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Ontario Building Code

A-9.11.1.4. Adjoining Construction.

© King's PrinterJan 16, 2025

Tables A-9.11.1.4.-A to A-9.11.1.4.-D present generic options for the design and construction of junctions between separating and flanking assemblies. Constructing according to these options is likely to meet or exceed an ASTC rating of 47. Other designs may be equally acceptable if their sound resistance can be demonstrated to meet the minimum ASTC rating or better on the basis of tests referred to in Article 9.11.1.2., or if they comply with Subsection 5.8.1. However, some caution should be applied when designing solutions that go beyond the options provided in these Tables: for example, adding more material to a wall could negatively impact its sound performance or have no effect at all.

Table A-9.11.1.4.-A presents compliance options for the construction of separating wall assemblies with flanking floor, ceiling and wall assemblies in horizontally adjoining spaces.

Table A-9.11.1.4.-B presents options for improving the sound performance of separating wall systems beyond that achieved by implementing the options presented in Table A-9.11.1.4.-A. The suggested performance improvement options are listed in order of approximate acoustic priority and are interdependent, i.e., if options at the top of the list are not implemented, then options at the bottom of the list will have much lesser effect.

Table A-9.11.1.4.-C presents compliance options for the construction of separating floor/ceiling assemblies with flanking wall assemblies in vertically adjoining spaces.

Table A-9.11.1.4.-D presents options for improving the sound performance of separating floor/ceiling assemblies beyond that achieved by implementing the options presented in Table A-9.11.1.4.-C. The suggested performance improvement options are listed in order of approximate acoustic priority and are interdependent, i.e., if options at the top of the list are not implemented, then options at the bottom of the list will have much lesser effect.

Options for the Design and Construction of Junctions and Flanking Surfaces Between Separating Wall Assemblies in Horizontally Adjoining Spaces for Compliance with Clause 9.11.1.1.(1)(b)

Notes to Table A-9.11.1.4.-A:

(1) See also Table A-9.11.1.4.-B.

(2) Sound absorptive material is porous (closed-cell foam was not tested) and includes fibre processed from rock, slag, glass or cellulose fibre with a maximum density of 32 kg/m3. See Notes (5) and (8) of Table 1 and Note (5) of Table 2 of MMAH Supplementary Standard SB- 3, “Fire and Sound Resistance Tables” for additional information.

(3) Resilient metal channels are formed from steel having a maximum thickness of 0.46 mm (25 gauge) with slits or holes in the single “leg” between the faces fastened to the framing and to the gypsum board (see Figure 4 in MMAH Supplementary Standard SB-3).

ASTM C754, “Standard Specification for Installation of Steel Framing Members to Receive Screw-Attached Gypsum Panel Products”, describes the installation of resilient metal channels.

(4) Normal-weight concrete block units conforming to CSA A165.1, “Concrete block masonry units”, have aggregate with a density not less than 2 000 kg/m3 ; 190 mm hollow core units are 53% solid, providing a wall mass per area over 200 kg/m2 ; 140 mm hollow core units are 75% solid, providing a wall mass per area over 200 kg/m2.

Options for the Construction of a Separating Wall System to Further Improve the Sound Insulation Performance Achieved with the Options in Table A-9.11.1.4.-A

Notes to Table A-9.11.1.4.-B:

(1) Resilient metal channels are formed from steel having a maximum thickness of 0.46 mm (25 gauge) with slits or holes in the single “leg” between the faces fastened to the framing and to the gypsum board (see Figure 4 in MMAH Supplementary Standard SB-3, “Fire and Sound Resistance Tables” for additional information.) ASTM C754, “Standard Specification for Installation of Steel Framing Members to Receive Screw-Attached Gypsum Panel Products”, describes the installation of resilient metal channels.

(2) Sound absorptive material is porous (closed-cell foam was not tested) and includes fibre processed from rock, slag, glass or cellulose fibre with a maximum density of 32 kg/m3. See Notes (5) and (8) of Table 1 and Note (5) of Table 2 of MMAH Supplementary Standard SB-3, “Fire and Sound Resistance Tables” for additional information.

Options for the Design and Construction of Junctions and Flanking Surfaces Between Separating Floor/Ceiling Assemblies in Vertically Adjoining Spaces for Compliance with Clause 9.11.1.1.(1)(b)

Notes to Table A-9.11.1.4.-C:

(1) See also Table A-9.11.1.4.-D.

(2) Sound absorptive material is porous (closed-cell foam was not tested) and includes fibre processed from rock, slag, glass or cellulose fibre with a maximum density of 32 kg/m3. See Notes (5) and (8) of Table 1 and Note (5) of Table 2 of MMAH Supplementary Standard SB-3, “Fire and Sound Resistance Tables” for additional information.

(3) Resilient metal channels are formed from steel having a maximum thickness of 0.46 mm (25 gauge) with slits or holes in the single “leg” between the faces fastened to the framing and to the gypsum board (see Figure 4 in MMAH Supplementary Standard SB-3).

ASTM C754, “Standard Specification for Installation of Steel Framing Members to Receive Screw-Attached Gypsum Panel Products”, describes the installation of resilient metal channels.

(4) Normal-weight concrete block units conforming to CSA A165.1, “Concrete block masonry units”, have aggregate with a density not less than 2 000 kg/m3 ;190 mm hollow core units are 53% solid, providing a wall mass per area over 200 kg/m2 ; 140 mm hollow core units are 75% solid, providing a wall mass per area over 200 kg/m2.

Options for the Construction of a Separating Floor System to Further Improve the Sound Insulation Performance Achieved with the Options in Table A-9.11.1.4.-C

Notes to Table A-9.11.1.4.-D:

(1) Sound absorptive material is porous (closed-cell foam was not tested) and includes fibre processed from rock, slag, glass or cellulose fibre with a maximum density of 32 kg/m3. See Notes (5) and (8) of Table 1 and Note (5) of Table 2 of MMAH Supplementary Standard SB-3, “Fire and Sound Resistance Tables” for additional information.

(2) Resilient metal channels are formed from steel having a maximum thickness of 0.46 mm (25 gauge) with slits or holes in the single “leg” between the faces fastened to the framing and to the gypsum board (see Figure 4 in MMAH Supplementary Standard SB-3).

ASTM C754, “Standard Specification for Installation of Steel Framing Members to Receive Screw-Attached Gypsum Panel Products”, describes the installation of resilient metal channels.

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