Residential · IRC 2021 §R1001.11
Fireplace Clearance to Combustibles
Masonry fireplace airspace: 2 in to framing at front faces and sides, 4 in at the back, plus mantel and trim limits near the opening (6 in clear, 1/8 in projection per 1 in).. Referenced to IRC 2021 §R1001.11.
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