Can You Spray Foam an Attic

Insulate the attic or roof of a new home by installing spray polyurethane foam insulation – either open cell or closed cell – on the underside of the roof deck. … Seal any penetrations from the home into the attic through the attic floor. Provide conditioning, dehumidification, or controlled ventilation to the attic.

Is it OK to spray foam attic?

“Open-cell foam can only be put in dark areas such as an attic or behind walls,” Harris said. … Closed-cell spray foam is a better choice for keeping subfloor moisture at optimal levels, while open-cell spray foam is a better choice for walls and attics, because it allows homes to “breathe.”

Can you spray foam attic floor?

Remove any existing insulation, debris, and dust, and prepare the attic floor for spray foam insulation. Verify that all attic floor penetrations can be adequately sealed with spray foam insulation. … Install a minimum of 1 inch of spray foam insulation over the attic floor to provide a continuous air control layer.