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TABLE 5: <br /> Comparison of Construction Types III and IV:Group B Occupancy <br /> n:=ire kr , i n x <br /> ..,5 • <br /> Base allowable area per story" 85,500 108,000 Table 506.2 <br /> Allowable stories' 6 6 Table 504 4 <br /> Allowable building height' 85' 85' Table 504.3 <br /> 'NFPA 13 sprinklered throughout building per IBC Section 903.3 11 <br /> 2No frontage increase included <br /> Primary structural frame 1-hour HT <br /> Exterior bearing walls 2-hours 2-hours <br /> Interior bearing walls 1-hour 1-hour/HT <br /> Nonbearing exterior walls Table 602 Table 602 <br /> Nonbearing interior walls 0-hour 1-hour or per 602.4 8. 1 Table 601 <br /> Floor construction&associated 1-hour HT <br /> secondary members <br /> Roof construction&associated 1-hour' HT <br /> secondary members <br /> 3Note ability to use heavy timber in Type Ill-A roof construction in lieu of FRR Table 601 footnote c <br /> HT=Heavy limber—See minimum <br /> um wood member sizes per IBC 200119 2304.11(IBC 2015 602 4) <br /> W required in exterior walls Yes Yes(except OLT) Sections 602.3&602 41 <br /> CLT allowed in exterior walls No Yes with stipulations Section 602.4.2 <br /> Sections 602.3&2304.11.3 <br /> Concealed spaces in floor systems allowed Yes No4 1602.4.67 <br /> Exterior wall protections Any approved material Any approved material Section 705.2.2 <br /> Interior finish requirements Table 803.11 Exempt Section 803.3 <br /> Minimum roof covering classification B B Section 1505.1 <br /> 42021 IBC will allow concealed spaces in type IV-HT under certain conditions as noted <br /> New in the 2021 IBC: • <br /> at 2pt3a CCCa n�a "' , Itt ��� tad <br /> Concealed Spaces in tringesdlalagotntoefteciwtththe rIGC.Arongl <br /> P concealed spaces wit be permitted in Type N-FIT tte,avynmbec <br /> construction provided one or more of the measures are in ptao <br /> Type IV Construction wry- y 1.. <br /> nupertng isslumHmSdthrouQhopt"Iilt$ fmr .p <br /> d .a' -' n" ecorltN space 3t'If Murk "n t ' r <br /> "44 +` Coflt4tsorfSaJraming the cunceSd space am protected with <br /> 5/8-incltType X gypsum board l ' <br /> . <br /> . The concealed space is completely wdha <br /> eftOottlb <br /> �'' such aslplaVralw081 l„yfllaN„ <br /> 1 h' n,Y :N y The existing aHowaroe for stud cFare:yinight-frame waNs with a 1-hour <br /> fire-resistance rating is rewritten into an exception to the 2021 proyisiuns <br />