US20060236641A1 - Polymeric foam and scrim sheathings - Google Patents
Polymeric foam and scrim sheathings Download PDFInfo
- Publication number
- US20060236641A1 US20060236641A1 US11/472,076 US47207606A US2006236641A1 US 20060236641 A1 US20060236641 A1 US 20060236641A1 US 47207606 A US47207606 A US 47207606A US 2006236641 A1 US2006236641 A1 US 2006236641A1
- Authority
- US
- United States
- Prior art keywords
- scrim
- layer
- sheathing
- count number
- polymeric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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Images
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2419/00—Buildings or parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2459/00—Nets, e.g. camouflage nets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/10—Removing layers, or parts of layers, mechanically or chemically
- B32B38/105—Removing layers, or parts of layers, mechanically or chemically on edges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/14—Printing or colouring
- B32B38/145—Printing
Abstract
A sheathing adapted to be fastened to at least one wall supporting structure comprises at least two layers. The first layer comprises a polymeric foam layer. The second layer comprises a polymeric scrim and is located adjacent to the first layer. The second layer has a first portion and a second portion. The second portion is located near the periphery of the polymeric scrim layer. The first portion has a first machine direction (MD) scrim count number and a first transverse direction (TD) scrim count number, and the second portion has a second MD scrim count number and a second TD scrim count number. At least one of the second MD scrim count number and the second TD scrim count number is greater than the respective first MD scrim count number or the first TD scrim count number so as to inhibit failure of the scrim.
Description
- The present application is a continuation of U.S. patent application Ser. No. 10/782,480, filed on Feb. 19, 2004, which is a continuation of U.S. patent application Ser. No. 09/660,649, filed on Sep. 13, 2000, which is a Continuation-in-Part of U.S. patent application Ser. No. 09/421,031, filed on Oct. 20, 1999, now U.S. Pat. No. 6,536,176 B1. These related applications are hereby incorporated by reference in their entirety.
- The present invention relates generally to sheathings that are used in structures and, more particularly, to polymeric foam sheathing materials that are used in prefabricated housing, site built housing, and remodeling.
- There are different commercial sheathings that are used in the construction of buildings. Sheathings include materials that span the frame supports of buildings. Some of the commercial products that have been used as sheathing include thin composite laminations, fiberboard, orientated strand board (OSB) and plywood. Some of these products provide structural strength, durability and/or rigidity. These products, however, have disadvantages such as being heavy and difficult to install, providing little insulation and/or having poor moisture resistance.
- There are other commercial products that are available as sheathing. For example, polyisocyanurate foam, extruded polystyrene foam, and molded expanded polystyrene (EPS) foam. These existing foamed materials generally have advantages such as increased insulation and easier handling. These existing foamed materials, however, have disadvantages such as their lack of strength as measured by wind resistance. This is shown, for example, by their failures to withstand 100 miles per hour winds when installed. Lack of wind resistance may cause problems such as fracturing, cracking and/or edge pull out of the sheathing from the fasteners. During the pulling of the edge of the material, the fastener generally remains, but the sheathing is pulled away.
- Existing foam sheathing is still susceptible to damage at the building site prior to installation. This problem is further evident when, for example, delays occur in the installation and/or the installation occurs in extreme weather conditions. One common example of damage that may occur is when a piece breaks off from a remainder of the sheathing during the process of installation or by vandalism after installation at the building site before being covered with an exterior facing such as siding, brick, or stucco.
- Accordingly, a need exists for a sheathing material for use in prefabricated housing, site built housing, and remodeling that overcomes the above-noted shortcomings associated with existing sheathing.
- According to one embodiment of the present invention, a sheathing adapted to be fastened to at least one wall supporting structure comprises at least two layers. The first layer comprises a polymeric foam layer. The second layer comprises a polymeric scrim and is located adjacent to the first layer. The second layer has a first scrim portion and a second portion. The second portion is located near the periphery of the polymeric scrim layer. The first portion has a first machine direction (MD) scrim count number and a first transverse direction (TD) scrim count number, and the second portion has a second MD scrim count number and a second TD scrim count number. At least one of the second MD scrim count number and the second TD scrim count number is greater than the respective first MD scrim count number or the first TD scrim count number so as to inhibit failure of the scrim.
- According to another embodiment, a sheathing adapted to be fastened to at least one wall supporting structure comprises at least two layers. The first layer comprises a polymeric foam layer and is located adjacent the second layer. The second layer comprises a polymeric scrim having a uniform scrim count number. The polymeric scrim has a machine direction (MD) scrim count number which is least 18 and a transverse direction (TD) scrim count number which is at least 4 so as to inhibit failure of the scrim.
- According to another embodiment of the present invention, a sheathing adapted to be fastened to at least one wall supporting structure comprises at least three layers. The first layer comprises a polymeric foam layer. The second layer comprises a polymeric scrim and has a first portion and a second portion. The second portion is located near the periphery of the polymeric scrim layer. The first portion has a first machine direction (MD) scrim count number and a first transverse direction (TD) scrim count number, and the second portion has a second MD scrim count number and a second TD scrim count number. At least one of the second MD scrim count number and the second TD scrim count number is greater than the respective first MD scrim count number or the first TD scrim count number so as to inhibit failure of the scrim. The third layer comprises an impact polystyrene and is located between the first and the second layers.
- According to one method of the present invention, a sheathing is provided that comprises at least two layers. The first layer comprises a polymeric foam layer. The second layer comprises a polymeric scrim and is located adjacent to the first layer. The second layer has a first portion and a second portion. The second portion is located near the periphery of the polymeric scrim layer. The first portion has a first machine direction (MD) scrim count number and a first transverse direction (TD) scrim count number, and the second portion has a second MD scrim count number and a second TD scrim count number. At least one of the second MD scrim count number and the second TD scrim count number is greater than the respective first MD scrim count number or the first TD scrim count number so as to inhibit failure of the scrim. The sheathing is installed to a wall supporting structure.
-
FIG. 1 shows a side view of a two-layer sheathing according to one embodiment of the present invention. -
FIGS. 2 a and 2 b show front views of the second layer of the sheathing according to two embodiments of the present invention. -
FIG. 3 shows a side view of a three-layer sheathing according to another embodiment of the present invention. -
FIG. 4 shows a side view of a four-layer sheathing according to another embodiment of the present invention. -
FIG. 5 shows a side view of a five-layer sheathing according to yet another embodiment of the present invention. -
FIG. 6 shows a side view of a seven-layer sheathing according to a further embodiment of the present invention. -
FIG. 7 shows a cut-away perspective view of a five-layer sheathing fastened to a wall supporting structure according to one embodiment of the present invention using the second layer embodiment depicted inFIG. 2 a. -
FIG. 8 shows a schematic flow diagram of an overall sequence of operations according to one process involved in the manufacture of a three-layer sheathing such as that shown inFIG. 3 . - While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that it is not intended to limit the invention to the particular forms disclosed but, on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
- Turning now to the drawings and referring initially to
FIG. 1 , a two-layer sheathing 10 is shown according to one embodiment of the present invention. The sheathings of the present invention, includingsheathing 10, are adapted to be fastened to a wall supporting structure. On a building, sheathings are typically covered by an exterior facing such as siding, brick or stucco. Thesheathing 10 ofFIG. 1 comprises apolymeric scrim layer 12 and apolymeric foam layer 14. Thepolymeric scrim layer 12 of the present invention provides additional strength and durability to thepolymeric foam layer 14. Polymeric Scrim Layer Thepolymeric scrim layer 12 may be made of woven material or non-woven material. Woven material is generally defined as long fibers that are intertwined to produce a material. Non-woven material is generally defined as randomly joined fibers that are bonded or pressed together by adhesive or other means. The randomly joined fibers that form non-woven material are typically shorter than those used in forming woven material. The woven material is generally preferred because it provides an excellent strength to weight ratio that is desirable in wind-resistant applications. - One type of woven scrim that may be used in
polymeric scrim layer 12 is a scrim that runs in the machine direction (MD) and the weft or transverse direction (TD). For example, a scrim having a scrim count of 28×4 indicates that the scrim has 28 cords, filaments, or strands per inch in the machine direction and 4 cords, filaments, or strands per inch in the transverse direction. A scrim having cords that run in the machine direction and the weft or transverse direction is commonly referred to as a cross-woven scrim. This type of woven scrim may be the type that is commonly used in applications such as carpet backing. -
FIGS. 2 a and 2 b depict embodiments of respective polymeric scrim layers 112, 212 according to the present invention. As depicted inFIG. 2 a, thepolymeric scrim layer 112 has afirst portion 102 and asecond portion 104. Thefirst portion 102 is located in the central area of thepolymeric scrim layer 112 while thesecond portion 104 is located near the periphery of thepolymeric scrim layer 112. Thesecond portion 104 extends from the periphery of thepolymeric scrim layer 112 inwardly toward the central portion of thepolymeric scrim layer 112. - The
first portion 102 has a first machine direction (MD) scrim count number running in themachine direction 108 and a first transverse direction (TD) scrim count number running in thetransverse direction 110. Similarly, thesecond portion 104 has a second MD scrim count number running in themachine direction 108 and a second TD scrim count number running in thetransverse direction 110. At least one of the second MD scrim count number and the second TD scrim count number is greater than the respective first MD scrim count number or the first TD scrim count number. By increasing the scrim count at the periphery of thepolymeric scrim layer 112, the periphery of thepolymeric scrim layer 112 is reinforced and inhibits the scrim from unraveling. - As depicted in
FIG. 2 a, thepolymeric scrim layer 112 may also include athird portion 106. Thethird portion 106 is located near the periphery of thepolymeric scrim layer 112 opposite thesecond portion 104. Thethird portion 106 extends from the periphery of thepolymeric scrim layer 112 inwardly toward the central portion of thepolymeric scrim layer 112. Thethird portion 106 has a third MD scrim count number running in themachine direction 108 and a third TD scrim count number running in thetransverse direction 110. At least one of the third MD scrim count number and the third TD scrim count number is greater than the respective first MD scrim count number or the first TD scrim count number. Optionally, the second and third MD scrim count numbers are the same, and the second and third TD scrim count numbers are the same. - As depicted in
FIGS. 2 a and 2 b, the second and third MD scrim count numbers vary. The MD scrim count number, however, can be varied based upon the desired use of the sheathing and the cost.FIG. 2 a depicts an embodiment where the second MD scrim count number is the same at the third MD scrim count number and the second and third MD scrim count numbers are at least two times the first MD scrim count number. The second and third MD scrim count numbers can range from at least two times, at least four times, and to at least six times the first MD scrim count number. -
FIG. 2 b depicts another embodiment of thepolymeric scrim layer 212 according to the present invention.Polymeric scrim layer 212 has afirst portion 202, asecond portion 204 and athird portion 206. Thefirst portion 202 is located in the central area of thepolymeric scrim layer 212. The second andthird portions polymeric scrim layer 212 on opposing sides. Thefirst portion 202 has a first MD scrim count number in themachine direction 208 and a first TD scrim count number in thetransverse direction 210. Thesecond portion 204 has a second MD scrim count number in themachine direction 208 and a second TD scrim count number in thetransverse direction 210. Thethird portion 206 has a third MD scrim count number in themachine direction 208 and a third TD scrim count number in thetransverse direction 210.FIG. 2 b depicts an embodiment where the second and third MD scrim count numbers are the same and the second and third MD scrim count numbers are at least six times the first MD scrim count number. - The distance that the second and third portions extend from the periphery of the
polymeric scrim layer polymeric scrim layer polymeric scrim layer - The
second portion polymeric scrim layer polymeric scrim layer third portion polymeric scrim layer second portion - It is contemplated that various scrim counts may be used in forming the polymeric scrim layer having an increased scrim count at the periphery. Examples of suitable scrim counts that may be used in the central portion of the polymeric scrim layer having an increased scrim count at the periphery include 7×4, 8×6, 9×4, 21×4, 24×4, 28×4, 18×6, and 21×6. It is contemplated that the scrim count number at the periphery of the polymeric layer will be greater than the scrim count number in the central portion and that the selection of the scrim count number at the periphery will vary based on the desired use of the sheathing and the cost.
- According to another embodiment, the polymeric scrim layer has a uniform scrim count number so as to inhibit failure of the scrim. According to this embodiment, the polymeric scrim layer has an MD scrim count number which is least 18 and a TD scrim count number which is at least 4. Examples of suitable scrim counts that may be used where the polymeric scrim layer has a uniform scrim count number include 21×4, 24×4, 28×4, 18×6, and 21×6.
- The
polymeric scrim layer 12 may be made of materials such as polyolefins, polyesters and nylons. Polyolefins that may be used in thepolymeric scrim layer 12 include polypropylenes or polyethylenes. The term “polypropylene” as used herein includes polymers of propylene or polymerizing propylene with other aliphatic polyolefins, such as ethylene, 1-butene, 1-pentene, 3-methyl-1-butene, 4-methyl-1-pentene, 4-methyl-1-hexene, 5-methyl-1-hexene and mixtures thereof. Polypropylene not only includes homopolymers of propylene, but also propylene copolymers comprised of at least 50 mole percent (preferably at least 70 mole percent) of a propylene unit and a minor proportion of a monomer copolymerizable with propylene and blends of at least 50 percent by weight of the propylene homopolymer with another polymer. - The term “polyethylene” as used herein includes low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), metallocene-catalyzed linear low density polyethylene (mLLDPE) and combinations thereof.
- LDPE is generally defined as an ethylenic polymer having a specific gravity of from about 910 to about 925 kg/m3. MDPE is generally defined as an ethylenic polymer having a specific gravity between the LDPEs and the HDPEs (i.e., from about 925 to about 940 kg/m3). The high density polyethylene (HDPE) of the present invention has a specific gravity of from about 940 to about 970 kg/m3. The term polyethylene as used herein includes homopolymers of ethylene and copolymers comprised of at least 50 mole percent of a ethylene unit (preferably at least 70 mole percent) and a minor (i.e., less than 50%) proportion of a monomer copolymerizable with the ethylene unit. The term LDPE as used herein also includes physical blends of two or more different homopolymers that are classified as LDPEs. Similarly, the term MDPE and HDPE may also include blends of two or more different homopolymers classified as MDPEs and HDPEs, respectively.
- The VLDPE resins have densities ranging from about 880 to about 912 kg/m3, more commonly from about 890 to about 910 kg/m3, and melt indices of from about 0.5 to about 5 g/10 min., and from about 1 to about 3 g/10 min.
- The LLDPE of the present invention generally has from about 1 to about 20, preferably from about 1 to about 10 weight percent of said higher alpha olefin monomer copolymerized therein. In addition, the alpha olefin monomer employed in the ethylenic copolymer may be selected from the group consisting of 1-butene, 3-methyl-1-butene, 3 methyl-1-pentene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-hexene, 1-octene and 1-decene. The LLDPE resins that may be used in the present invention have densities ranging from about 890 to about 940 kg/m3, more commonly from about 900 to about 930 kg/m3, and a melt index (I2) of from about 1 to about 10 g/10 min. as determined by ASTM D1238.
- The metallocene-catalyzed polyethylene (mLLDPE) is a polymer having a low polydispersity. The low polydispersity polymer may be prepared from a partially crystalline polyethylene resin that is a polymer prepared with ethylene and at least one alpha olefin monomer, e.g., a copolymer or terpolymer. The alpha olefin monomer generally has from about 3 to about 12 carbon atoms, preferably from about 4 to about 10 carbon atoms, and more preferably from about 6 to about 8 carbon atoms. The alpha olefin comonomer content is generally below about 30 weight percent, preferably below about 20 weight percent, and more preferably from about 1 to about 15 weight percent. Exemplary comonomers include propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-l-pentene, 4-methyl-1-pentene, 1-octene, 1-decene, and 1-dodecene.
- The low polydispersity polymer has a density of from about 880 to about 940 kg/m3. The polydispersity polymer generally have a molecular weight distribution, or polydispersity, (Mw/Mn, “MWD”) within the range of from about 1 to about 4, and more typically from about 2 to about 3. The melt flow ratio (MFR) of these polymers, defined as I20/I2 and as determined in accordance to ASTM D1238, is generally from about 12 to about 22 and typically from about 14 to about 20. The melt index (MI), defined as the I2 value, should be in the range of from about 0.5 to about 10 g/10 min. and typically from about 1 to about 5 g/10 min. as determined by ASTM D1238.
- An example of a “polyester” includes a polyester resin which is a polycondensation product of a dicarboxylic acid with a dihydroxy alcohol. An example of a “polyethylene terephthalate” includes a polyester resin made from ethylene glycol and terephthalic acid. An example of a “nylon” is a polyamide polymer that is characterized by the presence of the amide group (—CONH).
- It is contemplated that additional polymeric scrim layer(s) can be added to the sheathing. For example, the sheathing may include polymeric scrim layers on opposing sides of the polymeric foam layer.
- Polymeric Foam Layer
- The
polymeric foam layer 14 is located adjacent to thescrim layer 12 inFIG. 1 . Thepolymeric foam layer 14 may be made from alkenyl aromatic resins, such as polystyrenic resin(s), and polyesters such as polyethylene terephthalates. The term “alkenyl aromatic polymer” as used herein includes polymers of aromatic hydrocarbon molecules that contain an aryl group joined to an olefinic group with only double bonds in the linear structure. Thepolymeric foam layer 14 may also be made from polyolefinic resins such as LDPEs, HDPEs, LLDPEs, and the like. Thepolymeric foam layer 14 is preferably made from a polystyrenic resin(s), such as a general purpose polystyrene, because of economical considerations at the present time. Thepolymeric foam layer 14, however, may be made from other polystyrenic resins such as impact polystyrenes. The impact polystyrenes that are generally used include medium impact polystyrenes and high impact polystyrenes. Thepolymeric foam layer 14 may also be made from a combination of virgin and/or reprocessed material. Thepolymeric foam layer 14, however, may also be made from polyisocyanurate foam. - The
polymeric foam layer 14 and thepolymeric scrim layer 12 may be bonded by attaching, adhering, fusing or the like. For example, thepolymeric foam layer 14 and thepolymeric scrim layer 12 may be thermally bonded to each another depending on the selected materials for forming thelayers - Adhesive and Other Layers
- Alternatively, the
polymeric foam layer 14 and thepolymeric scrim layer 12 may be attached with an adhesive layer. This is shown inFIG. 3 wheresheathing 30 includes apolymeric scrim layer 12, apolymeric foam layer 14 and anadhesive layer 16. Theoptional adhesive layer 16 is located between thepolymeric scrim layer 12 and thepolymeric foam layer 14. One type of adhesive that may be used is ethylene vinyl acetate (EVA). For example, modified EVAs such as BYNEL® made by DuPONT(® or Plexar® made by Equistar Chemicals may be used. These modified EVAs have melt indices generally from about 6.4 to about 25 g/10 min. as measured by ASTM D1238and densities generally from about 923 to about 947 kg/m3 as measured by ASTM D1505. BYNEL® is an adhesive that is designed to bond materials that would not ordinarily adhere to each other. - Other adhesives that may be used include block copolymers that comprise polymeric regions of styrene-rubber-styrene. For example, KRATON® made by Shell(® Chemical Company may be used. Other adhesives are contemplated in the present invention to bond the
polymeric scrim layer 12 to thepolymeric foam layer 14. - Additional layers are contemplated in the sheathings of the present invention. For example,
FIGS. 4, 5 and 6 depict a four-layer sheathing, a five-layer sheathing and a seven-layer sheathing, respectively. Referring specifically toFIG. 4 , sheathing 40 includes apolymeric scrim layer 12, apolymeric foam layer 14, anadhesive layer 16 and animpact polystyrenic layer 18. Thepolystyrenic layer 18 is preferably made from a high impact polystyrene because of its desired stiffness. Thepolystyrenic layer 18 may be biaxially orientated so as to provide additional durability and flexibility. -
FIG. 5 depicts asheathing 50 that is similar to thesheathing 40 ofFIG. 4 except that thesheathing 50 includes an additionalimpact polystyrenic layer 18.Sheathing 60 ofFIG. 6 comprises the same five layers of thesheathing 50 ofFIG. 5 . Thesheathing 60 ofFIG. 6 , however, also comprises two additional layers. Specifically, thesheathing 60 includes an additionaladhesive layer 16 and a polymeric film layer 20. To provide additional strength and durability, the polymeric film layer 20 may be made from a polyolefin(s) such as polypropylene. - Other layers are contemplated for the sheathings of the present invention. For example, the sheathings of the present invention may include radiant barrier layers or flame retardant layers.
- Properties of the Sheathing
- The sheathings of the present invention generally have a flexural strength of at least 100 lbs./in.2, preferably at least 150 lbs./in.2 and most preferably at least 200 lbs./in.2 as measured by ASTM D1307. The sheathings of the present invention have excellent strength so as to provide resistance to high winds. The sheathings of the present invention preferably satisfy the structural design requirements as set forth in the H.U.D. Guide for Manufactured Home Standards Programs (9th edition, Dec. 1994) for Wind Zone II conditions (a design wind speed of 100 miles per hour) taken from § 3280.305(c) of the Federal Register. The sheathings also preferably satisfy the structural design requirements as set forth in H.U.D. Guide for Manufactured Home Standards Programs (9th edition, Dec. 1994) for Wind Zone III conditions (a design wind speed of 110 mph) taken from § 3280.305(c) of the Federal Register.
- The sheathings of the present invention may be formed into a number of shapes. For example, the sheathing may be a flat sheet or a folded or hinged board (typically referred to as a fanfolded sheathing). The fanfold sheathing is designed to unfold at its hinges and includes a number of individual panels.
- The sheathings of the present invention may be manufactured in a variety of sizes. Popular sizes used in the housing market include a 4 foot by 7 foot (4′×7′), 4′×7½′, 4′×8′ and 4′×9′ flat sheets. Other popular sizes in the housing market include a 4′×50″ fanfolded sheathing which includes a number of individual panels. If a fanfolded sheathing is used, it is preferred to have cross-members in the wall supporting structure for which the fanfolded sheathing may be attached.
- The thickness of the sheathings may also vary. The thickness of the sheathing is generally from about ¼ of an inch to about 3 inches as measured by ASTM C303. The thickness of the sheathing is preferably from about ¼ of an inch to about ¾ of an inch as measured by ASTM C303.
- The layers of the sheathings typically vary in their respective weight percent relative to each other. The sheathings generally comprise from about 2 wt.% to about 30 wt.% of the polymeric scrim layer(s) 12. The sheathings generally comprise from about 25 wt.% to about 99 wt.% of the polymeric foam layer(s) 14. The sheathings generally comprise from 0 wt.% to about 15 wt.% of the adhesive layer(s) 16. It is contemplated that the remainder of the sheathings may include other optional layers. The sheathings generally comprise from 0 wt.% to about 50 wt.% of the impact polystyrenic layer(s) 18 and from 0 wt.% to about 50 wt.% of the polymeric film layer(s) 20.
- The sheathings preferably comprise from about 2 to about 25 wt.%, and most preferably from about 4 wt.% to about 20 wt.% of the polymeric scrim layer(s) 12. The sheathings preferably comprise from about 30 to about 95 wt.%, and most preferably from about 40 wt.% to about 90 wt.% of the polymeric foam layer(s) 14. Preferably, the sheathings comprise from about 1 to about 10 wt.%, and most preferably from about 1 wt.% to about 7 wt.% of the adhesive layer(s) 16. The sheathings preferably comprise from about 5 to about 35 wt.%, and most preferably from about 5 wt.% to about 30 wt.% of the impact polystyrenic layer(s) 18. The sheathings preferably comprise from 0 to about 25 wt.%; and most preferably from 0 wt.% to about 20 wt.% of the polymeric film layer(s) 20.
- The sheathings of the present invention may be used in various buildings such as prefabricated housing (also referred to as manufactured housing), site built housing, and remodeling. The sheathing may be installed to a wall supporting structure. An example is shown in
FIG. 7 where a sheathing 52 is installed to a plurality ofwall supporting structures 22 using thepolymeric scrim layer 112 ofFIG. 2 a. Thesheathing 52 a has been cut-away to depict thevarious layers FIG. 7 .FIG. 7 also showssiding 56 being located on an exterior surface of the sheathing 52. - The sheathing 52 of
FIG. 7 may be installed to the plurality ofwall supporting structure 22 by the use of fasteners (not shown). The fastener may be a mechanical fastener such as a staple or nail. According to the embodiment depicted inFIG. 7 , thepolymeric scrim layer 112 of the sheathing 52 includes afirst portion 102, asecond portion 104, and athird portion 106 opposite thesecond portion 104. The second andthird portions wall supporting structure 22. - It is contemplated that the sheathing of the present invention may be used in a roofing application to provide additional strength, to resist wind uplift and to provide durability that minimizes breakage during handling and installation. The sheathing may be used as an underlayment for low slope roofs.
- According to one process of the present invention, a polymeric web of foam is provided to form the polymeric foam layer. The process may use a single twin screw extruder or a tandem foam extrusion line. For example, the process begins by loading pellets of a polymeric resin(s) such as polystyrenic foam resin. The polymeric resins in their solid form are added into an extrusion hopper.
- A nucleating agent (also referred to as cell size control agent) or combination of such nucleating agents may be employed in the process of the present invention for advantages such as their capability for regulating cell formation and morphology. The amount of nucleating agent to be added depends upon the desired cell size, the selected blowing agent and the density of the polymeric composition. Known nucleating agents such as talc, mixtures of sodium bicarbonate and citric acid, and the like may be employed in the present invention.
- It is contemplated that stability control agent(s) may also be added to the polymeric resin(s), including conventional stability control agents. Some examples of stability control agents that may be used include, but are not limited to, glycerol monostearate, saturated higher fatty acid amides and glycerol monoester of a C20-C24 fatty acid.
- If desired, fillers, colorants, light and heat stabilizers, plasticizers, chemical blowing agents, flame retardants, foaming additives and plastic compounding agents may be added to the polymeric composition. The polymeric composition comprises the polymeric resin and, if added, the nucleating agent, the stability control agent and additives. The polymeric composition is conveyed through a feed zone of the extruder and heated at a temperature sufficient to form a polymeric melt.
- A physical blowing agent may be added at the injection port area of the extruder in an appropriate ratio to the target density. The selected blowing agent may be any type that is capable of producing foam with the selected resin. Some examples of blowing agents include physical blowing agents such as halocarbons, hydrocarbons or combinations thereof. Examples of these include commercially available hydrofluorocarbons, such as HFC-152a and HFC-134a, hydrochlorofluorocarbons, such as HCFC-22 or HCFC-142b, and the C3-C6 hydrocarbons. Other types of blowing agents include carbon dioxide. The polymeric composition and the selected blowing agent are thoroughly mixed within the extruder in a mixing zone and subsequently cooled in a cooling zone. The cooled polymeric-blowing agent melt is extruded thorough a die.
- One method of the present invention for making a three-layer sheathing is shown in a schematic flow diagram in
FIG. 8 . In the process ofFIG. 8 , the polymeric foam is extruded from anextruder 70 through around die 72. After exiting the round die 72, the extrudate expands when entering a lower pressure region (e.g., the atmosphere) and forms a polymeric web of foam. The polymeric web of foam is stretched over a sizingmandrel 74 to size and then is slit to form the web of foam. The polymeric web of foam will eventually be used in forming thepolymeric foam layer 14. - At least one of the outer surfaces of the polymeric web of foam is typically cooled so as to form a “skin.” The skin is typically about a few thousands (or a few mils) thick, but may vary depending on the cooling employed. The skin provides additional strength and also provides a smoother surface that is more aesthetically pleasing to a consumer if the polymeric layer is visible to the customer. It is contemplated that cooling methods may be accomplished by using air and water. The skinning may be performed, for example, by stretching the polymeric foam of
web 76 over the sizingmandrel 74 with optional cooling wherein either surface of the polymeric foam ofweb 76 is cooled. It is contemplated that one or more of the surfaces of the polymeric web of foam may be cooled. - The
polymeric foam web 76 proceeds to travel around a S-wrap of rollers 78 a-c in whichroller 78 a is an idler roller androllers rollers polymeric foam web 76 through the process of the present invention. Thepolymeric foam web 76 proceeds between two drivenrollers 80 a,b. Drivenrollers 80 a,b assist in maintaining a consistent surface on which a web of adhesive 82 a is added via an adhesive coating or alaminating machine 82. Theadhesive machine 82 may be any conventional machine that is capable of applying theadhesive web 82 a to thepolymeric foam web 76. Theadhesive machine 82 may coextrude the web of adhesive 82 a with a second web, such as a web of impact polystyrene (not shown). - At the about the same time, a web of
scrim 84 a is added via a roll unwindcart system 84. Thecart system 84 may include an edge alignment system to properly align the web ofscrim 84 a to thepolymeric foam web 76. After exiting the drivenrollers 80 a,b, thepolymeric foam web 76, the web of adhesive 82 a, and the web ofscrim 84 a form asheathing web 86. - It is contemplated that the
sheathing web 86 may be processed to include printing on one or more surfaces or other treatments. The process ofFIG. 8 includes anoptional printer 88 that prints on one surface of thesheathing web 86. It is contemplated that the printing may occur on thepolymeric foam web 76 before the webs of adhesive and scrim are added to thepolymeric foam web 76. Thesheathing web 86 proceeds around a series of rollers 90 a-90 d and then to an optionaledge trim system 92. The edge trim system assists in sizing thesheathing web 86 to be used in forming the sheathing of the present invention. - As shown in
FIG. 8 , thesheathing web 86 proceeds through an optionalperforating creasing machine 94. The perforatingcreasing equipment 94 may include any conventional equipment that is capable of folding thesheathing web 86 of the present invention into a fanfold sheathing web. Of course, if flat sheathing is desired, the creasingequipment 94 should not be included in the process. A perforating machine, however, may be used in producing a flat sheathing. The sheathing web is then cut to a desired dimension by shearingequipment 96. Theshearing equipment 96 may be any equipment capable of cutting thesheathing web 86 into desired dimensions. It is also contemplated that other finishing operations may occur such as stacking, counting, packaging and trimming. It is also contemplated that various measurements may be taken throughout the process to ensure consistent measurements. - According to a second process of the present invention (not shown), additional layers may be added in forming other sheathings, such as those described above. For example, a machine (not shown) may be added to the process of
FIG. 8 that is adapted to add an additional impact polystyrenic web to the polymeric web of foam. - Negative wind pressure load tests were conducted on samples of sheathing (“Sheathing 1”) using a 2×4 (1 ½ inches×3 ½ inches) stud wall supporting structure. Sheathing 1 had dimensions of 48 inches by 90 inches (48″×90″). Sheathing 1 consisted of five layers with the first layer being a woven polypropylene scrim having a scrim count of 28×4. The second layer was made of a BYNEL® adhesive. The third and fifth layers were made of high impact polystyrene. The second layer was located between the first and third layers. The fourth layer was a polystyrene foam and was located between the third and fifth layers. This is a similar structure as shown above in
FIG. 7 . The following describes the test specimens that were used in Example 1. - Example 1 Specimen Description
- A. Materials
-
- 1. Stud:
Double 2×4, Stud Grade spruce pine fur (SPF) spaced at 16″ on center (o.c.) - 2. Top Plate: Single 1×4, Ungraded SPF
- 3. Bottom Plate: Single 1×4, Ungraded SPF
- 4. Gypsum: 5/16″×48″×90″ Georgia Pacific
- 5. Siding: Georgia Pacific 4.5 Lap Vinyl Siding with a nailing flange thickness of 0.036 inch
- 6. Adhesive: PVA
- 1. Stud:
- B. Fastening
-
- Top plate attached to studs with three (3)- 7/16″×1 ¾″×15 gauge (Ga.) Staples.
- Bottom plate attached to studs with three (3)- 7/16″×1 ¾″×15 Ga. Staples.
- Sheathing 1 fastened with 1″×1 ½″×16 Ga. staples at 3″ o.c. on single framing members.
- Gypsum fastened to studs with 3/16″×1″×19 Ga. staples at 16″ o.c. per strip of siding.
- Gypsum glued to frame with a ⅜″ bead of PVA glue on all framing members.
- Siding fastened to Sheathing 1 into the studs with 7/16″×1 ½″×16 Ga. staples at 16″ o.c. per strip of siding.
- C. Construction
- The 48″×90″ test sample was first assembled with 2×4 studs that were 87.75 inches long. The top and bottom plates were 49.5 inches long. Polyethylene sheeting (6 mil) was placed between the 2×4 framing and Sheathing 1. The framing was then squared with Sheathing 1 and fastened as described above. The horizontal vinyl siding was fastened through Sheathing 1 and into the studs. The 5/16″ gypsum was then fastened to the opposite side of the frame as described above. Glue was allowed to cure for 7 days before the testing began. Materials for the assemblies tested were commercially purchased products.
- Example 1 Test Setup and Procedure
- The testing was conducted in accordance with the ultimate load test procedures in H.U.D. Guide for Manufactured Home Standards Programs (9th edition, Dec. 1994) taken from § 3280.401(b) of the Federal Register. An 11-¼″ deep wood box was built 1″ wider and 1″ longer than the test sample. The top and bottom plates of the test samples were secured to 2×4 ledgers. The test samples were placed vertically on the test fixture with the vinyl siding facing down and the ledgers bearing on top of the wood box. The polyethylene sheeting (6 mil) that was placed between the wall framing and Sheathing 1 was sealed to the table. This allowed the entire surface of Sheathing 1 to be exposed to the full negative loads.
- The uniform load was applied by evacuating the air below the test specimen using a vacuum pump. The applied load was measured with a water manometer capable of reading in 0.1 inch increments. The load was applied in approximate ¼ design live load increments at 10 minute intervals until 1.25 times design load was reached. The load was then increased to 2.5 times design load or until failure occurred. The load in inches of water column was converted to pounds per square foot (psf) by using the conversion of 1 inch (of water column) to 5.2 psf.
- Deflection readings were taken using dial indicators capable of reading in 0.001″ increments. The deflections were taken at the quarter-points of the center stud.
- Example 1 Results
- Three specimens (S1, S2, and S3) using 5/16″ Georgia Pacific Gypsum were tested for corner Wind Zone III requirements. The product sold by Georgia Pacific Corporation that was used was 5/16″ PreDeck® Gypsum Board. The ultimate load in pounds per square foot (psf) was determined in accordance with H.U.D. Guide for Manufactured Home Standards Programs (9th edition, Dec. 1994) taken from § 3280.401(b) of the Federal Register. The average of these three specimens is shown under the “AVG.” column. The results are as follows in Table 1.
TABLE 1 ULTIMATE EXPER. LOAD (PSF) AVG. DEFLECTION NO. S1 S2 S3 (PSF) (PASS/FAIL) WINDZONE 1 156 150.8 161.2 156 PASSED III Corner - The samples in Experiment 1 satisfied the ultimate load under a corner condition for Wind Zone III. In addition, the samples in Experiment 1 also passed the deflection test under a comer condition for Wind Zone III. The ultimate load requirement for Wind Zone III for a non-corner condition is 115 psf, while the ultimate load requirement for Wind Zone III for a corner condition is 145 psf.
- Negative wind pressure load tests were conducted on samples of 48″×90″ Sheathing 1 (described above in Example 1). The following describes the test specimens that were used in Example 2.
- Example 2 Specimen Description
- A. Materials
-
- 1. Stud: 2×4, Stud Grade SPF spaced at 16″ o.c.
- 2. Top Plate: Single 1×4, Ungraded SPF
- 3. Bottom Plate: Single 1×4, Ungraded SPF
- 4. Gypsum: 5/16″×48″×90″ Gypsum, Georgia-Pacific
- 5. Siding: Georgia Pacific 4.5 Lap Vinyl Siding with a nailing flange thickness of 0.036 inch
- 6. Adhesive: PVA
- B. Fastening
-
- Top plate attached to studs with three (3)- 7/16″×1¾″×15 Ga. Staples.
- Bottom plate attached to studs with three (3)- 7/16″×1¾″×15 Ga. Staples. * Sheathing 1 fastened with 1″×1½″×16 Ga. staples at 3″ o.c. on framing members.
- Gypsum fastened to studs with 3/16″×1″×19 Ga. Staples at 16″ o.c. per strip of siding.
- Gypsum glued to frame with a ⅜″ bead of PVA glue on all framing members.
- Siding fastened to sheathing into the studs with 7/16″×1½″×16 Ga. staples at 16″ o.c. per strip of siding.
- C. Construction
- The construction was similar to that described above in Example 1.
- Example 2 Test Setup and Procedure
- The test setup and procedure were similar to that described above in Example 1.
- Example 2 Results
- Three specimens (S1, S2, S3) using 5/16″ Georgia-Pacific Gypsum were tested for non-comer Wind Zone III requirements. The results are as follows in Table 2.
TABLE 2 ULTIMATE EXPER. LOAD (PSF) AVG. DEFLECTION NO. S1 S2 S3 (PSF) (PASS/FAIL) WINDZONE 2 135.2 140.4 135.2 136.9 PASSED III Non- Corner - The samples in
Experiment 2 passed the requirement for ultimate load under a non-comer condition for Wind Zone III. In addition, the samples inExperiement 2 also passed the deflection test under a non-comer condition for Wind Zone III. - While the present invention has been described with reference to one or more particular embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present invention. Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the claimed invention, which is set forth in the following claims.
Claims (23)
1. A sheathing adapted to be fastened to at least one wall supporting structure, comprising at least two layers:
(a) a first layer comprising a polymeric foam layer;
(b) a second layer comprising a woven polymeric scrim, said second layer being located adjacent to said first layer, wherein the polymeric scrim includes a first portion and a second portion, the second portion being located near the periphery of the polymeric scrim layer, the first portion having a first machine direction scrim count number and a first transverse direction scrim count number, the second portion having a second machine direction scrim count number and a second transverse direction scrim count number, at least one of the second machine direction scrim count number and the second transverse direction scrim count number being greater than the respective first machine direction scrim count number or the first transverse direction scrim count number;
(c) an adhesive located between said first and said second layers; and
(d) a third layer comprising an impact polystyrene, said first layer being located between the adhesive and said third layer.
2. The sheathing of claim 1 , wherein the polymeric scrim includes a third portion, the third portion being located near the periphery of the polymeric scrim layer opposite the second portion, the third portion having a third machine direction scrim count number and a third transverse direction scrim count number, at least one of the third machine direction scrim count number and the third transverse direction scrim count number being greater than the respective first machine direction scrim count number or the first transverse direction scrim count number.
3. The sheathing of claim 2 , wherein the second and third machine direction scrim count numbers are the same.
4. The sheathing of claim 2 , wherein the second and third transverse direction scrim count numbers are the same.
5. The sheathing of claim 2 , wherein the second and third portions are located generally parallel to the at least one wall supporting structure.
6. The sheathing of claim 2 , wherein the second and third machine direction scrim count numbers are the same and the second and third transverse direction scrim count numbers are the same.
7. The sheathing of claim 1 , wherein the second machine direction scrim count number is at least about two times the first machine direction scrim count number.
8. The sheathing of claim 2 , wherein the second and third machine direction scrim count numbers are at least about two times the first machine direction scrim count number.
9. The sheathing of claim 1 , wherein the second machine direction scrim count number is at least about four times the first machine direction scrim count number.
10. The sheathing of claim 2 , wherein the second and third machine direction scrim count numbers are at least about four times the first machine direction scrim count number.
11. The sheathing of claim 1 , wherein the second machine direction scrim count number is at least about six times the first machine direction scrim count number.
12. The sheathing of claim 2 , wherein the second and third machine direction scrim count numbers are at least about six times the first machine direction scrim count number.
13. The sheathing of claim 1 , wherein the thickness of the sheathing is from about 0.25 inch to about 3 inches.
14. The sheathing of claim 2 , wherein the second and third portions extend from the periphery of the polymeric scrim layer inwardly about 2 to about 3 inches.
15. The sheathing of claim 1 , wherein the first layer is a polyethylene terephthalate foam.
16. The sheathing of claim 1 further including a fourth layer comprising an impact polystyrene, said fourth layer being located adjacent to said first layer and said first layer being located between said third and said fourth layers.
17. The sheathing of claim 16 further including a polymeric film layer, said third layer located between said first layer and said polymeric film layer.
18. The sheathing of claim 1 , wherein said impact polystyrene is a high impact polystyrene.
19. The sheathing of claim 1 further including a polymeric film layer, said third layer located between said first layer and said polymeric film layer.
20. The sheathing of claim 1 , wherein said polymeric foam is a polyolefin foam.
21. The sheathing of claim 1 wherein said polymeric foam is a polystyrenic foam.
22. The sheathing of claim 1 , wherein said polymeric scrim is a polypropylene scrim.
23. The sheathing of claim 1 , wherein said polymeric scrim is a polyolefin scrim.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/472,076 US20060236641A1 (en) | 1999-10-20 | 2006-06-21 | Polymeric foam and scrim sheathings |
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Application Number | Priority Date | Filing Date | Title |
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US09/421,031 US6536176B1 (en) | 1999-10-20 | 1999-10-20 | Polymeric foam and scrim sheathings |
US09/660,649 US7100337B1 (en) | 1999-10-20 | 2000-09-13 | Polymeric foam and scrim sheathings |
US10/782,480 US7093397B2 (en) | 1999-10-20 | 2004-02-19 | Polymeric foam and scrim sheathings |
US11/472,076 US20060236641A1 (en) | 1999-10-20 | 2006-06-21 | Polymeric foam and scrim sheathings |
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US10/782,480 Continuation US7093397B2 (en) | 1999-10-20 | 2004-02-19 | Polymeric foam and scrim sheathings |
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US10/782,480 Expired - Fee Related US7093397B2 (en) | 1999-10-20 | 2004-02-19 | Polymeric foam and scrim sheathings |
US11/472,076 Abandoned US20060236641A1 (en) | 1999-10-20 | 2006-06-21 | Polymeric foam and scrim sheathings |
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US10/782,480 Expired - Fee Related US7093397B2 (en) | 1999-10-20 | 2004-02-19 | Polymeric foam and scrim sheathings |
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US7093397B2 (en) | 2006-08-22 |
US20040163348A1 (en) | 2004-08-26 |
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