Types III and V permit the use of wood framing throughout much of the structure and both are used extensively for modern mass timber buildings. Structural Engineering. Per IBC Sections 602.4.1 and 602.4.2, exterior walls required to have a fire-resistance rating of 2 hours or less are also permitted to use FRTW framing, or CLT when covered with FRTW sheathing or noncombustible materials. For many years, exposed heavy timber framing elements have been permitted in U.S. buildings due to their inherent fire-resistance properties. It is available as a free download on the WoodWorks website, along with an Inventory of Fire Resistance-Tested Mass Timber Assemblies and Penetrations. The level of fire resistance required of a building is established by the building code and is a function of the size, use and occupancy of the building. The newer method is based on calculating the capacity of timber members exposed to fire and can be applied to all members of the structural frame. Structural fire design provisions have been incorporated in Chapter 16 of the NDS, which is referenced in Section 722.1 of the 2012 IBC as a method of calculating fire resistance of exposed wood members. There are several recognized methods of providing fire resistance using wood frame construction. Type IV (IBC 602.4) – Commonly referred to as ‘Heavy Timber’ construction, this option has been in the building code for over a hundred years in one form or another, but its use has increased along with renewed interest in exposed wood buildings. Unless otherwise noted, refers to the 2018 IBC. The use of calculated fire resistance for wood construction has gained prominence in recent years due to the increasing interest in mass-timber construction where the wood is left exposed as part of the architectural character of a building, yet falls outside of the criteria for the prescriptive Heavy Timber Construction. WoodWorks – Wood Products Council provides free technical support as well as education and resources related to the code-compliant design of commercial and multi-family wood buildings. For example, a 6 ¾” wide x 15” deep glulam floor beam trying to achieve 1 hour fire rating would have to be designed as 3 ¾” wide x 13 ½” deep glulam to account for 1 ½” reduction due to charring on each exposed side (assuming two sides and the bottom are exposed). It is this combination of exposed structure and strength that developers and designers across the country are leveraging to create innovative designs with a warm yet modern aesthetic, often for projects that go beyond traditional norms. This construction type is unique in that fire-resistive behavior is based in part on the inherent and long-demonstrated fire resistance of large solid wood framing. Goodfellow Bros. is a Proud Recipient of the World’s First Electric Drive Dozer manufactured... guide by Geometricbox for contacting WordPress support. Type V (IBC 602.5) – Timber elements can be used throughout the structure, including floors, roofs and both interior and exterior walls. Heavy Timber Construction, the traditional method, is included in the codes based on a long history of satisfactory performance; however, is limited in applicability to roof and column construction. Building Element Type I Type II Type III Type IV Type V A B A d B A d B HT A d For assistance with a project, visit www.woodworks.org/project-assistance or email help@woodworks.org. Selection of construction type for mass timber projects is one of the more significant design considerations. Similarly, a mix of occupancy groups doesn’t dictate that certain materials, construction types or building configurations are required. Learn where exposed timber fire resistive construction is allowed in the IBC. The fire-resistance of heavy timber construction is based on the inherent size of large timber elements. This means that a mass timber roof meeting the minimum size requirement of heavy timber can be used in construction Types I-B, II-A and II-B which otherwise prohibit the use of combustible framing. Like heavy timber, mass timber products have inherent fire resistance that allows them to be left exposed and still achieve a fire-resistance rating. Wood frame is an economical construction type and if properly detailed durable and fire-safe. Today, one of the exciting trends in building design is the growing use of mass timber—i.e., large solid wood panel products such as cross-laminated timber (CLT) and nail-laminated timber (NLT)—for floor, wall and roof construction. Heavy timber construction is slowly gaining ground for commercial, residential, and institutional buildings, such as the seven-story T3 office building in Minneapolis or the 18-story student residence at the University of British Columbia. New Study: Arkansas Highways Improve Significantly, Rank 9th in the Nation in Highway Performance... Joel Sheets of Tindall Corporation Appointed as Secretary/Treasurer of NPCA. Hill International to Provide Construction Support Services for LA Metro’s I-5 Improvement Project in... Corecon Technologies Releases Updated Estimating Module in its Cloud-Based Construction Software Suite, SCHRÉDER APPOINTS NEW GENERAL MANAGER – NORTH AMERICA, STEVE MILLS. The main differences between V-B and V-A are fire-resistance rating requirements and allowable building size. In IBC 2015, note that the Table 601 reference to Section 602.4.6 should instead be to 602.4.8, which requires partitions in Type IV construction to be of solid wood construction or have a 1-hour fire-resistance rating. This method was then incorporated into new design procedures of the 2001 National Design Specification (NDS) for Wood Construction. For example, a mass timber building may have isolated steel, concrete or masonry structural elements, but this doesn’t mean that Type I or II construction is necessary, nor does it mean that some or all of the building can’t be framed with mass timber. Interior nonbearing walls and partitions generally do not have a fire-resistance rating requirement, except for Type IV construction. The IBC defines FRR as the period of time a building element, component or assembly maintains the ability to confine a fire, continues to perform a given structural function, or both, as determined by the tests, or the methods based on tests, prescribed in Section 703. For example, if a building’s size permitted the use of Type V-B construction, it could still be completely framed with noncombustible materials while being classified as V-B. Learn the characteristics of Heavy Timber Construction 3. A couple features of this table are relevant to mass timber.Footnote ‘c’ allows for timber components meeting the requirements of heavy timber to be used in the construction of all roofs having a fire-resistance rating of 1 hour or less in lieu of the required fire-resistance rating. In all occupancies, heavy timber shall be allowed where a 1-hour or less fire-resistance rating is required. Before demonstrating fire-resistance ratings of exposed mass timber elements, it’s important to understand under what circumstances the code currently allows the use of mass timber in commercial and multi-family construction. The fire rating is driven by the need to provide ample time for occupants to exit the facility, retain structural stability long enough for fire-fighting personnel to combat the fire and for the protection of the contents of the building and adjacent structures. First of all, timber members can be protected from fire exposure by enclosing them within a fire-resistant assembly. Type III (IBC 602.3) – Timber elements can be used in floors, roofs and interior walls. 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heavy timber fire rating

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