A Zero Carbon Hybrid Wood Supertall Future
Course Overview With buildings generating 40% of global carbon emissions, we need to achieve net-zero by 2050 to meet the Paris Agreement target and limit global warming to 2°C. Timber sequesters an average of 1.9 metric tons of carbon-dioxide equivalent emissions per cubic meter (Sathre & O’Connor, 2010). While a purely mass timber tall building may not be the most cost-efficient solution, a hybrid structure can maximize the overall use of wood by volume in the most cost-efficient manner. Floor systems in buildings contribute as much as 73% of the environmental impact of a high-rise building’s structure (Lankhorst et al., 2019), making them an excellent target for reducing embodied carbon. DIALOG’s patent- pending Hybrid Timber Floor System (HTFS) takes advantage of the benefits of cross-laminated timber (CLT) combined with pre-stressed concrete to achieve a 12-metre column-free span. The HTFS is proposed as part of our Hybrid Timber Tower, a 105-storey mixed-use prototype that is being evaluated and tested by DIALOG and EllisDon. The prototype structure consists of the hybrid timber floor, combined with a concrete core and an external steel frame. Fire safety is achieved in the floor panels as the exposed wood chars to form a protective layer, while the non-combustible concrete and steel band continues to support the panel. The exposed CLT panels also provide a biophilic appeal, which has shown to support cognitive function as well as physical and psychological well-being (Vidovich, 2020). DIALOG, EllisDon, FPInnovations and other partners have completed the first phase of small-scale testing on over 40 panels. We are scheduled for fire testing of the panels in Ottawa with NRCan this fall with full scale testing of the 12-meter panels starting in late 2022. Learning Objectives Describe how hybrid mass timber systems—such as the Hybrid Timber Floor System (HTFS)—reduce embodied carbon and support zero‑carbon goals in high-rise, mixed-use developments. Explain the structural, fire safety, and performance characteristics of hybrid CLT–concrete floor assemblies, including how charring, concrete bands, and steel elements contribute to long-span capability and code compliance. Evaluate the role of multidisciplinary research, prototyping, and large-scale testing in validating hybrid timber technologies for supertall applications, including their impacts on sustainability, biophilia, and cost efficiency. Course Video Speaker Bio Craig Applegath, BSc, BArch, MArchUD, PPOAA, AIBC, NSAA, AIA, FRAIC, LEED® APBD+C Founding Partner & Architect DIALOG Craig Applegath is the founding principal of DIALOG’s Toronto Studio, and a passionate designer who believes in the power of built form to meaningfully improve the wellbeing of communities and the environment they are part of. Since graduating from the Graduate School of Design at Harvard University with a Master of Architecture in Urban Design Craig has focused his energies on leading innovative planning and design projects that address the complex challenges facing our communities, as well as on his advocacy of sustainable building design and urban regeneration and symbiosis. Craig’s area of practice includes the master planning and design of institutional projects, including post secondary education, healthcare facilities, as well as the design of innovative mixed-use- facilities. Craig was a founding Board Member of Sustainable Buildings Canada, a Past President of the Ontario Association of Architects, and the current moderator of SymbioticCities.net. Craig has lectured or taught at Harvard, the University of Toronto, the University of Waterloo, as well as at many professional and sector related conferences around the world. In 2001 Craig was made a Fellow of the Royal Architectural Institute of Canada for his contributions to the profession of architecture. In 2017 he was presented with the OALA Honourary Membership Award for his contributions to the cause of landscape architecture in Ontario. Neel Bavishi, PEng, CEM Building Performance Analysis, Associate DIALOG Neel is passionate about applying the art and science of building performance simulation and data-driven design to produce positive outcomes for the built environment. He embraces holistic solutions that minimize the environmental impact of building assets while providing enhanced value to building owners, developers, policymakers, and designers through improved well-being and reduced total cost of ownership. Neel believes that an integrated and collaborative approach that incorporates diverse perspectives is essential for delivering high-performance buildings. A mechanical engineer by training, Neel is well-versed in whole-building energy modelling for both new and existing buildings and lifecycle cost analysis, design optimization, and data visualization. His experience includes developing energy models for green building certification programs, carbon-neutral retrofit studies and district energy strategies, and the development of net-zero energy and emissions policies and standards for municipal, provincial, and federal government bodies. His projects span various asset classes, including recreational facilities, commercial high-rise towers, multi-unit residential buildings, hospitals, data centres, and transit facilities. He is a licensed Professional Engineer in the province of Ontario and is a Certified Energy Manager. Cameron Ritchie, PEng, PE, PhD, BSE Structural Engineer, Associate DIALOG Cameron is an Associate on the Structural Engineering team in DIALOG’s Toronto studio. Since graduating with a PhD from the University of Toronto, Cameron has acted as a structural design engineer and project manager across a variety of sectors and project types, including healthcare, institutional, government, and retail. He has experience in all stages of a project delivery, from feasibility studies through construction administration and management. Cameron is DIALOG’s project manager for the hybrid timber floor system (HTFS) research program, working closely with industry partners EllisDon. He is passionate about exploring mass timber wherever possible as a sustainable solution to our building needs.
A Business Case for Tall Wood
Course Overview This session will present a vision and business case for innovation, sustainability, and affordability for the tallest residential wood tower in the world (proposed in Nova Scotia). Addressing rapid delivery to meet urgent residential needs supported by Bird Construction costing and scheduling. Learning Objectives Understand the business case for developing tall residential mass timber buildings, including how sustainability, affordability, and rapid delivery needs are addressed through advanced structural design and innovative project phasing strategies. Identify the key costing, scheduling, and manufacturing considerations that influence the feasibility of tall wood construction, including lessons learned from previous mass timber projects and the role of integrated project teams in mitigating bottlenecks. Evaluate how mass timber products such as glulam and CLT can support high‑rise residential development, including insights into supply‑chain innovation, local manufacturing capacity, and the broader economic and environmental impacts of tall wood construction in Atlantic Canada. Course Video Speaker Bio Patrick Crabbe Director of Mass Timber Bird Construction Patrick Crabbe is the Director of Mass Timber at Bird Construction – Bird is a publicly traded, commercial and industrial conglomerate, recognized as a top 5 General Contractor (GC) in Canada. Patrick is also the leader of a Mass Timber Manufacturing start-up, based in Halifax, Nova Scotia. MTC is a sawmill integrated, glulam focused entity, that is currently executing a $2.3M feasibility effort to code approve proprietary high performing mass timber products (made from undervalued-commodity maritime spruce, pine and fir) that will expand the needed capacity of North American mass timber products and positively impact sustainable forestry practises. Patrick’s professional career has been dedicated to developing markets for high-value structural wood products and working with industry to facilitate the. Through this experience, Patrick has a comprehensive understanding of construction contract methods supply chain solutions to set-up large, complex, mass timber build programs for success. Patrick is an active member of the Carbon Pricing Leadership Coalition (led by the World Bank) and a trusted advisor to Infrastructure British Columbia and the Canadian Wood Council. Joe Nickerson Vice President & Partner Sidewalk Real Estate Development Joe Nickerson is a leader with a proven history of success managing a variety of real estate portfolios for high-net-worth families in Toronto, Alberta, and British Columbia. Joe has worked at RBC Capital Markets and for both private and public real estate holding companies ranging from $100M to $11B in AUM. Joe holds an MBA with a specialization in Real Estate & Infrastructure from Schulich School of Business and studied Private Equity & Finance at SDA Bocconi University in Milan, Italy.
