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Minimum spacing of roof sheathing to chimney


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I can't seem to recall what the minimum spacing allowed for roof sheathing to a chimney/metal vent. Today, I saw plywood directly up against a wood burning fireplace's chimney and called it out as a potential pyrolysis and fire hazard, but can't recall the exactly minimum requirement. Is it 2" min spacing b/w chimney and framing or plywood?

Believe it or not, the seller also had plywood nailed up against the chimney in the garage as well.

Thanks in advance.

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