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- �p3.�.� �Vood columns and arches. In Types III and iV construcuoa.�.;ooa�oiumns:uiu ai�rc� i - conformin�to heavy-timber sizes may be used extzmally when exterior walls are permicted to be • unprotected,noncombustible construction or�vhen one-hour tire-resistive noncombustible exteri- or walls are permi[ted. �03.�.� Group H Occupancies—minimum distance to property lines. Re�ardless of any other provisions,Group H Occupancies shall be sec back a minimum distance from propetty lines as set Torth in Items 1 throueh-�below.Discances shall be measured from the walls enclosinQ the occupan- cy ro all property lines.includin;those on a public way. 1. Group H.Division 1 Occupancies. No� less [han 75 fee�('_?860 mm) and not less than re- i quired by Table 3-F. i � 2. Group H.Divisions Z and�Occupancies.'Iot less[han 30 feet(91-�mm)When the area of the occupancy exceeds 1,000 square feet(93 m�)and it is not required ro be loca�ed in a detached build- ; ing. � 3. Group H.Divisions?and 3 Occupancies.�'ot less than�0 feet(15 ?=�0 mm)µ'hen a detached buildin� is required. See Table 3-F. �. Group H.Divisions 2 and 3 Occupancies containing materials wich explosive characteristics. _ Not less than the distances required by Table 3-F. �03din G reUuir d b,Table 31G,�there O no e quiremens tor wall and o�penin�prot ctioncb sed buil e q ; on locacion on propeny. � 503.�.7 Group H.Division-3 Occupancies. Group H.Division�l Occupancies having a floor area not esceedina�.500 square feet(232 m=)may have exterior bearing Walls of no[less than two-hour � fire-resistive conscruction when less than� feec(1�3=�mm) from a property line,and no[less than one hn�!r �,��h�^ le�s �'��n �0 fezt (6096 mm1 to a propertv lir.e. �03.-�.8 Group li,Division 1 Occupancies. ln Group U,Division 1 Occupancies,exterior walls that are required to be of one-hour tire-resistive construction due to locanon on propeny may be t procected only on the exterior side with mate�'als approved for one-hour tire-resistive construction. � ' � ' ' �. See Section �03. f �03.-1.9 Exterior wa(1 assemblies. Excerior wall assemblies complying with Section ?602.�.2 S mav be used in all types ot conscruccion. • SECTION 504—ALLOWABLE FLOOR AREAS _ �04.1 One-story Areas. The area of a one-story buildine shall not exceed the limits set Torth in Taole�-B except as provided in Section �0�. - �p:�? �,reas of Buildings over One Stor-y. The total combined floor area for multistory buildings :y mav be twice tha[permitted by Table�-B for one-story buildinQs,and the floor area of any singie � story shall not exceed that permitted for a one-scory bui]ding. : �04.3 :�llowable Floor?.rea of�Iixed Occupancies. When a building houses more[han one oc- � � cupancy,the area of the building shall be such that[he sum of the ratios of the acmal area for each ` separate occupancy divided by the rotal allowable area for each separate occupancy shall not ex- - ceed one. EXCEPTIOtiS: 1.The major occupancy classiFica[ion ot a building may oz used co determine the allow- c�Q18 ablz area of such building when the major use occupies not less than 90 percer[of the azea of any doo�of the 2V1`11MU building and pro�ided[hat other minor accessory uses shall not exceed the basic area perrnitted by Table�-B for such minor uses and that various uses are separated as specified in Seccion�02.4. ?.Groups B.F,�1 and S and Group H.Division 5 Occupancies complying wi[h the provisions of Section �05.2 may contain oeher occupancies pro�ided thac such occupancies do no�occupy more chan 10 percent of i [he area of any tloor of a buildine,nor more than the basic area permitted in the occupancy by Table�-B for i such occupancy,and further pro�ided that such occupancies are separated as specified in Section 302.4. � �04.�3 Vtezzanines. Unless considered as a separate story,the tloor area of all mezzanines shali be ?� s �included in calculatine the allowable floor area ot the stories in which the mezzanines are located_ Sp4.5 Basements. � basement need not be included in the total allowable area, provided such � basement does not exceed the area permitted for a one-story buildin�. � 50�.6 Area Separation Walis. 504.6.1 General. Each portion of a buildin�separated by one or more area separation walls which ^ comply with the provisions of this subsection may be considered a separate buildin�.The exten[and location of such area separation walls shall provide a complete separation. When an area separation wall also separates occupancies that are required to be separated by an � occupancy separation,the most restrictive requirements of each separation shall apply. - 4,6Z Fire resistance and openings. ?.rea separation walls shall not be lessehesisrive con- � �� I fire-resistive construction in Types I,II-F.R..III and IV buildings and two-hour Tir struction in Types II One-hour,II-N or V buildings.The total width of all openines in such walls shall not exceed 25 percent of the leneth of the wall in each story.All openinQs shall be protected by I a Fire assembly having a three-hour f re-protec[ion ra[ing in four-hour fire-resistive walls and one- % t � and one-half-hour fire-protection rating in two-hour fire-resistive walls. \ � c�s� Z F.ctensions hevond exterior walis. Area separation walls shall extend horizontally to the ,