Where Air Leaks Commonly Appear Around a House
Knowing where air commonly escapes helps homeowners understand why insulation and air sealing are often planned together.
Air leakage is rarely limited to one obvious opening. Many small gaps can combine to affect comfort throughout a building.
Attic penetrations
Wiring holes, plumbing stacks, ceiling fixtures and attic hatches are common leakage points.
Rim joists
The band area around the floor system can contain joints and transitions that are difficult to seal with rigid materials alone.
Wall and floor connections
Gaps may appear where framing meets foundations, roofs or additions.
Mechanical openings
Vents, ducts and service lines need compatible sealing methods that preserve required clearances.
Windows and doors
Frames can leak even when the units themselves are in good condition. Exterior flashing and interior seals should both be checked.
Use inspection, not guesswork
Smoke tools, pressure testing and thermal imaging can help identify problem areas before work begins.
