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A sloped surface is required to effectively drain water away from the 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 m. Minimum 20 cm drop for soft surface / landscaping (clay, topsoil or sod)
  • Minimum 15 cm drop for a side lot less than 1.5 m for soft surface / landscaping (clay, topsoil or sod)
  • 0.75% for hard surface or other impervious surface treatment (concrete or asphalt)

Or, for a side lot less than 1.5 meters, provide a 15 cm drop away from the foundation wall.

Grading Examples

The following pictures illustrate the proper grades around the foundation wall:

For More Information

Development Services, Lot Grading

2nd Floor, Edmonton Tower
10111 104 Avenue NW
Edmonton, AB

T5J 0J4


311 or 780-496-5576

Fax 780-496-2865

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