Minimum Grade

A sloped surface is required to effectively drain water away from all foundation walls including areas under steps and decks. This will greatly reduce the risk of surface water entering the basement during rainfalls or snowmelt.

Minimum Grade Requirements
  • 10% for first 2.0 m – Minimum 20 cm drop for final landscaping.
  • 15 cm drop on side lots that are less than 2.0 m.
  • 0.75% for concrete, asphalt or other impervious surface treatment, to within 15 cm of the property line. Example: a concrete sidewalk along the side of the house and/or garage. And/or 0.75% for 2.0 m from a foundation wall at any other location.
Grading Examples


Backfill is required, in this case, to fill in the area under these steps.


Improper grading, as is evident around this window well, may result in flooding.


This window well is properly graded with good backfill all around.

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