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Fire-Resistance Rating Requirements Interior nonbeadng walls and partitions generally do not <br /> r most building elements other than heavy timber, passive have a fire-resistance rating requirement, except for Type IV <br /> nesistive requirements are in the form of a required fire- <br /> to In IBC 2015, note that the Table 601 reference <br /> tance rating (FRR).The IBC defines FRR as the period of to Section 602.4.6 should instead be to 602.4.8,which <br /> requires partitions in Type IV construction to be of solid <br /> time a building element component or assembly maintains <br /> wood construction or have a 1-hour fire-resistance rating. <br /> the ability to confine a fire, continues to perform a given <br /> structural function, or both,as determined by the tests, Other FRR Requirements <br /> or the methods based on tests,prescribed in Section 703. In addition to requirements related to construction type, <br /> FRR based on Construction Type there are other requirements for fire-resistance ratings in <br /> The construction type of a building determines many of the the IBC. For multi-unit residential buildings, walls and floors <br /> between dwelling or sleeping units are required to have a <br /> minimum required fire-resistance ratings for different building <br /> components,as shown in IBC Table 601. fire-resistance rating of 1/2 hour in Type II-B, Ill-B and V-B <br /> construction when sprinklered throughout with an NFPA 13 <br /> A couple features of this table are relevant to mass timber, system, and 1 hour for all other construction types(IBC 420, <br /> 708 and 7111. Multiple separated occupancies(IBC 508.41, <br /> Footnote c allows for timber components meeting the incidental uses(IBC 5091,and special provisions(IBC 5101 <br /> requirements of heavy timber to be used in the construction also require fire-resistance ratings of select components <br /> of all roofs having a fire-resistance rating of 1 hour or less in and assemblies. <br /> lieu of the required fire-resistance rating.This means that a <br /> mass timber roof meeting the minimum size requirement of <br /> heavy timber can be used in construction Types I-B, I I-A and <br /> II-B which otherwise prohibit the use of combustible framing. <br /> TABLE 3: <br /> ire-Resistance Rating Requirements for Building Elements (Hours} <br /> y 14 1t* al' F6 B ',a. B "'tor B , ,, tit ) M+;aF Ih <br /> Primary structural frame' 3a° 24° 1° 0 10 0 HT 1° 0 <br /> (see Section 202) <br /> Bearing walls <br /> Exterior' 3 2 1 0 2 2 2 1 0 <br /> Interior 3, 2' 1 0 1 0 1/HT 1 0 <br /> Nonbearing walls and partitions See Table 602 <br /> Exterior <br /> Nonbearing walls and partitions See Section <br /> 0 0 0 0 0 0 0 0 <br /> Interior° 2304.11.2 <br /> Floor construction and <br /> associated secondary members 2 2 1 0 1 0 HT 1 0 <br /> (see Section 202) <br /> Roof construction and <br /> associated secondary members 1-1/2° 1°, 1°` 0, 1°' 0 HT 1°, 0 <br /> (see Section 202) <br /> Source IBC Table 601/See IBC for footnotes <br /> tie <br />