Envelope

Fix Air Leaks

Seventy-five percent of a building's total air loss is from small leaks. Seal electrical outlets and gaps between moldings, as well as plumbing and wiring penetrations. Attic checkpoints include hatches, plumbing vents, chimneys and other roof or wall penetrations. Many areas can be sealed with a caulk gun and tubes of silicone or urethane caulking. For larger areas, foam sealants may work best. Outlet plugs and foam pads that are installed behind outlet and switch covers are wise investments.