Built-Up Roofs Aggregate Surfacing

(1)  Aggregate used for surfacing built-up roofs shall be clean, dry and durable and shall consist of particles of gravel, crushed stone or air-cooled blast furnace slag having a size of from 6 mm to 15 mm.


(2)  The minimum amount of aggregate surfacing per square metre of roof surface shall be 15 kg gravel or crushed stone or 10 kg crushed slag.

Article Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.