O-1954-476 - Laserfiche WebLink

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, I -36- ~.. (a) Fire walls <.lIld party walls of masonry shall be laid in Type A or It Type B mortar. (b) Fire ?lalls end party walls shall be constructed of solid masonry units, or of hollow masonrjl' units faced on each side wi.th brick, or of reinforced concrete. (c) Where structural members project into hollOW' masonry units the ho11O''vrall and 4 inches or more a:>ove, bet\veen and belm" such members. 2. THICKHESS OF an.ID MASONRY WALLS EXCEPT PANEL 1'VALLS. (a) For b'ls1ness buildings and storage buildings, fire walls and party l'falls of solid masonry unitH shall be not less than 16 inches thick for the upper- --', , most !io :reet and increase 4 inches in thielmess :ror each additional 3!i :reet or f'rac- tv .~ion thereof measured dowmverd from the top of the wall; except that where the walls are non-bearing, or where beams or girders are supported on the vvall by approved Iletal hangers and do not enter the wall the minimum thiclmess may be 16 inches for ihe uppermost 70 feet. (b) For other buildings, fire walls and party walls of solid masonry units shall be not less than 12 inches thick for the uppermost 35 feet and increase 4 inches in thickness for ea::h additional 35 feet or fraction thereof measured dmm- '\Irard from the top of the wal:L. 3. TEICKN1SS OF BlUCK-FACED HOLLaV MASONRY VfALLS. Fire walis and party , walls of hollow masonry unitB faced on each side with at least 4 inches of brick shall have a total thiclmess including the facing not less ~an 4 inches greater >,. than specified in subsection 2 above f or so~id masonry walls. t ~ -" 4. THICKNI::SS OF Rl!:mFORCED CONCRETE W'ALLS EXCEPT PANEL WALLS. (a) For business 't:uildings and storage buildings, fire walls and party wcLlls of reinforced concrete shall be not less than 11 inches thick for the uppermost 3~: feet and increase 2 inches in thiclmess for each successive 35 feet or fraction tt..ereof measured downward from the top of the wall. (b) For other buil:lings, fire walls and party walls of reinforced con- crete shall be not less than 9 inches thick for the uppermost 35 feet and increase 2 inches in thiclmess for eac:1 successive 35 f'eet or fraction thereof measured dO'l'IIlward from the top of the lVall. 't 5. EXCEPTION TO THICKNESS REQUmEMENTS FCR PANEL \VALIS. 'Where fire vlallS or party walls are constructec~ as panel walls in a framew'ork of colu.ms and girders protected as required for fireproof construction and no panel has a height between supports greater than 12 feet, they may be of solid masonry not less than 12 inches thi.ck or of re:i.nforced concrete not less than 8 inches thick.