May Energy Solutions will utilize the latest materials and methods to seal the envelope of the house during construction to keep your conditioned air inside and the Texas weather outside. Gaskets are recommended at the top and bottom of walls and around doors and windows to prevent leakage. Expanding foam is used to insulate and fill large gaps between doors and windows and the wall framing, and also used to fill the holes drilled in the framing for electrical wiring and plumbing pipes. Foam or caulk is used to seal gaps between drywall and electrical boxes or plumbing pipes. Caulk is used to seal small gaps around door and window trim. Can lights in the ceiling are sealed with boxes made from fireproof mineral wool.