Recessed pot lights (also called can lights) are one of the most common air leakage points through the ceiling plane into the attic. Air leakage occurs between the housing and the ceiling air barrier (either the polyethylene sheet, if present, or the interior finish) and through the fixtures' housing holes and its electrical connections. Currently, light fixtures are available with or without ratings for insulation contact (IC) and airtightness (AT). Most new homes will utilize IC/AT-rated fixtures, and most older homes utilize non-IC/AT-rated fixtures. IC-rated fixtures allow for direct contact with insulation (up to 8" deep) whereas non-IC-rated fixtures require no insulation to be within up to 3" of all sides and the top to allow for heat dissipation.

The first procedure is for leaky non-IC-rated pot lights. A similar procedure could also be followed for leaky IC-rated pot lights. If the light housing is airtight and has been properly sealed to the ceiling air barrier, this procedure is not required. Proprietary fire-rated airtight housing covers are also available, and may simplify this procedure.

The second procedure is for replacing non-IC-rated pot lights with IC and AT-rated replacement fixtures. Replacing existing pot lights with IC/AT fixtures is recommended, as it simplifies and improves the ceiling air sealing and insulation procedures.