For most areas, vapor retarders should be installed on the warm-in-winter side of the insulation (toward the interior). Check with local practice and building codes. CertainTeed insulation is not intended to be installed with the facing placed toward the exterior of the building.
Installation in wood framing:
Studs – Faced insulation fits between wood studs with flanges stapled either to the faces or sides of the studs. Pull flanges taut while stapling every 8"–12" (203–305 mm) to prevent gaps.
Attics/Ceiling Joists – Faced insulation is placed between joists with vapor retarder facing down. Flanges or separate vapor retarder can be stapled to bottom faces or sides of joists if insulation is installed before ceiling finish. If no insulation is present, place the insulation between the attic joists. When insulation must be cut to fit, use a sharp knife or shears. If the attic already has some insulation, first fill to the top of the joist with insulation, then lay additional insulation across the joists. Do not cover vents or exhaust fan motors which protrude into the attic; cut the insulation to fit around them. Only unfaced EasyTouch insulation is installed over existing insulation.
Floor Joists – Faced insulation is installed with the vapor retarder facing up and in contact with the floor. All insulation must be supported between joists on an approved support such as wire. Cathedral Ceilings–Faced insulation with vapor retarder facing down is stapled between the rafters. A 1" air space is recommended between insulation and roof sheathing. If unfaced insulation is used, a separate vapor retarder should be installed where required.
CertainTeed has earned a reputation as a premier building materials manufacturer for more than 100 years. For every part of the building, CertainTeed offers a quality line of roofing, vinyl and fiber cement siding, pvc trim, sheathing, fence, railing, decking, foundation, windows, insulation, drywall and performance wallboards, ceilings, and pipe products for both residential and commercial building applications.
