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· One and Two Family Dwelling Code <br /> <br /> Table No. R-903.1 <br />REQUIREMENTS FOR MASONRY FIREPLACES AND CHIMNEYS <br /> <br />ITEM LETTERt REQUIREMENTS <br />Hearth slab thickness A <br />Hearth extension B 8" lireplw-'e ,opcnm[z < 6 ',q I't <br />(each side of openingl 12" firepla~.'c o~nmg -~ 6 ~q. N. <br />Hearth extension C 16" l~repWcc ol~mng < <br />(fronlol'o~ning) ~ l~rcplace*pcn <br />Hearth slab reinforcing D Reinforced Io cart5 ~s o~n ~etght and all <br />~ickness of wall o[ firebox E 10" common brick or 8" ~herc a firebrick <br /> linin~su~cd Join~inlirebrick ~"max. <br />Distance from top of o~nin~ to throal F <br />Smoke cham~r edge ot' shell' G <br />Rear walt--Wickness 6" <br />Front and sidewall~hickness <br />Chimney H Four No 4 lull-lent:th bars <br />Vertical R~inforcing 40" ~tde Add t~o No 4 bars fo* each <br /> addmona] 40" or <br /> addimmal fWe <br />Horizontal reinforcing I ~ 4"t~c~ at 18" and t~o ~c~ al each bend m <br /> ~crlicul ~tecl <br />Bond beams K No x~c'H ~cd rcqutrcmcnt~ <br />Fireplace lintel L Noncombustible <br />Walls with flue lining M Brick ~ ith ~rou~ around hmn~ <br /> from flue lining lo outside lace ol chunne} <br />Walls with unlined flue N 8" solid musonrv <br />Distances ~tween adjacent flues See Sectio0,' ~-~1.9 ...... . <br />Effective flue area (based on area of P Round lining--~q 2 or 50 sq. m mm <br />fireplace o~ning) Rectangular lining--" m or 64 sq m mm <br /> Unlined or lined ~i~}~ firebrick-- <br />Clearances R <br />W~ frame See Sections R-~I,I 3 and R-~3.7 <br />Combustible material See Section R-~3.9 <br />A~ve ~f 2' at 10' <br />Anchorage S <br />Numar 2 <br />Em~dment into chimney 12" hm~ked around outer bar w/6" <br />Fasten to 4 joists <br />Bolts Two ~/2 diame er, <br />~ting T <br />~ickness 12" min. <br />Width 6" each side of fireplace wall. <br /> <br /> <br />