Sealant joints, backer rod and movement

Design the joint to accommodate movement instead of simply filling a crack with more sealant.

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

Very narrow/deep joint
Check joint geometry, width and depth before resealing. Three-sided adhesion
Provide suitable backer/bond breaker before resealing. Sealant repeatedly cracks
Diagnose movement, substrate and product instead of adding layers. Clean stable joint
Record product, date and substrate preparation.

What the professional checks

Size joint geometry and movement
Select compatible sealant/backing

Official sources

CNRC — mouvement des joints et sélection des scellants

Checked: 2026-08-22

V16

Advanced diagnostics to cross-check

V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.

Material compatibility