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.

Find electrical wires that are penetrating the ceiling. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter. To make it easy to eyeball how level the material is as you blow it in screw depth guides to joists throughout the space. You are not trying to shove foam down the wall but rather make an air tight cap on top.

Hot air doesn t get formed. Choose boards that will be higher than the finished depth of your blown insulation. Make sure the fill s depth is uniform across the attic. 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.

And you avoid wood rot and mold. Handy homeowners can install blown in insulation in the attic. 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.

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. Stick the spray foam nozzle in the hole with it and give it a quick squirt. Find the lighting electrical box for each room and cover it with a dose of spray foam. Use one inch thick boards to create barriers and attach the boards to the adjacent ceiling joists.

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.