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Is a floor drain required in a basement in Quebec?

According to the Quebec Construction Code, a floor drain in a basement is not systematically mandatory in a residence, but it is strongly recommended:

Requirements:

  • Buildings with a water heater or boiler in the basement: a floor drain is strongly recommended, and may be required by insurers
  • Buildings with a sprinkler system: floor drain required
  • Commercial/industrial spaces: often mandatory depending on use
  • Finished basement with bathroom or laundry room: floor drain required in the laundry area

Floor drain characteristics:

  • Diameter: 4 in (102 mm) for standard floor drains
  • Trap: Must have an accessible P-trap. The trap can dry out over time — plan a water supply tap nearby
  • Grate: Steel or cast iron, must be flush with the finished concrete surface

Alternative: A floor drain with built-in check valve prevents sewer backups during heavy rain. Cost: $75 to $150 for the drain itself.

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