Composite wood structure
AssigneeAndersen Corporation
InventorsThomas A. Klasell, Leland R. Miller
Life of this patent
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Abstract
Disclosed is a composite wood structure including (a) first and second spaced layers, and (b) a core interposed between the layers. A sheet-like vapor barrier is between the layers and limits migration of moisture through the barrier to less than about 6 grams per square meter of barrier area per hour. The wood structure is thereby made warp-resistant. In another embodiment, the structure has a vapor barrier on an outer surface and may have one or more additional vapor barriers between structure layers. Preferred vapor barrier materials include melamine formaldehyde impregnated paper, phenol formaldehyde impregnated paper, thermoset materials, thermoplastic materials and aluminum foil.
Claims16
In a composite wood structure useful in making doors and windows, the structure including (a) first and second spaced layers, and (b) a core interposed between the layers, such structure having a thickness, the improvement wherein:
- the structure is substantially fiber-free and includes a sheet vapor barrier between the layers and coextensive with the layers;
- the vapor barrier is bonded and substantially free of biomass particles;
- the vapor barrier comprises less than about 20% of the thickness of the structure;
- and
- the vapor barrier limits migration of moisture to less than about 6 grams per square meter of barrier area per hour,
- whereby the wood structure is made resistant to warpage due to moisture migration.
A composite wood structure useful in making doors and windows, the structure having a thickness and including:
- first and second spaced layers having first and second outer surfaces, respectively;
- and
- an exterior vapor barrier bonded to each of the outer surfaces and coextensive with such outer surfaces;
- and wherein:
- the vapor barriers are substantially free of biomass particles;
- the vapor barriers comprise less than about 20% of the thickness of the structure;
- the structure is substantially fiber-free;
- and,
- the vapor barriers limit moisture migration to less than about 6 grams per square meter of surface area per hour,
- whereby the wood structure is made resistant to warpage due to moisture migration.
Dependencies are inferred from the claim text.