National baseline
NBC Part 3 Division B covers fire-rated glazing requirements within the fire separation, opening protection, and exit enclosure provisions. CAN/ULC-S101 and CAN/ULC-S106 are referenced testing standards.
Canadian building code question
What are the building code requirements for fire-rated glazing in Canada?
The NBC permits fire-rated glazing in fire separations, exit enclosures, and other fire-rated assemblies when the glazing assembly is tested and listed for the required fire-resistance or fire-protection rating, with restrictions on area, location, and type based on the specific application.
Fire-rated glazing allows natural light and visibility through fire-rated walls and doors while maintaining fire-resistance or fire-protection performance. The National Building Code sets requirements for the type of fire-rated glass permitted in different applications, the maximum area of glazing, and the testing standards the assembly must meet.
What to check first
- Fire-rated glazing must be tested to CAN/ULC standards and listed for the specific fire-resistance or fire-protection rating required by the application.
- Wired glass, ceramic glass, and intumescent-laminated glass have different permitted applications based on their fire-test performance.
- The maximum area of fire-rated glazing in a fire separation may be limited based on the separation type and fire-resistance rating.
Jurisdiction notes
Provincial variations
Provinces may have additional restrictions or permissions for fire-rated glazing, particularly in exit enclosures and fire separations within specific occupancy types.
Product listings
Fire-rated glazing must be used in accordance with its tested and listed assembly, including the frame, glazing compound, and maximum panel size.
Work through it in this order
- Identify the fire-resistance or fire-protection rating required for the wall, door, or assembly where glazing is proposed.
- Determine whether the application permits fire-rated glazing (some separations may restrict or prohibit glazing).
- Select glazing products tested and listed for the required rating and application (fire-resistance vs. fire-protection).
- Verify the maximum permitted glazing area for the specific fire separation type and rating.
- Confirm the complete assembly (frame, glazing, sealant) matches the tested and listed configuration.
Common questions
Can I put a window in a fire-rated wall?
Yes, if the window assembly (glass, frame, and sealant) is tested and listed for the fire-resistance or fire-protection rating required for that wall, and the glazing area does not exceed code limits.
What is the difference between fire-protection and fire-resistance glazing?
Fire-protection glazing blocks flames and smoke but allows radiant heat transfer. Fire-resistance glazing blocks flames, smoke, and radiant heat, making it suitable for applications where heat transmission must be limited.
Is wired glass still permitted in Canada?
Traditional wired glass has limited permitted applications under current codes due to impact safety concerns. Newer fire-rated glazing products have largely replaced wired glass in many applications.