In typical homes, air leaks are often found at cracks, small holes, and penetrations for plumbing, wiring, lighting, and ductwork. Together, these leaks can add up to as
much air loss as having an open window! It’s easy to imagine how this can increase a homeowner’s utility bills and reduce comfort.
Sealing a home’s envelope—its exterior walls, ceiling, and floors—is an important step in controlling the indoor environment and lowering energy bills. The goal is to reduce air leakage as much as possible, while providing ventilation as needed for fresh air. In other words, “build it tight and ventilate it right.”