SS · Houses with a Secondary Suite
9.10.9.3 Openings to be Protected with Closures
a) be solid-core, wood doors at least 45 mm thick, and
b) have a self-closing device.
(See Note A-9.10.9.3.(2).)
Note A-9.10.9.3.(2) Openings in Smoke-Tight Barriers to be Protected with Closures. Doors
described in Sentence 9.10.9.3.(2) are deemed to provide a minimum 20 min fire-protection rating, which is
considered an acceptable level of protection against the spread of fire in a house with a secondary suite. They
are not required to be marked to identify conformance to CAN/ULC-S113, "Standard Specification for Wood
Core Doors Meeting the Performance Required by CAN/ULC-S104 for Twenty Minute Fire Rated Closure
Assemblies," as is the case for solid-core doors installed in fire separations.