Wood Design & Building Magazine, vol 24, issue 95
Guide to Encapsulated Mass Timber Construction in the Ontario Building Code
The Guide to Encapsulated Mass Timber Construction in the Ontario Building Code – Second Edition is a comprehensive resource designed to help designers, code officials, and building professionals understand and apply the latest Ontario Building Code provisions for Encapsulated Mass Timber Construction (EMTC), effective January 1, 2025. Developed by the Canadian Wood Council / WoodWorks Ontario in collaboration with Morrison Hershfield (now Stantec), the guide explains the technical requirements, fire safety principles, and design considerations unique to EMTC, with clear references to relevant OBC articles. It covers everything from structural mass timber element specifications and encapsulation materials, to use and occupancy limits, mixed-use scenarios, and related provisions for structural design, environmental separation, and fire safety during construction. Intended to be read in conjunction with the Ontario Building Code, this is not a design guide, but rather a tool to distill complex regulations into practical, accessible information—equipping professionals to confidently design, review, and approve EMTC projects while ensuring compliance and optimizing performance. Notice of Correction: A previous version of this document contained a small error on page 19. In this electronic version of the document (updated August 12, 2025) the 3rd major bullet of Section 5.1.1 has been corrected.
Advanced Wood Construction Action Plan
The 2025 Ottawa Wood Solutions Conference will be presented on February 5, 2025 at the National Arts Centre
December 19, 2024 (Ottawa) – The 2025 Ottawa Wood Solutions Conference will be presented on Wednesday, February 5, 2025, from 8:00 am to 5:00 pm, at the National Arts Centre, located at 1 Elgin St. in Ottawa. First launched over 20 years ago to serve design and construction professionals interested in building with wood, this event has evolved from a niche gathering into a cornerstone of professional education, driven by the growing demand for sustainable wood construction. The program offers a range of presentations—from technical deep dives to inspiring case studies—catering to participants at every stage of their professional journey, from newcomers to seasoned experts. Attendees can also take advantage of valuable opportunities to connect, collaborate, and expand their professional networks within the wood community. Conference organizers are delighted to welcome Christophe Ouhayoun of KOZ Architects (France) to share insights into the innovative, collaborative development of the Paris Olympics Athletes’ Village. His presentation will also explore the current effort underway to convert these structures into much-needed permanent housing, highlighting this progressive mass timber development as a model of adaptability and sustainability. Another program highlight pays tribute to the venue itself. Donald Schmitt, CM, of Diamond Schmitt Architects will present on the revitalization of the National Arts Centre, offering a behind-the-scenes look at the timber structure and prefabrication process that transformed this iconic building into a modern landmark. Other technical presentations include managing sound and vibration in mass timber buildings and growing Canadian capacity for industrialized wood construction, advancing wood products in our changing climate, and a discussion of the value of conventional wood frame construction in small communities where it provides job opportunities, with a specific focus on Indigenous housing projects. Early Bird registration of just $99+HST is available until the end of December. In the new year, registration for the conference will be $149 +HST. Delegates can find the Ottawa Wood Solutions Conference on Eventbrite or jump directly to online registration with this link: https://www.eventbrite.ca/e/2025-ottawa-wood-solutions-conference-tickets-1080654991169 A limited number of discounted passes are available for post-secondary educators and students in AEC+D programs of study. Please contact Kelsey Dayler for more information kdayler@cwc.ca.
Wood Design & Building Magazine, vol 23, issue 94
Acoustics
Wood is composed of many small cellular tubes that are predominantly filled with air. The natural composition of the material allows for wood to act as an effective acoustical insulator and provides it with the ability to dampen vibrations. These sound-dampening characteristics allow for wood construction elements to be specified where sound insulation or amplification is required, such as libraries and auditoriums. Another important acoustical property of wood is its ability to limit impact noise transmission, an issue commonly associated with harder, more dense materials and construction systems. The use of topping or a built-up floating floor system overlaid on light wood frame or mass timber structural elements is a common approach to address acoustic separation between floors of a building. Depending on the type of materials in the built-up floor system, the topping can be applied directly to the wood structural members or over top of a moisture barrier or resilient layer. The use of gypsum board, absorptive (batt/loose-fill) insulation and resilient channels are also critical components of a wood-frame wall or floor assembly that also contribute to the acoustical performance of the overall assembly. Acoustic design considers a number of factors, including building location and orientation, as well as the insulation or separation of noise-producing functions and building elements. Sound Transmission Class (STC), Apparent Sound Transmission Class (ASTC) and Impact Insulation Class (IIC) ratings are used to establish the level of acoustic performance of building products and systems. The different ratings can be determined on the basis of standardized laboratory testing or, in the case of ASTC ratings, calculated using methodologies described in the NBC. Currently, the National Building Code of Canada (NBC) only regulates the acoustical design of interior wall and floor assemblies that separate dwelling units (e.g. apartments, houses, hotel rooms) from other units or other spaces in a building. The STC rating requirements for interior wall and floor assemblies are intended to limit the transmission of airborne noise between spaces. The NBC does not mandate any requirements for the control of impact noise transmission through floor assemblies. Footsteps and other impacts can cause severe annoyance in multifamily residences. Builders concerned about quality and reducing occupant complaints will ensure that floors are designed to minimize impact transmission. Beyond conforming to the minimum requirements of the NBC in residential occupancies, designers can also establish acoustic ratings for design of non-residential projects and specify materials and systems to ensure the building performs at that level. In addition to limiting transmission of airborne noise through internal structural walls and floors, flanking transmission of sound through perimeter joints and sound transmission through non-structural partition walls should also be considered during the acoustical design. Further information and requirements related to STC, ASTC and IIC ratings are provided in Appendix A of the NBC in sections A-9.10.3.1. and A-9.11.. This includes, inter alia, Tables 9.10.3.1-A and 9.10.3.1.-B that provide generic data on the STC ratings of different types of wood stud walls and STC and IIC ratings for different types of wood floor assemblies, respectively. Tables A-9.11.1.4.-A to A-9.11.1.4.-D present generic options for the design and construction of junctions between separating and flanking assemblies. Constructing according to these options is likely to meet or exceed an ASTC rating of 47 that is mandated by the NBC. Table A-Table 9.11.1.4. presents data about generic floor treatments that can be used to improve the flanking sound insulation performance of lightweight framed floors, i.e., additional layers of material over the subfloor (e.g. concrete topping, OSB or plywood) and finished flooring or coverings (e.g., carpet, engineered wood).
2024 Catherine Lalonde Memorial Scholarships Celebrate Students Driving Innovation in the Wood Industry
Ottawa, ON, December 12, 2024 – The Canadian Wood Council (CWC) announced the recipients of the 2024 Catherine Lalonde Memorial Scholarships: Laura Walters (McMaster University) and Jiawen Shen (University of British Columbia). Both students were recognized for their academic excellence and impactful research projects in the structural wood products industry. Established nineteen years ago, the memorial scholarships are awarded each year to graduate students whose wood research exemplifies the same level of passion for wood and the wood products industry that Catherine Lalonde tirelessly demonstrated as a professional engineer and president of the CWC. Laura Walters Laura is a 3rd-year graduate student pursuing a Master of Applied Science in Civil Engineering under a joint collaboration between McMaster University and the University of Northern British Columbia (UNBC). Her research project explores the use of pre-engineered beam hangers in mass timber post-and-beam systems, with a focus on the implications of design and modelling assumptions on the evaluation of structural load paths. Her work provides valuable insights into the design considerations and assumptions required for more accurate and reliable design of mass timber columns when pre-engineered beam hangers are used. Jiawen Shen Jiawen is a 1st year graduate student pursuing a Master in Wood Science at the University of British Columbia. Her research project focuses on the development of binderless composite bark-board cladding and insulation panels that are durable, ignition resistant, carbon neutral, and manufactured from an underutilized by-product that would otherwise be burned, landfilled, or used for low-value purposes. Collaborating with a Vancouver-based architecture firm on this project, her work is key to advancing the commercial application of these innovative cladding products. “This year marks a historic milestone for the Catherine Lalonde Memorial Scholarship program as, for the first time, it is awarded to two exceptional women,” said Martin Richard, VP of Market Development and Communications at the CWC. “Their achievements highlight the outstanding talent driving innovation in wood research and construction. We are inspired by their contributions and the growing diversity shaping the future of wood-based solutions.”
Vandusen Gardens
BUILDEX and Canadian Wood Council Bring Cutting Edge Wood-Based Design and Construction to All Professionals of the Built Environment
Vancouver, BC, September 19, 2024 – Informa Connect and the Canadian Wood Council announce their collaboration, WoodWorks at BUILDEX, integrating WoodWorks’ technical expertise and wood products industry representation into BUILDEX Vancouver, February 26 – 27, 2025. This initiative builds on a shared commitment to advancing Canada’s built environment and expands BUILDEX’s focus on innovative materials, design, and construction practices. WoodWorks at BUILDEX offers an exceptional opportunity for all professionals of the built environment to immerse themselves in the latest innovations in wood-based design and construction through: Rick Jeffery, President and CEO, Canadian Wood Council, emphasized the importance of this collaboration: “Working with Informa Connect to bring WoodWorks to BUILDEX Vancouver in 2025 allows us to concentrate on one of our core strengths—delivering industry-leading educational content, technical support, and access to leading wood product providers—at Canada’s most progressive design, construction and real estate event.” Sherida Sessa, SVP for North America at Informa Connect, added “British Columbia is recognized as a global leader in wood-based design and construction, and this partnership solidifies BUILDEX as a key destination for technical expertise, innovation and leadership in the wood products industry.” WoodWorks at BUILDEX amplifies BUILDEX Vancouver’s core offering to Canadian and North America’s design and construction leaders: timely market insights, respected technical knowledge, transformative networking, and exposure to the materials and technologies at the forefront of Canada’s built environment. BUILDEX Vancouver will take place February 26 – 27, 2025, at the Vancouver Convention Centre West, attracting over 8,500 developers, architects, engineers, builders, designers, suppliers, and real estate professionals. Register now at www.BUILDEXVancouver.com to secure your place and witness the latest in progressive design and construction trends.
Canadian Wood Council and George Brown College’s Brookfield Sustainability Institute to co-host WoodWorks Summit in Toronto
Ottawa, Toronto | 27 March 2024] – The Canadian Wood Council (CWC) and George Brown College’s Brookfield Sustainability Institute (BSI) are thrilled to announce a strategic partnership aimed at fostering education in sustainable construction practices. Under this partnership, the CWC and BSI will join forces on various initiatives dedicated to accelerating the adoption of sustainable wood construction. Central to this effort is the WoodWorks Summit, which the organizations will co-host in Toronto October 21-25, 2024. The Summit promises to be a dynamic collection of events that will bring together industry leaders, practitioners, academics, and policymakers to explore the latest advancements, challenges, and opportunities in wood construction and sustainability. “We are excited to embark on this collaborative journey with the Brookfield Sustainability Institute,” said Martin Richard, VP of Market Development and Communications at the Canadian Wood Council. “Together, we aim to drive innovation, share knowledge, and accelerate the adoption of sustainable wood construction.” The WoodWorks Summit will feature an engaging lineup of events, including keynote speeches, panel discussions, tours, and networking sessions. Attendees can expect to engage with cutting-edge research, best practices, and real-world case studies, all aimed at demonstrating the use of wood as an innovative, high-performance, sustainable building material. “Our partnership with the Canadian Wood Council underscores our commitment to advancing sustainability in the built environment,” remarked Jacob Kessler, Director of Business Development & Account Management at the Brookfield Sustainability Institute. “By combining our expertise and resources, we can make significant strides to empower the design and construction community with the practical knowledge and technical resources needed to create healthier, more resilient communities with a reduced carbon footprint.” Through this collaboration, the CWC and BSI aim to catalyze positive change within the construction industry. For more information about the WoodWorks Summit, please visit www.woodworkssummit.ca.
Large-Scale Fire Tests of A Mass Timber Building Structure
The Mass Timber Demonstration Fire Test Program (MTDFTP) included two series of experiments: the pilot scale demonstration tests in summer 2021 in Richmond, BC [1] and the large scale fire tests in summer 2022 in Ottawa, ON. The series of large scale fire tests on a mass timber structure were conducted to study fire safety during construction, fire dynamics and performance in an open plan office space and residential suites, and influence of exposed mass timber on fire severity and duration. As part of its research to inform the advancement of safe and innovative solutions across Canada’s construction industry, the National Research Council of Canada (NRC) conducted the technical work and science-based large scale fire tests to support the MTDFTP. NRC was responsible for instrumenting the test structure, setting up fire scenarios and fuel loads, conducting the large scale fire tests, analyzing test data and documenting the results. This report documents the fire scenarios, fuel loads, experimental setups, instrumentation, measurements and procedure used in the large scale fire tests. The experimental data, results of data analysis, key findings and conclusions are provided in the report.
Four-Storey Wood School Design in British Columbia: Life Cycle Analysis Comparisons
Climate change is one of the largest threats facing the planet today. The construction industry accounts for 11% of global carbon emissions, playing a significant part in the climate crisis. To determine the best solution for future school buildings, not only does practicability, economy and constructability play a part, so does sustainability. In order to better understand the embodied carbon emissions associated with the construction of new school buildings in British Columbia, the embodied carbon content associated with the four framing systems examples in the companion report, An Analysis of Structural System Cost Comparisons (costing study), was assessed. The purpose of this study is to allow the embodied carbon associated with these systems to become an important factor when choosing a viable scheme. Embodied carbon is the carbon footprint of a material or product. To determine the embodied carbon of a building you must consider the quantity of greenhouse gases associated with the building. The most effective way to measure this is through Life Cycle Analysis (LCA), a study which determines the embodied carbon from cradle to grave (material extraction to building demolition). Consequently, an LCA was conducted for each of the four schemes presented in the costing study. Additionally, for wood frame Options A and B, WoodWorks online carbon calculator was used to determine the potential carbon savings associated with carbon sequestering.
