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• <br /> • <br /> y WoodWorks'° <br /> WOOD PRODUCTS COUNCIL <br /> J <br /> Fire Design of Mass Timber Members <br /> Code Applications, Construction Types and Fire Ratings <br /> Reard McLain,PE,SE•Senior Technical Director•Wood Works <br /> Scott Breneman,PhD,PE,SE•Senior Technical Director•WootWo*s <br /> For many years, exposed heavy timber framing elements the country are leveraging to create innovative designs <br /> have been permitted in U.S.buildings due to their inherent with a warm yet modern aesthetic,often for projects that <br /> fire-resistance properties.The predictability of wood's char go beyond traditional norms. <br /> rate has been well-established for decades and has long been <br /> recognized in building codes and standards. This paper has been written to support architects and <br /> engineers exploring the use of mass timber for commercial <br /> Today,one of the exciting trends in building design is the and multi-family construction. It focuses on how to meet <br /> growing use of mass timber—ie., large solid wood panel fire-resistance requirements in the International Building <br /> products such as cross-laminated timber(CLTI and nail- Code (IBC), including calculation and testing-based methods. <br /> laminated timber(NLTI—for floor,wall and roof construction. Unless otherwise noted, references refer to the 2018 IBC. <br /> Like heavy timber, mass timber products have inherent <br /> fire resistance that allows them to be left exposed and still Mass Timber & Construction Type <br /> achieve a fire-resistance rating. Because of their strength and <br /> Before demonstrating fire-resistance ratings of exposed <br /> dimensional stability,these products also offer an alternative to <br /> mass timber elements, its important to understand under <br /> steel, concrete, and masonry for many applications, but have a what circumstances the code currently allows the use of <br /> much lighter carbon footprint.It is this combination of exposed mass timber In commercial and multi-family construction. <br /> structure and strength that developers and designers across <br /> A building's assigned construction type is <br /> the main indicator of where and when all <br /> wood systems can be used. IBC Section 602 <br /> defines five main options(Type I through VI <br /> with all but Type IV having subcategories A <br /> g and B.Types III and V permit the use of wood <br /> aq ( 5 s{! framing throughout much of the structure and <br /> Tft F# both are used extensively for modern mass <br /> ,„ ? } I + tt timber buildings. <br /> lit iCh <br /> �te lir! Type IIIyBC 602.3)-Timber elementscan <br /> y be used in floors, roofs and interior walls. <br /> s ! r *jiljt Fire-retardant-treated wood(FHTWI framing <br /> s r 3� is permitted in exterior walls required to have <br /> `- y a fire-resistance rating of 2 hours or less. <br /> a <br /> 1 <br /> yfil" -. Type VIIBC 602.51-Timber elements can <br /> t u*------._ be used throughout the structure,including <br /> . <br /> Wig. _ floors, roofs and both interior and exterior <br /> '•+'P walls, <br /> rrv9 Y tit L JS <br /> •" H' Type IV(IBC 602.41-Commonly referred to <br /> a .u as"Heavy Timber'construction,this option <br /> `" ' 'k has been in the building code for over a <br /> Pero:4ode*Pogue <br />