How To Seal Attic Before Blowing Insulation

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

How to seal attic before blowing insulation.

Stick the spray foam nozzle in the hole with it and give it a quick squirt. The eaves don t get blocked. Find the lighting electrical box for each room and cover it with a dose of spray foam. 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.

Fasten blocking around the hatch or door to allow the material to be installed around this area without escaping. Handy homeowners can install blown in insulation in the attic. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter. Use one inch thick boards to create barriers and attach the boards to the adjacent ceiling joists.

To make it easy to eyeball how level the material is as you blow it in screw depth guides to joists throughout the space. 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. Find electrical wires that are penetrating the ceiling.

Common methods for air sealing include filling holes with expanding foam and caulk. Apply self adhesive foam weatherstrip tape to the top edge of the stop. 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. And you avoid wood rot and mold.

Hot air doesn t get formed. Also keep in mind that even with air sealing attics typically require some degree of ventilation.