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1994 UNIFORM BUILDING CODE 50f�509.1 <br />See Chapters '� and 4 for s fecial occupancy pro . sio s. <br />SECTION 507 — MEZZANINES <br />A mezzanine need vot bc counted as a story for dctermining thc ailowable numbzr of srories when <br />constructed in acwrdance with Uie folluwing: <br />1. The construction of a mezzanine shall bc consistent with thc requirements for the type of con- <br />struction in which the mezzanine is located, but the fire-resistive time period need not exceed one <br />hour for unenclosed mezzanines. The clear height above and bclow [he mezzanine (loor consiruc- <br />tion shall not be less than 7 ket (2134 mm). � � � <br />2. Tharc shall not be more than two levels of inezzanines in a room. However, thr.re is no limiia: <br />tion on thc number of inezzanines within a room. . <br />3. The aggrcgate arca of inezzunines within a room shail not exceed one third of the arca of �he <br />room in which they are located. � � <br />3. All ponions of a mezzanine shall be open an�1 unobstructed to Ihe room in which lhey are lo- <br />cared, exeept for columns snd posts and protutive walls or railings not morc than 44 inches Q I l8 <br />mm) in height. � . . . _ - . . <br />. EXCEPTIONS: 1. Vartitioning may bc installcd if either of lhe following conditions ezist: ; <br />. 1.1 The aggrcgate floor area of the encioscd space does not uceed �0 percent of �he mcuanine erca <br />1.2 The occupant load of lhe enclosed area of lht mezz�rine does not exceed 14 . • <br />2. A mezzanine having �wa or morc eaits need nol be open inlo �he room in xhich it is laaled, pmvidcd <br />al leas[ one of the ezils gives dircci attess to a promcled exii cortidor, an eait coun, enclosed esit stairway, <br />catcrior czil, ulcrior exit balcony or exi� passageway. <br />3. In industry (aciliiic's, mezzanines used (or comrol equipmen[ may be gla:ed on all sides. <br />5. 7'wo exit: shall be provided from a mezzanine when two exits are required by Table 10-A. <br />6. ICany required exit enters the room below, the occup�nt load of the mezzanine shall be added <br />to the occupant load of the room in which it is located. <br />SECTION 5Q8 — FIRE-fiESISTIVE SUBSTITUTION <br />\Vhen an approved automatic sprinkler system is not required throughout a building by other sec- <br />tions of ttii� code, it may be used in a building of T}•pe II One-hour, Type II1 One-hour and Type V <br />One-hour construction to substiwce for the one-hour Fire-resistive consiruction. Such substimtion <br />shall not waive or reduce the required fire-resistive constmetion for. <br />l. Occupancy sep�rations (Section 302.3). � <br />2. cxterior wall protection due to prosimity o( propeny lines (Section 5031). <br />3. Area scparations (Section 504.6). <br />4. Dwelling unit separations (Scetion 310.2.2) <br />5. Shaft er.clesures (Section 71l). <br />6. Corridors (Sections 1005.7 and 1005.8). <br />7. Stair cnclosures (Scciion 1009). <br />8. Exit passageways (Section 101 LI ). <br />� 9. Typ: of conswction separation (Secrion 60L1). :- . � -- <br />-" � 10. 6oiler, centrai heatin� plant ot hot-water supply boiler room enclosures (Section 30'_'.5). <br />SECTION 509 — GUARDRAILS <br />509.1 �VhereRequired. Unenclosedtloorandroofopcnings,openandglazedsidcsofstainvays,: <br />landings and ramps, baiconies orporchts, which are more than 30 inches (762 mm) above grade or <br />floor bclow, and roo(s used for other than service of Ihe building shall be protected by a guardrail. = <br />1-89 <br />�5 <br />