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� <br /> ?Q4.3 Tenant Fire Separation <br /> . . <br /> , 704.3.1 In a building or portion of a building ;�f a single occupancy � <br /> ctassificatian, when enclased spaces are provided f�r separate tenants, such <br /> - spaces shall be separated by not less than 1-hour fir��resistance. <br /> EXCEPTION: In buildings of Group B and Cruup S occupancies, non- <br /> fire-rated gartitians may be nsed tp separate tenants provided no area <br /> between partitions rated at 1 hour ar more exceeds 3,000 sc} ft (27$.7 <br /> mz}. <br /> 744.3.2 Iu buildings with usable crawl spaces, tenant separatian walls <br /> required to have a fire resistance rating shall extend from the undersxde af <br /> the floar to the ground below. A suitable faundation shall be provided at <br /> grade level. <br /> EXCEPTION: The wall need nat be extended when the floor above the <br /> crawl space has a minimum 1-hour fire resistance rating. <br /> � 704.4 Townhouse Fire Separation <br /> : - <br /> = 7Q4.4.1 Each townhouse shall be cansidered a separate bui�ding �nd shall <br /> � <br /> � be separated from adjoiixing townhouses by a-party wall complying with <br /> �� � , <br /> � 7Q4.4.2 or by the use of separate exterior walls meeeing the requirements of <br /> � Table 600 for zero clearance from property lines as required for the type of <br /> S canstruction. Separate exterior wa11s shali inelude one of the follawing: - <br /> � 1. A parapet not less than 18 inches (457 mm) above the roof line. <br /> I = <br /> � 2. Roof sheathing of noncambustible material or fire retardant treated <br /> _ <br /> ' waod, for not less than a � ft {1219 rrun) width on each side of the <br /> � exterior dividing wall. � <br /> � 3. (Jne layer of 5/8 inch (15.9 mm) Type � gypsum baard attached to <br /> � <br /> = the underside of roof decking, for not less than a 4 ft {1219 mm) <br /> _ width on each side of the exterior dividing wall. <br /> - 4 704.4.2 When not more than three stories in height, townhouses may be <br /> separated by a single wall meeting the following requirements: � <br /> � 1. Such wall shall provide not less than a 2-hour fire resistance rating. <br /> Plumbing, piping, ducts, electrical or other building services shall not <br /> ,�, be installed within ar through the 2-hour wall, unless such materials <br /> and methads af penetration have been tested in accordance with <br /> -w ?OI.2. � <br /> 2. Such wall shall be continuous from the �oundation to the underside of <br /> ' the roof sheathing or s�all have a parapet extending not Iess than 1$ <br /> , inehes {457 mm) above the roof line. When such wall temunates at <br /> _ - the underside af the roof sheathing, the roof sheathing for not less <br /> ' = than a 4-ft (1219 mm) width on each side of the wall shall be of <br /> - noncombustible material, or fire retardant treated woad, or one layer <br /> = of 51$ inch (I5.9 mm} Type X gypsum wallboard attached to the <br /> = underside.of the roof decking. f <br />