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