Patent ID: 7282252

Claim:
A faced building insulation assembly for insulating a building wall, ceiling, floor, or roof cavity, comprising: a resilient fibrous insulation layer having a density of about 1.6 pounds/ft 3 or less; the insulation layer having a length, a width and a thickness; the insulation layer having first and second major surfaces defined by the length end width of the insulation layer; a first facing sheet having a central field portion overlaying and substantially coextensive with the first major surface of the insulation layer and forming a first major surface of the building insulation assembly for location on a normally cooler and less humid side of a building wall, ceiling, floor, or roof cavity being insulated with the building insulation assembly; the central field portion of the first facing sheet being bonded to the first major surface of the insulation layer, the central field portion of the first facing sheet, as bonded to the first major surface of the insulation layer, having a water vapor permeance rating of about 5 perms or greater so that the first major surface of the faced building insulation assembly formed by the central field portion of the first lacing sheet has a water vapor permeance rating of about 5 perms or greater to permit the passage of water vapor through the first major surface of the building insulation assembly; and a second facing sheet having a central field portion overlaying and substantially coextensive with the second major surface of the insulation layer and forming a second major surface of the building insulation assembly for location on a normally hotter and more humid side of a building wall, ceiling, floor, or roof cavity being insulated with the building insulation assembly; the central field portion of the second facing sheet being bonded to the second major surface of the insulation layer, the central field portion of the second facing sheet, as bonded to the second major surface of the insulation layer, having a water vapor permeance rating of 1 perm or less so that the second major surface of the faced building insulation assembly has a water vapor permeance rating of 1 perm or less to retard the passage of water vapor through the second major surface of the building insulation assembly.