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2 measure and cut the foam boards as.
Adding foam board to inside of attic space. Step 2 install insulation boards. Affix rigid foam insulation to the attic side of the hatch or door. Attic hatch or door. Then 2 rigid foam insulation was placed on top of the floor joists followed by plywood flooring.
Foam board insulation is easy to cut with a circular saw with a masonry blade or scored with a utility knife and snapped like you would drywall. Add weatherstripping around the perimeter and a sweep to the door of a walk up attic. To attach the insulation you can use screws with large washers a special adhesive made for adhering foam board insulation or for smaller pieces you can seal them in with caulk or spray foam. First the bays between the joists were filled with fiberglass insulation.
Due to cost considerations i looked at an additional five inches for a total of 12 inches and a r30 rating. Installing foam insulation board in an attic. Energy saver eliminates the need to remove attic flooring and lose valuable attic storage space in order to make major energy saving upgrades in the attic. Nothing unusual about that.
It seems to me that the rigid foam should have more bearing surface than the 1 5 afforded by the floor joists. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents. Step 4 cut foam boards. Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Select rigid foam insulation boards that are at least 1 2 inch less in thickness than the rafter space is deep if you plan to finish the attic as living space. Normally in occupied areas all spray foam must be covered by a 15 minute thermal barrier such as thick drywall per code requirements in irc section 316 4 and ibc section 2603 4. Step 3 place caulking and furring strips. Pull down stair or ladder.
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. Intumescent coatings are not always needed to coat spray foam in the attic in order to meet code thermal barrier requirements. Earlier this year i got a question about a home that had spray foam insulation in the attic. A local company is saying that i need 19 inches for an r50 rating.
Remove any existing pieces of insulation that might have been covering the attic walls until now.
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