Variable perm sheet material, facing, and insulation assembly
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United States of America Patent
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N/A
Issued Date -
Jan 6, 2005
app pub date -
Jul 21, 2004
filing date -
Mar 20, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Permeance ratings of a variable perm sheet material, facing, and faced building insulation assembly vary with ambient humidity and/or temperature. In the insulation assembly, a facing is bonded to a major surface of an insulation layer. A central field portion of the facing, as bonded to the insulation layer, has variable water vapor transmission properties that vary from a relatively low permeance when exposed to ambient conditions of low humidity to a relatively high permeance when exposed to ambient conditions of high humidity. Preferably, the facing, as part of an insulation assembly, is fungi growth-resistant and may include a bonding layer, such as a heat activated bonding layer, that bonds the facing to an insulation layer. The sheet material may be embossed to affect its water vapor transmission characteristics.
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