Type of Granular Material

    (1)  Granular material used to drain the bottom of a foundation shall consist of a continuous layer of crushed stone or other coarse clean granular material containing,

    (a)   not more than 10% of material that will pass a 4 mm sieve, and

    (b)   no pyritic material in a concentration that would adversely affect its stability or the performance of assemblies separating dissimilar environments.

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