Installing Rigid Foam Insulation In An Attic

When installing rigid insulation in an attic to be finished as a living space you must provide a route by which hot air.

Installing rigid foam insulation in an attic.

When installing foam insulation boards in the attic make sure you start from one corner and work your way around the room. Alternate fasteners may be used with the type and length as recommended by their manufacturer for securing foam plastic insulating sheathing. Keep foam board insulation away from direct sunlight prior to installation. Fasten foam insulation boards to the interior of the rafters using screws or nails with 1 inch minimum washers or caps.

Once the attic is prepared then start to install the insulation. A table saw will also cut the board but it. 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.

All foam boards absorb water vapor. 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. Fasteners should be long enough to penetrate in to the rafter a minimum of inch. 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.

How do you install rigid foam board. The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy. In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the. For more information on the work i have described see two ways to insulate attic kneewalls.

Cut the insulation with a utility knife. Seal the perimeter of each piece of rigid foam with caulk canned spray foam or high quality tape. 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.

You can use a utility knife to cut using the same cut and snap process you use with drywall. 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.