How To Seal Attic Before Blowing Insulation

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.

How to seal attic before blowing insulation.

Also keep in mind that even with air sealing attics typically require some degree of ventilation. To make it easy to eyeball how level the material is as you blow it in screw depth guides to joists throughout the space. Make sure the fill s depth is uniform across the attic. Find electrical wires that are penetrating the ceiling.

Find the lighting electrical box for each room and cover it with a dose of spray foam. Hot air doesn t get formed. And you avoid wood rot and mold. Common methods for air sealing include filling holes with expanding foam and caulk.

Stick the spray foam nozzle in the hole with it and give it a quick squirt. You are not trying to shove foam down the wall but rather make an air tight cap on top. Use one inch thick boards to create barriers and attach the boards to the adjacent ceiling joists. Fasten blocking around the hatch or door to allow the material to be installed around this area without escaping.

Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter. The eaves don t get blocked. Blowing insulation into walls is best left to the pros because it involves drilling into stud spaces that may contain electrical.

Choose boards that will be higher than the finished depth of your blown insulation. 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.