What’s the Deal With Exfiltration?
Understanding why and how conditioned air exits a building is important for diagnosing performance problems
Just Say No to (Swiss) Cheesy Attic Floors
Ceilings with lots of air leaks are an invitation for moisture problems in winter
Air Leakage Through Spray Polyurethane Foam
How thick does a layer of spray foam insulation has to be to qualify as an air barrier?
Air Leaks From Your Home To Your Attic Need To Be Sealed
If your house has an attic, there needs to be an air barrier that keeps the attic space separate from the rest of the building
Fixing a Leaky Log Home
Rustic and charming as they may be, log homes pose unique challenges for air sealing and insulation
Air-Sealing an Attic
If you haven’t done it yet, it’s time to climb into your attic and plug as many holes as you can find
Blower Doors Have Become Essential
Use one to measure a building’s airtightness, to locate leaks, or to comply with a green building program
Heat Loss from Air Is No Big Deal, Right?
No — it's a huge deal, especially if your ceiling is peppered with recessed can lights
Who Knew the Stack Effect Could Be So Controversial?
Heat rises, and so does warm air
Blower Door Basics
An essential tool for building energy-efficient homes, a blower door can also help you find leaks in old houses