Standard fire endurance tests were performed on a full-scale floor assembly and a full-scale wall assembly constructed with cross-laminated timber (CLT) as the main structural element. The full-scale floor assembly consisted of CLT panels encapsulated with fiberglass wool and a single layer of 15.9 mm thick Type X gypsum board on the exposed side and with two layers of 12.7 mm thick cement board on the unexposed side. The full-scale wall assembly was constructed from CLT panels encapsulated with two layers of 15.9 mm thick Type X gypsum board on both faces. Nine thermocouples were installed on the unexposed face of both assemblies to monitor the temperature rise throughout the test and nine deflection gauges were installed on each assembly to monitor deformations. The superimposed load applied on the floor assembly was 9.4 kN/m² and the load imposed on the wall assembly was 449 kN/m. The fire endurance period of the full-scale floor assembly was 128 minutes and that of the full-scale wall assembly 219 minutes. Both the full-scale floor assembly and the full-scale wall assembly failed structurally afterwards under the applied loading. No hose stream tests were carried out on the fullscale floor and wall assemblies.
Working in collaboration with the Canadian Wood Council and FPInnovations and in partnership
with Natural Resources Canada and the governments of Ontario, Quebec and British Columbia,
the National Research Council conducted a comprehensive research project, Research
Consortium for Wood and Wood-Hybrid Mid-rise Buildings. This consortium project aimed to
develop technical information that could be used to support acceptable solutions that meet the
NBC’s objectives for fire safety, acoustics, and building envelope performance, in order to
facilitate the use of wood-based structural materials in mid-rise buildings.
The objectives of the Wood and Wood-Hybrid Midrise Buildings research project were to
develop performance data and technical solutions in the areas of fire safety, acoustics and
building envelope pertinent to the use of wood-based structural materials in mid-rise buildings,
i.e. to develop an alternative solution to meet the 2010 NBC requirements for non-combustible
construction for 5-6 storey (and taller) buildings.
This project was intended to address the immediate needs for technical
solutions for mid-rise wood buildings that do not compromise the minimum levels of safety and
performance required by the 2010 NBC in the areas of fire safety and fire protection, acoustics,
and building envelope performance.
This report describes a full-scale exterior wall fire test conducted on December 16, 2014 on a Nordic cross-laminated timber (CLT) wall system. The test was conducted in accordance with CAN/ULC-S134-13, Standard Method of Fire Test of Exterior Wall Assemblies. The test was conducted using the exterior wall fire test facility located in the Burn Hall of the NRC Fire Laboratory, Mississippi Mills, Ontario. The CLT wall system was assembled to represent a continuous solid wood wall covered by a water barrier membrane and insulation. The pilot burners were lit prior to the commencement of the test. Gas flow to the burners was manually adjusted to follow the prescribed heat input required by the standard.
A full-scale demonstration fire was conducted at National Research Council Canada (NRCC) to show that a 2-hr non-standard severe design fire in an apartment would have little or no effect on an adjacent elevator or stair shaft. The test was performed to support the approval of an alternative solution for a deemed-to-satisfy 2-hr...
A full-scale demonstration dire was conducted at National Research Council Canada to show how a mass timber vertical shaft could withstand a severe fire exposure lasting at least two hours. The fire resistance tests and the demonstration fire were performed to support the approval and construction of a tall wood building in Quebec city; the building is planned to be 13 storeys which includes a 12-storey wood structure above a 1-storey concrete podium. An updated calculation methologody to determine the fire resistance of CLT is provided in Capter 8 (Fire) of the CLT Handbook.