You can stem the flow of air and money by air sealing your light fixtures from the inside with just a roll of painter s tape a can of spray foam insulation and a tube of painter s caulk.
How to seal light fixtures in attic.
Apply self adhesive foam weatherstrip tape to the top edge of the stop.
In this video mike guertin shows how.
Cut 1 3 boards to fit the perimeter of the opening and nail them on with 6d finish nails.
Carry the box spray foam and a utility brush to the attic.
Seal the attic access weatherstrip the attic access hatch or door.
Sealing a ceiling electrical box caulk the wire knockouts and the ceiling penetration.
If you have recessed light fixtures in your home you may also have a significant volume of conditioned air escaping into your attic.
Even though light fixtures fasten tight to the ceiling there s enough of a gap to let air flow through the many holes in and around the electrical boxes they re fastened to.
Clear away any residual insulation at the ceiling area around the light by hand or using the brush.
In condensation in the attic marc rosenbaum suggested that ceiling fans recessed lights and other fixtures be sealed to reduce air leakage into attics.