Installing Rigid Foam Insulation In An Attic

In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the.

Installing rigid foam insulation in an attic.

Cover the insulation with a vapor barrier before you install it. The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy. Fasteners should be long enough to penetrate in to the rafter a minimum of inch. 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.

How do you install rigid foam board. A table saw will also cut the board but it. It will degrade its r value. Use a chalk line or t square to mark where it needs to be cut.

You can use a utility knife to cut using the same cut and snap process you use with drywall. Alternate fasteners may be used with the type and length as recommended by their manufacturer for securing foam plastic insulating sheathing. Mark the insulation where it lines up with the center of the rafter closest to the farthest edge. Measure the space between rafters and cut the board to fit.

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. 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. 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.

Keep foam board insulation away from direct sunlight prior to installation. Start at one corner of the attic and lay the piece of insulation lengthwise like a piece of drywall. When installing a foil faced foam board insulation. Cut the insulation with a utility knife.

Fasten foam insulation boards to the interior of the rafters using screws or nails with 1 inch minimum washers or caps. Seal the perimeter of each piece of rigid foam with caulk canned spray foam or high quality tape. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor.