PART 5 — ENVIRONMENTAL SEPARATIONUpdated for the 2024 Ontario Building Code
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5.8.1.2.Determination of Sound Transmission Ratings (See Note A-5.8.1.2.)
(1) The STC ratings of separating assemblies shall be determined in accordance with ASTM E413, “Classification for
Rating Sound Insulation,” using the results from measurements carried out in accordance with ASTM E90, “Standard
Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements.”
(2) The ASTC ratings of separating assemblies and adjoining constructions shall be
(a) determined in accordance with ASTM E413, “Classification for Rating Sound Insulation,” using the results from
measurements carried out in accordance with ASTM E336, “Standard Test Method for Measurement of Airborne
Sound Attenuation between Rooms in Buildings,” or
(b) calculated in accordance with
(i) the detailed method described in Article 5.8.1.4., or
(ii) the simplified method described in Article 5.8.1.5.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.