How To Seal Attic Before Blowing Insulation

Also keep in mind that even with air sealing attics typically require some degree of ventilation.

How to seal attic before blowing insulation.

Apply self adhesive foam weatherstrip tape to the top edge of the stop. Find electrical wires that are penetrating the ceiling. To make it easy to eyeball how level the material is as you blow it in screw depth guides to joists throughout the space. Use one inch thick boards to create barriers and attach the boards to the adjacent ceiling joists.

Blowing insulation into walls is best left to the pros because it involves drilling into stud spaces that may contain electrical. You are not trying to shove foam down the wall but rather make an air tight cap on top. 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. Make sure the fill s depth is uniform across the attic.

Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11. Fasten blocking around the hatch or door to allow the material to be installed around this area without escaping. And you avoid wood rot and mold. The eaves don t get blocked.

Common methods for air sealing include filling holes with expanding foam and caulk. Choose boards that will be higher than the finished depth of your blown insulation. 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. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter.

Hot air doesn t get formed. Find the lighting electrical box for each room and cover it with a dose of spray foam.