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C � <br /> MASONRY FIREPLACE REQUIREMENTS <br /> (summary only) <br /> l. Footings: 12" thick, 6" projection, 3, 000# concrete <br /> 2 . Wall Thickness: firebox 8", smoke chamber 8" , chimney 4" <br /> 3 . Hearths: 18" front projection, 12" side, 4" thick <br /> 4 . Firebox Depth: 20" or composite of 38" with hearth <br /> 5. Firebrick: 2" minimum depth, 1/4" maximum mortar joint <br /> 6. Clearance to Combustibles: 2" inside structure, 2" outside <br /> 7. Outside Air Intake Supply: to front of firebox <br /> 8 . Around Fireplace Opening: 6" minimum, 12" maximum, <br /> combustible materials may project 1/8" for each 1" of <br /> clearance. <br /> 9 . Chimney Height: 2 ' above any part of structure within 10' <br /> 10. Flue Size: 1/l0 of fireplace opening <br /> 11. Refractory Mortar: ASTM C105 in chimney and firebox <br /> 12 . Exterior brick applications must be a severe weather rated <br /> material. <br /> Call 472-0600 for INSPECTIONS <br /> (Rev. 3-29-95) <br />