8/6/2020 MASS TIMBER BUILDINGS AND THE IBC 1 Introduction to Mass Timber Products DES620 James B. Smith, P.E. Midwest Regional Manager American Wood Council 2 2 Copyright © 2020 American Wood Council. All rights reserved. 1 8/6/2020 Disclaimer (Required by our lawyers) This presentation is intended to provide general information only and does not constitute professional or engineering advice. No participant or user should act on the basis of any material contained in the presentation without obtaining proper professional advice specific to their situation. Further, the views expressed by speakers or other third parties are those of the speaker or third-party and not, necessarily, of AWC. 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All rights reserved. 3 8/6/2020 Description This presentation will provide an overview of mass timber which includes any product currently permitted for use in Type IV (heavy timber) construction such as cross‐laminated timber (CLT), structural composite lumber (SCL), glued laminated timber (glulam), mechanically laminated decking (a.k.a. nail‐ laminated timber or NLT), and large section sawn timbers. NLT, glulam, SCL, and solid sawn timbers have been adopted in the International Building Code (IBC) and utilized throughout the world for several decades on a wide variety of buildings. CLT was first incorporated in AWC's 2015 National Design Specification® (NDS®) for Wood Construction as well as ICC’s 2015 International Building Code (IBC). All mass timber products offer sustainable qualities as they are manufactured from a renewable resource and store carbon. Structural and fire protection characteristics of mass timber will be discussed as well as IBC code provisions that allow their specification in both residential and commercial applications for a wide variety of occupancies. Mass Timber and the IBC 7 7 Learning Objectives • Identify code acceptance of mass timber products. • Describe technology advances and standards related to mass timber products. • Recognize the unique fire resistive characteristics of mass timber as it influences the use of wood in building construction. • Describe the application of NDS Chapter 16 which can be utilized to design up to 2‐hours of fire‐resistance for exposed wood members. Mass Timber and the IBC 8 8 Copyright © 2020 American Wood Council. All rights reserved. 4 8/6/2020 You are here Mass Timber Series • Module 1 Introduction to Mass Timber Products • Module 2 What’s New in 2015/2018 IBC for Mass Timber Construction? • Modules 3-6 Tall Mass Timber Construction per 2021 IBC • Module 3 Part 1: Background and Overview • Module 4 Part 2: Heights & Areas and Construction Fire Safety • Module 5 Part 3: Fire Safety • Module 6 Part 4: Fire and Connection Design and Special Inspection Mass Timber and the IBC 9 9 PARTICIPATION • Use the chat box to ask questions … Enjoy! Have Fun! Ask Questions! 10 Copyright © 2020 American Wood Council. All rights reserved. 5 8/6/2020 Poll Question #1 1. What is your profession? a) Architect b) Engineer c) Code Official d) Fire Service e) Builder/Manufacturer/Other Mass Timber and the IBC 11 11 Standard for Engineered Wood Design Mass Timber and the IBC 12 12 Copyright © 2020 American Wood Council. All rights reserved. 6 8/6/2020 Outline . Introduction to Mass Timber Products . Various Types of Mass Timber Products . Code Acceptance . Technology . Application . Concepts of Fire Resistance Design Mass Timber and the IBC 13 13 Introduction to Mass Timber Products What are all these acronyms? • Sawn Lumber • Heavy Timber – HT • Glued Laminated Timber • Beam or column – Glulam • Floor or roof slab – GLT • Mechanically Laminated Decking • Nail-Laminated Timber – NLT • Dowel-Laminated Timber – DLT • Structural Composite Lumber – SCL • Laminated Veneer Lumber – LVL • Parallel Strand Lumber – PSL • Laminated Strand Lumber – LSL • Oriented Strand Lumber – OSL This Photo by Unknown Author is licensed under CC BY-ND • Cross-Laminated Timber –CLT • Mass Plywood Panels –MPP Mass Timber and the IBC 14 14 Copyright © 2020 American Wood Council. All rights reserved. 7 8/6/2020 Traditional Stick Frame Construction Mass Timber and the IBC 15 15 Mass Timber Elements are NOT Light-Frame <‐‐> … but Mass Timber elements can be used in all construction types Mass Timber and the IBC 16 16 Copyright © 2020 American Wood Council. All rights reserved. 8 8/6/2020 Where is Mass Timber Allowed in the IBC? • Types I & II – generally noncombustible inside and out • Heavy Timber allowed for limited roof applications in Type I‐B & Type II • Type III – noncombustible exterior walls, but interior any material • Types IV & V – generally combustible • Type V includes any material permitted LeMay – America’s Auto Museum – Tacoma, WA Courtesy of APA‐The Engineered Wood Association Mass Timber and the IBC 17 17 ONLY Mass Timber combustible elements can be used for Tall Mass Timber Buildings Types IV‐A, IV‐B, and IV‐C in the 2021 IBC Mass Timber and the IBC 18 18 Copyright © 2020 American Wood Council. All rights reserved. 9 8/6/2020 Minimum Sizes for Mass Timber Spelled out in 602.4 and 2304.11 Table 2304.11 MINIMUM DIMENSIONS OF HEAVY TIMBER STRUCTURAL MEMBERS Min. Nom. Solid Sawn Min. Glulam Net Size Min. SCL Net Size Size Supporting Width (in.) Depth (in.) Width (in.) Depth (in.) Width (in.) Depth (in.) Floor or 8 8 6¾ 8¼ 7 7½ Floor/Roof 6 10 5 10½ 5¼ 9½ 6858¼ 5¼ 7½ Roof Only 6656 5¼ 5½ 7 4636/8 3½ 5½ • CLT minimum thicknesses • Floors – 4” actual • Roofs – 3” nominal • Exterior Walls in Type IV – 6” with limitations (see 602.4.2) Mass Timber and the IBC 19 19 What is Allowed by Codes? • Sawn Lumber (Timbers) • Glued Laminated Timber • Mechanically Laminated • Nail-Laminated Timber (NLT) • Dowel-Laminated Timber (DLT) • Structural Composite Lumber (SCL) • Laminated Veneer Lumber (LVL) • Parallel Strand Lumber (PSL) • Laminated Strand Lumber (LSL) • Oriented Strand Lumber (OSL) • Cross-Laminated Timber (CLT) • Mass Plywood Panels (MPP) Mass Timber and the IBC 20 20 Copyright © 2020 American Wood Council. All rights reserved. 10 8/6/2020 Sawn Lumber (Timbers) • Beams and Stringers • Posts and Timbers Butler Building – Minneapolis Courtesy of WoodWorks Mass Timber and the IBC 21 21 Code Acceptance . Grading practices and identification shall comply with rules published by an agency approved in accordance with the procedures of DOC PS 20 or equivalent . IBC 2301.1.1 Photo Courtesy of Bensonwood Mass Timber and the IBC 22 22 Copyright © 2020 American Wood Council. All rights reserved. 11 8/6/2020 Code-referenced Standard . National Design Specification for Wood Construction . Design Values Supplement Mass Timber and the IBC 23 23 Sawn Lumber Design: 2018 NDS 1. General Requirements for Building Design 2. Design Values for Structural Members 3. Design Provisions and Equations 4. Sawn Lumber 5. Structural Glued Laminated Timber 6. Round Timber Poles and Piles 7. Prefabricated Wood I-Joists 8. Structural Composite Lumber 9. Wood Structural Panels 10. Cross-laminated Timber 11. Mechanical Connections 12. Dowel-Type Fasteners 13. Split Ring and Shear Plate Connectors 14. Timber Rivets 15. Special Loading Conditions 16. Fire Design of Wood Members Mass Timber and the IBC 24 24 Copyright © 2020 American Wood Council.