What is air sealing?This is the latest trend in building performance. Air sealing means we make your home air tight to control energy loss, moisture intrusion, and air quality. The most important step in air sealing is to seal the attic deck. In the typical home there are dozens if not hundreds of cracks, gaps, and holes in the attic deck that allow air to pass between the attic and your living space.
- Can lights
- Bathroom vents
- Chimney chase
- Attic hatch
- Plumbing penetrations
- Electrical penetrations
- Video projectors, Video screens
- Architectural Features
- Wall top plates
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Why do walls leak air?Any penetration through the sheetrock of the wall lets air into the wall cavity.
- Electrical outlets
- Light swtiches
- Phone or data connections
- Picture mounts
What causes air movement?Air is forced in and out of your home through air leaks by these pressure sources:
WindWind creates positive pressure on one side of your house and negative pressure on the other side. In Southern California we regularly experience Santa Ana Winds and onshore breezes.
Stack effectIn summertime stack effect can be a major issue. Air conditioned air is cold and heavy. It collects in the downstairs and builds pressure to exit your home. At the foundation level there are often a variety of leakage pathways. As cold air pours out the bottom of your house, it sucks hot air into the house from the attic.
Convective loopsInterior walls are usually hollow. This confined space creates a convective loop that absorbs energy from your living space and carries it away.
Shock wavesEvery time a door is opened or closed it creates a pressure shock wave through your home. This pressure is relieved by air leaking in or out of your home. Consider these four factors and it becomes clear there is A LOT of air that leaks in and out of your home, carrying your energy and money with it.
How do we air seal my home?The answer is foam, and do the attic first. Of course there are other methods, but spray foam is the most economical, practical, and effective.
Foam in the atticStep 1: Remove attic insulation and clean the attic deck. Step 2: Prep the attic by draping and taping where needed. Step 3: Install a layer of open cell foam to cover the entire attic deck.
WeatherizationSeal exterior doors and windows Seal around flooring
Foam in wallsFoam insulation may be injected into your exterior and interior walls. Foam creates air-tight insulation in your wall and prevents air movement through the cavity.
Air leaks in the atticAttics are the most common location for air leaks. Plumbing and electrical wires leave a path that air can pass in and out of your living space through the attic. Attic air is probably the most unhealthy air in your home.
The best solution:
- Remove existing fiberglass or cellulose insulation
- Spray a layer of foam covering the entire attic
- Foam is great insulation and also an air barrier