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Envelope Air Sealing

Common Air Leaks include:

• Attic hatch
• Plumbing vent
• Recessed light
• Duct/flue chase
• Basement rim joists
• Behind knee-walls
• Open soffits
• Ductwork

Your home's "envelope" or shell is made up of your walls, ceilings, floors and windows. These components are supposed to prevent air from moving through them. During winter, heated air should stay inside the building and cold air should be prevented from coming in, and vice-versa during summer. Unfortunately, most homes are not built as well as they could be and air leaks abound. In fact, over 90% of all homes have hidden air control problems.

Many air leaks are commonly referred to as "drafts." Air leaks around doors and windows are mistakenly assumed to be a major source of wasted energy but they may represent less than 20% of your home’s leakage. However, the most significant air leaks are hidden in your basement, attic, or crawlspace. Uncontrolled air leaks can cause unwanted heat flow between conditioned and unconditioned spaces. These are the "bad-air" leaks that often send your utility bills through the roof.

A typical duct system loses up to 25-40% of its heating and cooling energy through a combination of conduction and air leakage. Leaky ductwork can account for 10-30% of total heating and cooling costs! This makes home sealing is one of the most cost-effective ways to make your home more energy efficient.