The Ontario Building Code | Sound Transmission Class
18.104.22.168. Sound Transmission Class
(1) Sound transmission class ratings shall be determined in accordance with ASTM E413, "Classification for Rating Sound insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation", using the results from measurements in accordance with,
(a) ASTM E90, "Laboratory Measurement of Airborne Sound Transmission Loss of building Partitions and Elements", or
(b) ASTM E336, "Measurement of Airborne Sound Attenuation Between Rooms in Buildings".