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NBC 2020 Firestop Requirements - Interior Finishing

Nicole Zimmerman
Reading time: < 5 minutes
Article

Finition intérieure

NBC 2020 Firestop Requirements - Interior Finishing

NBC 2020 Firestop Requirements - Interior Finishing

Joints Within and Between Fire Rated Walls/Floors

  • Joint firestop systems in all joints (static or dynamic) must now have been tested to fire test method CAN/ULC-S115. Available tested systems are found in UL and Intertek listings.

  • The published FT rating of the joint firestop system must be equal to the required fire rating of the assembly with the joint.

  • The selected joint firestopping system must accommodate potential joint movement (system listing will report maximum joint compression and extension).

Find joint firestop systems certified for Canada here: https://hcp.hilti.com/

Code reference: NBC 2020 3.1.8.3.(2), 3.1.8.3.(3), A-3.1.8.1.(1)(b), A-3.1.8.3.(2)

Joints Within and Between Fire Rated Walls/Floors

Curtain Wall Edge-of-Slab Joints

  • The joint firestop system at the edge-of-slab (curtain wall joint) must now have been tested to fire test method ASTM E2307. Available tested systems are found in UL and Intertek listings.

  • The published F rating of the perimeter joint firestop system must be equal to the required fire rating of the floor assembly.

  • Any Engineering Judgment offered when a matching tested and listed system is unavailable should always detail the specific curtain wall construction, since E2307 fire test performance is heavily dependent on the construction details of the curtain wall.

Find perimeter (curtain wall) joint firestop systems certified for Canada here: https://hcp.hilti.com/

Code reference: NBC 2020 3.1.8.3.(4)

Curtain Wall Edge-of-Slab Joints

Recessed Boxes in Fire Rated Walls

  • All recessed boxes must be provided with a firestop system (e.g. listed putty pads) tested to CAN/ULC-S115, unless ALL of the conditions below apply:

  • Box is noncombustible, and

  • Individual box size is ≤ 0.016 m2 (25 sq in), and

  • Aggregate area of boxes is ≤ 0.065 m2 (100 sq in) in any 9.3 m2 (100 sq ft) of surface area, and

  • Outlet boxes on opposite sides of a rated wall are separated by a minimum of 600mm, or by fireblocking conforming to NBC article 3.1.11.7.

Find recessed box firestop systems certified for Canada here: https://hcp.hilti.com/

Choose “penetration”, then “membrane”, then specific box type (electrical, shower, med gas).

Code reference: NBC 2020 3.1.9.3

Recessed Boxes in Fire Rated Walls
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