Exterior Basement Waterproofing in Markham — The Permanent Fix
Outside basement waterproofing stops water from entering your foundation in the first place. We excavate, apply a heavy-duty rubberized membrane and dimple board, and install new weeping tile. The permanent solution for chronic wet basements — backed for life.
Signs you need exterior basement waterproofing
- ✓Chronic wall seepage that interior fixes haven't solved
- ✓Visible foundation cracks on the outside of the home
- ✓Deteriorated old asphalt parging or dampproofing
- ✓Planning to finish the basement and want it done right
- ✓Selling soon and want a written workmanship warranty
Written Workmanship Warranty
Our work is backed for life — and the warranty stays with the home if you sell. That's a real selling feature when you list your Markham property.
Free, no-pressure inspection
A real local technician comes out, diagnoses the actual source, and gives you a written fixed-price quote. We'll tell you if you don't even need us yet.
Our process
Locate utilities
Mark gas, hydro, water, telecom — protect your lawn.
Excavate to footing
Hand-dig along the affected wall, typically 6–8 ft.
Membrane + dimple board
Rubberized waterproofing with high-impact drainage board.
New weeping tile + backfill
Re-grade the surface to slope away from your home.
Mold from a damp basement isn't just ugly — it's dangerous.
Hidden mold spores from a wet basement are linked to asthma attacks, chronic coughs, allergies and serious respiratory illness — especially in kids, seniors and anyone with a weak immune system. Every day you wait, it spreads further into your walls, insulation and air.
"Two prior 'waterproofing' companies sold us interior fixes that didn't last. This team did proper exterior membrane on the south wall — three winters dry now. Wish we'd called them first."
Frequently Asked Questions
What is exterior basement waterproofing?+
Exterior basement waterproofing means excavating along the foundation down to the footing, cleaning the wall, applying a heavy-duty rubberized waterproofing membrane plus a dimple board, installing new weeping tile, and re-grading. It stops water before it ever touches your foundation.
Why is exterior considered the permanent fix?+
Because it prevents water from entering at all, instead of managing water that has already entered. Done with modern materials, it lasts 30+ years and carries our written workmanship warranty.
How much does exterior basement waterproofing cost?+
Roughly $300–$500 per linear foot depending on excavation depth, access, soil conditions, and landscaping restoration. A typical single-wall job (25–35 ft): $9,000–$17,000.
How long does the work take?+
Most single-wall exterior jobs take 2–4 days including excavation, membrane, weeping tile, and backfill. We protect your landscaping and restore the surface when done.
Do you offer a warranty?+
Yes — written workmanship warranty. It stays with the home if you sell, which is a real selling feature on the Markham market.
Wet basement? Don't wait.
Every day water sits in your basement, mold spreads and your foundation weakens. Talk to a real Markham waterproofing expert today — free advice, no pressure.