1. Except as provided in Sentences (2) and (3), a dwelling unit shall be separated from every other space in a building in which noise may be generated by
   1. a separating assembly and adjoining constructions, which together provide an apparent sound transmission class (ASTC) rating of not less than 47, or
   2. a separating assembly providing a sound transmission class (STC) rating of not less than 50 and adjoining constructions that conform to Article 9.11.1.4. (See Note A-9.11.1.4.)
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
   1. construction
      1. whose joist spaces are filled with sound-absorbing material of not less than 150 mm nominal thickness,
      2. whose stud spaces are filled with sound-absorbing material,
      3. having a resilient channel on one side of the separation spaced 400 or 600 mm o.c., and
      4. having not less than 12.7 mm thick gypsum board on ceilings and on both sides of walls,
   2. construction providing an STC rating of not less than 43, or
   3. 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).)
3. Construction separating a dwelling unit from an elevator shaft or refuse chute shall have an STC rating of not less than 55.

1. The STC ratings shall be determined in accordance with ASTM E 413, "Classification for Rating Sound Insulation," using the results from measurements carried out in accordance with ASTM E 90, "Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements."
2. The ASTC ratings shall be
   1. determined in accordance with ASTM E 413, "Classification for Rating Sound Insulation," using the results from measurements carried out in accordance with ASTM E 336, "Measurement of Airborne Sound Attenuation between Rooms in Buildings," or
   2. calculated in accordance with Article 5.8.1.4. or 5.8.1.5.

1. Compliance with the required STC ratings shall be demonstrated through
   1. measurements carried out in accordance with Sentence 9.11.1.2.(1), or
   2. the construction of separating assemblies conforming to Table 9.10.3.1.-A or 9.10.3.1.-B, as applicable.
2. Compliance with the required ASTC ratings shall be demonstrated through
   1. measurements or calculations carried out in accordance with Sentence 9.11.1.2.(2), or
   2. the construction of separating assemblies conforming to Table 9.10.3.1.-A or 9.10.3.1.-B, as applicable, that have an STC rating of not less than 50 in conjunction with flanking assemblies constructed in accordance with Article 9.11.1.4. (see Note A-9.11.1.3.(2)(b)).

1. This Article applies where the required protection is provided in accordance with Clause 9.11.1.1.(1)(b) and compliance is demonstrated in accordance with Clause 9.11.1.3.(2)(b).
2. Flanking wall assemblies connected to a separating floor or ceiling assembly shall be constructed with
   1. concrete or concrete block having a mass per area greater than 200 kg/m², or
   2. gypsum board finish that
      1. is supported on wood or steel framing, and
      2. ends or is interrupted where it meets the structure of the separating floor or ceiling assembly.
3. Flanking wall and ceiling assemblies connected to a separating wall assembly shall be constructed with
   1. concrete or concrete block having a mass per area greater than 300 kg/m², or
   2. gypsum board finish that
      1. is supported on wood or steel framing, and
      2. ends or is interrupted where it meets the structure of the separating wall assembly or, for double-stud walls, where it meets the space between the two lines of studs.
4. Flanking floor assemblies connected to a separating wall assembly shall be
   1. constructed
      1. with concrete having a mass per area greater than 300 kg/m², or
      2. in accordance with Section 9.16., or
   2. supported on joists or trusses that are not continuous across the junction and are covered with floor treatments in accordance with Table 9.11.1.4. for the applicable wall construction.

Table 9.11.1.4.
Floor Treatments for Flanking Wood-Framed Floor Assemblies in Horizontally Adjoining Spaces
Forming Part of Sentence 9.11.1.4.(4)

Notes to Table 9.11.1.4.:
(1) See Note A-Table 9.11.1.4.