Air Sealing Attic With Spray Foam

In a vented attic all of that expensive airflow is lost to the environment.

Air sealing attic with spray foam. When we seal the attic with spray foam it s as tight as a butter tub. According to energy star the worst air leaks typically come from the attic or basement. Apply self adhesive foam weatherstrip tape to the top edge of the stop. When you re done sealing your attic bypasses push the insulation back into place with an old broom handle or stick as you back out of the attic.

Activate can by pulling the trigger. One huge benefit of the spray foam insulated attic is that conditioned air leakage from the ac furnace duct system is contained and used to condition the attic. Wipe away imperfections with a cloth soaked in great stuff foam cleaner. Spray foam insulation does a better job getting into the cracks and crannies than regular fiberglass insulation and since you don t want to repeat the job in the near future you might as well go with the best material available.

The first step in sealing leaks is identifying them. Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11. Do not use spray foam. Once cured cut excess foam with a serrated knife as desired.

Air sealing an attic is a big job that s not for the feint of heart. You may find that you need fiberglass insulation for larger gaps but spray foam insulation is an effective solution for smaller holes around pipes corners and even outlets. Seal the gap between the flue and metal flashing with special high temperature caulk. Even though most of the gaps spilling warm air into your attic are buried under insulation you might be able to find evidence of them.

If not mist with water. Invert can and insert it into the gap around the attic hatch.