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704.2.2-704.4.1 _ ed in steel frames. There is no restriction on the total TABLE 704.2.4 = " I number of such panels in any barrier. FIRE RESISTANCE RATING OF EXIT ACCESS CORRIDORS = i - Exception: Smoke barriers in Group I Restrained OCCUPANCY OCCUPANT FIRE RESISTANCE _ __ occupancies shall be permitted to be constructed of LOAD RATING(hours) _ � = minir�um 0.10 inch(2.5 mm)�thick steel. Sprinklered Unsprinklered ° _ 704.2.2 Partition requirements by occupancy A,s,r,tv1,S less than 30 0 0 = __ 704.2.2.1 Group I Restrained A 30 or more t 1 = : 704.2.2.1.1 Smoke barriers shall be constructed in B,F,M,S 30 or more 0 t = _ accordance with 704.2.1.5. R1,R2,R3 less[han 10,Note I 0 0 = Rl,R2 10 or more,Note 1 1/2 1 = 704.2.2.1.2 All interior partitions in Type I and Type R.4 16 or less o '0 _ II construction shall be of noncombustible construc- R4 more than 16,Note 1 0 '� 5 tlOri. E Note 2 1 l ° I Unrestrained All 0 N/A '" - = I Restrained All 0 0,Note 3 = 704.2.2.2 Gro�p T Unrestr�ined.Smoke barriers sllall H A(I ► 1 ' _ have a minimum 1-hour fire resistance rating and be = = constructed in accordance with 704.2.1.5. Notes: ' _ 1. Corridors within guest rooms or dwelling units need not be ratcd. = = 704.2.2.3 Group R Residential. NOIIf1I'e I1te(� PBIti- 2. Corridors need not be rated in Group E occupancies with rooms used = = tions may be constructed w1[h1n small residential ei�her for instruction with at]east one exit cloor directiv to the exte- _ = iior at ground level or for assembly purposes with at least one-half of = _ care/assisted living faCllltles (Group R4 Sm811 t e require exus directly to the exterior at ground leve. = Facility), one and two family dwellings and within 3. 't1nSj�nn ere use condition s�a ave exit access c cridors of i- _ individual dwelling units unless required by Table 600. .hour fire resistance. : The tenant separation in a two family dwelling shall comply with 704.3. 704.3 Tenant Cre separation _ - 704.3.1 In a building or portion of a building of a single _ Exception: Shaft enclosures in Group R4 occupan- occupancy classification, when enclosed spaces are pro- ' _ cies shall be enclosed and protected in accordance vided for separate tenants, such spaces shall be separated � = with the requirements of Table 705.1.2. by not less than 1-hour fire resistance. 704.2.3 Partitions within tenant space Exception: In Group B and Group S occupancies,par- 704.2.3.1 Partitions dividing portibns of stores; offices titions not rated for fire resistance may be used to sep- or similar places occupied by one tenant only,which do arate tenants provided no area between partitions rated not establish an exit access corridor serving an occu- at 1 hour or more exceeds 3,000 sq ft(278.7�m2). pant load of 30 persons or more, and partial partitions, may be temporary or permanent and constructed in 704.3.2 In buildings with usable crawl spaces, tenant sep- accordance with 609 without fire resistance, provided aration walls required to have a fire resistance rating shall that; extend from the underside of the floor to th'e ground 1. Their location is restricted by their method of below. A suitable foundation shall be provided at grade construction or by means of permanent tracks, level. guides or other approved methods. 2. Flammability shall be limited to materials having Exception: The wall need not be extended��vhen the an interior finish classification as set forth in iloor above the crawl space has a minimum 1-hour fire * Table 803.3 for rooms or areas. resistance rating. = 704.2.4 Exit access corridors. Fire resistance rating of 704.4 Townhouse fire separation _ exit access corridors shall be in accordance with Table 704.4.1 Each.townhouse shall be considered a separate _ 704.2.4. building and shall be separated from adjoining iownhous- es by a party wall complying with 704.4.2 or by!the use of separate exterior walls meeting the requirements of Table 600 for zero clearance from property lines as required for the type of construction. Separate exterior walls shall include one of the following: 1. A parapet not less than 18 inches (457 mm) above —� the roof line. 2. Roof sheathing of noncombustible mate'rial or fire � retardant treated wood,for not less than a 4 ft(1219 1+ � 92 STANDARD BUILDING CODE°1997