polyethylene flange

 

Measuring and Cutting Insulation For Walls
Measure slabs of insulation the length of the stud space plus 2 inches, to assure a tight fit. Use a straight edge and a sharp knife to cut the insulation, facing side up.

Peel back insulation 1 inch at the top and bottom of facing. This forms a stapling flange. (If you are using 48-inch precut batts, it will only be necessary to peel back the insulation at one end.)

Insulating Unfinished Wood Frame Walls
The way that you install insulation in an unfinished wall depends on whether the unfinished side faces a heated space or not. The vapor barrier must always come between the heated space and the insulation, to protect it from moisture produced by the household activities.

When installing foam board, you should "fur out" the walls, even though the board can be applied directly to the masonry using mastic. Foam board is highly flammable and must be covered with a fire retardant finish material (such as ½ inch gypsum board or paneling) after installing. The finish material is installed by nailing it to the furring.

"Fur out" the walls as described and glue foam board between the lumber furring strips. Cut the board to fit using a sharp knife. Be sure to install a vapor barrier (6-mil polyethylene or vapor barrier paint) if insulation is unfaced (Fig. 6.10). Finish according to local building codes for the application of paneling. Information is available from your utility.

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