How To Seal Attic Before Blowing Insulation

Fasten blocking around the hatch or door to allow the material to be installed around this area without escaping.

How to seal attic before blowing insulation.

And you avoid wood rot and mold. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter. Make sure the fill s depth is uniform across 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.

Find the lighting electrical box for each room and cover it with a dose of spray foam. Choose boards that will be higher than the finished depth of your blown insulation. The eaves don t get blocked. Hot air doesn t get formed.

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. 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.

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. 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. Handy homeowners can install blown in insulation in the attic.

Blowing insulation into walls is best left to the pros because it involves drilling into stud spaces that may contain electrical. Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11.