Footing: min. 12" thick; extend 6" min. beyond firebox or chimney masonry.
Fireplace size: 20"dx30"h (typically)
Hearth: min. 4" thick
Back wall: 2" min. firebrick lining & 8" min. solid masonry with lining.
Side walls: 10" min. solid masonry without lining.
Flue damper: 4" min. opening at 8" above top of fireplace opening.
Clearance from combustibles: 2" min. at interior, 4" min. at exterior
Opening clearance: no combustible material within 6" of opening, max 1/8" projection for each 1" away from opening.
Side clearance: Combustible material at side can project 1 1/2"
Chimney termination: above nearest roof surface within 10', or 2' above ridge.
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