Did you know that the world’s tallest wood building is the new student residence at the University of British Columbia? Tall wood buildings are also in Quebec and coming to Ontario. As various building trades and organizations expand their scope of work, new products and construction techniques will be emerging in Ontario and throughout the world. Through organizations such as the Canadian Wood Council, the Ministry of Natural Resources and Forestry, Ontario Fire Fighters and many more we are working to make tall wood and mass timber buildings a building alternative in Ontario. Ontario’s fire fighters are participating to ensure that tall wood and heavy wood buildings will meet all fire code requirements and include fire safety and suppression systems. It is important to note that these buildings are constructed of heavy wood components and not lightweight wood that is found in single family homes and buildings up to 6 storeys. The structural components in the tall wood buildings are heavy mass engineered wood products that are encapsulated or otherwise protected to meet the fire resistance ratings required by buildings built of other components such as steel and reinforced concrete. A concern to Ontario Fire Fighters is during the construction phase of these buildings. Ontario towns and cities have experienced large fires in unfinished midrise and low-rise buildings constructed of lightweight wood components. During construction most or all of the wood structure is exposed and burns rapidly. The nature of heavy timber means fire during construction will grow slower than fires in light-weight wood buildings however we have no recent experience with these specific situations. Ontario fire fighters in many municipalities provide inspection services during planning and construction phases of new construction. Ensuring building owners maintain clean and safe building sites will be imperative. Post construction, fire suppression crews ensure building familiarity and knowledge of the fire alarm and protection services of the building.