Installing Rigid Foam Insulation In An Attic

Measure the space between rafters and cut the board to fit.

Installing rigid foam insulation in an attic.

It will degrade its r value. The superattic system utilizes proprietary silverglo rigid foam insulation panels to fully seal and insulate the attic directly beneath the roof rafters and directly inside the gable ends. For more information on the work i have described see two ways to insulate attic kneewalls. In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the.

Alternate fasteners may be used with the type and length as recommended by their manufacturer for securing foam plastic insulating sheathing. Seal the perimeter of each piece of rigid foam with caulk canned spray foam or high quality tape. Use a chalk line or t square to mark where it needs to be cut. Foam insulation boards can be attached to concrete walls as well and in such a case care should be taken not to chip the cement.

Keep foam board insulation away from direct sunlight prior to installation. How do you install rigid foam board. If there is any horizontal section of these joist bays that are exposed on one side to unconditioned space then the joist bays need to be insulated. The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy.

Start at one corner of the attic and lay the piece of insulation lengthwise like a piece of drywall. Cover the insulation with a vapor barrier before you install it. A table saw will also cut the board but it. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor.

Fasten foam insulation boards to the interior of the rafters using screws or nails with 1 inch minimum washers or caps. When installing a foil faced foam board insulation. You can use a utility knife to cut using the same cut and snap process you use with drywall. Cut the insulation with a utility knife.

Fasteners should be long enough to penetrate in to the rafter a minimum of inch. When installing rigid insulation in an attic to be finished as a living space you must provide a route by which hot air. All foam boards absorb water vapor.