Floor drain trap seals and primers

Keep rarely used floor drains from losing trap seals and admitting odours/gases, distinct from whole-system vent diagnosis.

VERT / GREEN = documenter/entretenir · JAUNE / YELLOW = vérifier avant travaux · ROUGE / RED = arrêter le DIY et faire valider.

Dry drain/recurring odour
Check trap seal, use frequency and permitted maintenance method. Required primer absent/failed
Verify appropriate device before concealing the drain. Drain buried under new floor
Do not bury a required drain/access without validation. Trap seal maintained
Add to seasonal maintenance.

What the professional checks

Verify drain type and trap-seal maintenance
Coordinate primer/access with local code

Official sources

CNRC — garde d’eau des drains de plancher

Checked: 2026-08-22

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