MEMBER Wood Products;

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MEMBER Forest Operations; Pulp, Paper and Bioproducts;

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Some innovative and structurally efficient uses of massive wood panels, such as cross-laminated timber (CLT), will result in hollow structural sections. Light-weight wood construction as well as heavy timber assemblies using dropped ceilings or raised floors to allow for the passage of building services, can also create horizontal concealed spaces in floor assemblies. Concealed horizontal spaces provide a potential path for fire to spread quickly throughout a building which could go undetected. The review of the NBCC and related standards, namely NFPA 13, identified several requirements that aim to limit the spread of fire in combustible concealed spaces. This project is divided into 2 phases and is intended to address limitations of wood in regards to flame spread through the evaluation of fire spread in cavities of light-frame floor assemblies as well as in heavy timber assemblies. Phase 1 of this project provides insight into the actual fire risk associated with combustible concealed spaces by reviewing the National Building Code of Canada and NFPA 13 requirements with respect to fire protection of combustible concealed spaces, fire blocks and sprinkler system requirements as well as reviewing existing test data and regulatory requirements in an attempt to identify the fire safety objectives and functional requirements. Phase 2 of this project will consist in carrying out flame spread tests in accordance with ULC S102 standard on real-scale light-framed and heavy timber assemblies (with and without insulation) with surfaces protected with fire retardant (or intumescent) coatings.


  • Open to all
  • Wood products member
  • Pulp, paper and bioproducts member
  • Forest operations member