit boards in a common planar array
US4961802A (en) * 1987-11-10 1990-10-09 Matsushita Electric Industrial Co., Ltd. Method of manufacturing a lens array for reading information
US4917747A (en) * 1989-02-24 1990-04-17 The Boeing Company Method of making crushed core molded panels
US5367844A (en) * 1993-05-10 1994-11-29 La Force Hardware & Manufacturing Co. Panel construction which includes slats of recycled plastic
US20080034706A1 (en) * 2004-09-06 2008-02-14 Hermann Preiss Construction Module
US7971401B2 (en) * 2004-09-06 2011-07-05 Hermann Preiss Construction module

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