Spunbond facing and faced insulation assembly

A faced building insulation assembly for insulating wall, ceiling, floor and roof cavities, comprising;

• a fibrous insulation layer;
• the insulation layer having a length, a width and a thickness;
• the insulation layer having first and second major surfaces defined by the length and width of the layer;
• a first facing overlaying the first major surface of the insulation layer forming a first major surface of the faced building insulation assembly;
• the first facing comprising a spunbond continuous polymeric filament mat that consists essentially of continuous filaments selected from a group consisting of polyester, polypropylene, and polyethylene filaments;
• the first facing being fungi growth resistant;
• and the first facing, as bonded to the insulation layer, being fungi growth resistant;
• a heat activated, open polymeric web or mesh, polymeric particulate, or fiberized polymer bonding layer, having a lower softening point than the spunbond continuous polymeric filament mat of the first facing, located between the first facing and the first major surface of the insulation layer;
• the first facing being bonded to the first major surface of the insulation layer by the bonding layer;
• a second facing bonded to the second major surface of the insulation layer;
• the second facing forming a second major surface of the faced building insulation assembly;
• the first facing, as bonded to the first major surface of the insulation layer, having a water vapor permeance rating that of about 5 perms or greater so that the first major surface of the faced building insulation assembly formed by the first facing has a water vapor permeance rating of about 5 perms or greater;
• and
• the second facing, as bonded to the second major surface of the insulation layer, having water vapor permeance rating of about 1 perm or less so that the second major surface of the faced building insulation assembly has a water vapor permeance rating of about 1 perm or less.