Construction debris must be removed from spaces to be insulated. Insulation should be installed just before the interior finish is applied. This means that the following-listed work, as applicable, has been performed.

Foundation walls are in place. Sidewalls, floors, roof and ceiling have been framed.

Roofing is finished and doors, windows, subflooring and sheathing are in place.

Plumbing, wiring (including telephone and other low-voltage wiring) and heating, ventilating and air conditioning work have been completely roughed in. If any part of this work is done following the installation of the insulation, the vapor retarder may be damaged and gaps may be made in the insulation. Openings in the insulation or vapor retarder will reduce the effectiveness of the material.