TL;DR
Firestopping is the sealing of openings and joints in fire-resistance-rated walls and floors — around pipes, conduits, ducts, and cables — with tested systems of intumescent caulks, collars, wraps, and mortars that restore the assembly's rating where the penetration breached it. Each seal must match a listed design (UL or equivalent) for the specific penetrant, opening size, and wall type, not just any red caulk smeared in a hole.
What it means
Firestopping is the sealing of openings and joints in fire-resistance-rated walls and floors — around pipes, conduits, ducts, and cables — with tested systems of intumescent caulks, collars, wraps, and mortars that restore the assembly's rating where the penetration breached it. Each seal must match a listed design (UL or equivalent) for the specific penetrant, opening size, and wall type, not just any red caulk smeared in a hole. Inspectors check it in townhouse party walls, garage-to-house separations, and commercial shafts.
Where it sits in the glossary
Firestopping 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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