Houses with a Secondary Suite s. 9.11.1.1

9.11.1.1 Required Protection

Current to 2026-08-01 · Official PDF

2) Where a house contains a secondary suite, each dwelling unit shall be separated from every other space in
the house in which noise may be transmitted by
a) construction
i) whose joist spaces are filled with sound-absorbing material of not less than 150 mm nominal thickness,
ii) whose stud spaces are filled with sound-absorbing material,
iii) having a resilient channel on one side of the separation spaced 400 or 600 mm o.c., and
iv) having not less than 12.7 mm thick gypsum board on ceilings and on both sides of walls,
b) construction providing an STC rating of not less than 43, or
c) a separating assembly and adjoining constructions, which together provide an ASTC rating of not less than
40.
(See Note A-9.11.1.1.(2).)