Waterproofing Basement Walls From Outside: The Permanent Fix

Exterior basement waterproofing is more expensive and more disruptive than interior. It's also the only fix that stops water before it touches your foundation.

Why exterior wins for chronic problems

Interior systems collect water that has already entered. Exterior systems prevent entry entirely. For long-term durability and home resale value, exterior is the gold standard.

What's involved

Excavation to the footing. Wall cleaning and crack repair. Heavy-duty rubberized membrane. Dimple board. New weeping tile. Backfill and re-grading. Lawn restoration.

How long it lasts

Done properly with modern materials, 30+ years easily. We back ours with a written workmanship warranty — meaning if you sell the home, the warranty goes with it. That's a real selling feature.

When NOT to do exterior

If access is impossible (against a neighbour's wall, under a major addition or deck you can't disturb), interior is your answer. We'll tell you straight.

Get a free inspection in Markham

If you've noticed dampness, cracks, or musty smells in your basement, don't wait. We offer free on-site inspections across Markham, Unionville, Cornell, Berczy Village, Cathedraltown, Markville and Thornhill — and our work is backed by a written workmanship warranty.