Montreal’s clay soils and freeze-thaw cycles put real stress on foundations. Acting early avoids far costlier repairs.
Spot the warning signs
- Horizontal or stair-step cracks in basement walls.
- Water marks, dampness, or whitish efflorescence.
- Sloping floors or doors that stick.
- A persistent musty smell.
Require the RBQ licence
As with roofing, the contractor must hold a Régie du bâtiment du Québec (RBQ) licence and current insurance. Ask for recent references.
Waterproofing: interior or exterior
Exterior waterproofing (excavation) treats the cause; interior solutions (drains, membranes) manage water that gets in. A good contractor explains the trade-offs.
See all renovation contractors in Montreal →Frequently asked questions
Is a crack always serious?
Thin vertical cracks are often harmless. Horizontal or widening cracks deserve a prompt inspection.
Does home insurance cover the work?
It depends on the cause. Document everything and check your policy; some backups and water damage are covered, but wear and tear is not.