The Ontario Building Code | Prevention of Accumulation and Ingress
220.127.116.11. Prevention of Accumulation and Ingress
(1) Except as provided in Sentence (3), the building shall be located, the building site shall be graded or catch basins shall be installed so that surface waterwill not accumulate against the building.
(2) Except as provided in Sentence (3), the foundation walls shall be constructed so that surface water will not,
(a) enter the building, or
(b) damage moisture susceptible materials.
(3) Buildings specifically designed to accommodate accumulation of water at the building or the ingress of water need not comply with Sentence (1) or Clause (2)(a).
Section 5.8. Moisture in the Ground
5.8.1. Foundation and Floor Drainage