TL;DR
Fire separation distance is the measured space between a building's exterior wall and the property line, the centerline of a street, or another building on the same lot, which the code uses to set how fire-resistant that wall must be and how many openings it may have. Under the IRC, walls closer than 5 feet to the line generally need fire-rated construction and face limits on windows; detached garages and sheds get their own thresholds.
What it means
Fire separation distance is the measured space between a building's exterior wall and the property line, the centerline of a street, or another building on the same lot, which the code uses to set how fire-resistant that wall must be and how many openings it may have. Under the IRC, walls closer than 5 feet to the line generally need fire-rated construction and face limits on windows; detached garages and sheds get their own thresholds. It is the rule that stops an addition or shed placement more often than any zoning setback.
Where it sits in the glossary
Fire separation distance 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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