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!
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. In the same time it’s essential to provide ventilation for fresh air and making that upcoming moisture like condensation can dry.
Builders can use a variety of products to seal a home’s envelope, such as caulks, foams, gaskets, weatherstripping, door sweeps, and house wraps. For homes that are sealed very tightly, mechanical ventilation systems are available.
Air leakage and improperly installed insulation can waste 20 percent or more of the energy you pay to heat and cool your home. An essential step for improving energy efficiency is the proper sealing of air leaks throughout the building to stop drafts. Some are easy to identify, others are more difficult to find and fix, for example in the attic, basement, and crawlspaces. We use caulk, spray foam, or weather stripping.
After the leaks are sealed, high performance insulation is added to the walls, attic, basement, and also the duct work of your HVAC system.
The next step of ZNE is installing an appropriate HVAC system.