How To Seal Attic Before Blowing Insulation

Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11.

How to seal attic before blowing insulation. The eaves don t get blocked. Choose boards that will be higher than the finished depth of your blown insulation. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter. Also keep in mind that even with air sealing attics typically require some degree of ventilation.

Apply self adhesive foam weatherstrip tape to the top edge of the stop. Common methods for air sealing include filling holes with expanding foam and caulk. Find the lighting electrical box for each room and cover it with a dose of spray foam. Blowing insulation into walls is best left to the pros because it involves drilling into stud spaces that may contain electrical.

Fasten blocking around the hatch or door to allow the material to be installed around this area without escaping. Make sure the fill s depth is uniform across the attic. You are not trying to shove foam down the wall but rather make an air tight cap on top. Stick the spray foam nozzle in the hole with it and give it a quick squirt.

Handy homeowners can install blown in insulation in the attic. Then to really seal the attic access up tight says olson lay fiberglass batt insulation on the inside of the hatch or door and wrap it up tight like a christmas present photo 3. 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. Install ventilation baffles essentially plastic or foam vents into the eaves by pulling the existing insulation away from the roof positioning the new vent chute so the bottom extends six inches into the overhang and stapling it into place.

Hot air doesn t get formed. And you avoid wood rot and mold.