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TABLE 9: <br /> Interior Wall and Coiling Finish Requirements by Occupancy <br /> ° "I iote* Canulprs, ",xN r sand 4tterm6 f6pL ' r ' > dnd <br /> starvwysmM 1 barat eAclesedspasea 1 and ft -'enclbsedspe�& <br /> oampseS.* ' s r I(1lp npstndii ., .v. <br /> ... .aU:.*.u4 � ' andrmnps °� ' 1 ,.erornps <br /> A-1 &A-2 B B C A AI Br <br /> A-3',A-4,A-5 e B C A A° C <br /> B, E,M,R-1 B C C A B C <br /> R-4 B C C A B B <br /> F C C C B C C <br /> H B B Cs A A B <br /> I-1 B C C A B B <br /> -2 B e B"' A A B <br /> 1-3 A Ai C A A B <br /> 1-4 8 B B"' A A B <br /> R-2 C C C B B C <br /> R-3 C C C C C C <br /> 5 C C C 8 B C <br /> U No restrictions No restrictions <br /> Source:IBC Table 80311/See IBC for footnotes <br /> TABLE 10: <br /> Flame Spread Values for Common Mass Timber Species <br /> stz'*-tkt4 <br /> Douglas-fir ]0 80 B <br /> Hem-fir species group S0 70 B <br /> Pine,eastern white 70 110 B <br /> Pine,southern yellow 70 165 B <br /> Spruce,black 144hick,3layers 35 55 <br /> of cross laminations) 8 <br /> Source:DCA 1,AWC <br /> Conclusion <br /> The increased use of exposed mass timber in multi-family and commercial buildings has <br /> created a need for greater understanding of the fire design procedures of these types of <br /> structures. Under the 2018 IBC, many mass timber products are permitted and multiple <br /> design routes exist for demonstrating compliance with fire-related provisions of the building <br /> code.As wood members are exposed to fire and the wood begins to burn, a char layer <br /> is formed.The char layer acts as an insulator and protects the core of the wood section. <br /> Mass timber elements can be designed so a sufficient cross-section of wood remains to <br /> sustain the design loads for the required duration of fire exposure.This sets mass timber <br /> apart as a unique building material—one that is able to achieve structural performance and <br /> passive fire-resistance objectives for larger and taller wood buildings than ever before,while <br /> offering enhanced aesthetic value and environmental responsibility. <br /> is <br />