TL;DR
Attic air sealing is the closing of leaks in the attic floor plane, top plates, wire and pipe penetrations, recessed lights, chimney chases, and the attic hatch, before insulation is added or topped up. The attic deserves first attention because stack effect makes the highest ceiling plane the strongest exhaust point for heated indoor air, and blown insulation alone does not stop airflow.
What it means
Attic air sealing is the closing of leaks in the attic floor plane, top plates, wire and pipe penetrations, recessed lights, chimney chases, and the attic hatch, before insulation is added or topped up. The attic deserves first attention because stack effect makes the highest ceiling plane the strongest exhaust point for heated indoor air, and blown insulation alone does not stop airflow. Crews use foam, caulk, rigid blocking, and metal flashing with fire-rated sealant at flues. Skipping the step is the main reason added insulation underdelivers, and weatherization programs treat it as prerequisite work.
Where it sits in the glossary
Attic air sealing is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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