(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.