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