YTZ Basement Waterproofing Toronto
Interior Basement Waterproofing Toronto
An interior perimeter drainage system collects water that seeps through foundation walls and routes it to a sump pump.
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What is interior waterproofing?
Interior basement waterproofing manages water that reaches the inside of the foundation. A drainage channel is installed along the perimeter, wall membrane directs seepage downward, and the system routes water to a sump pump. It can be a practical option where outside excavation is difficult or disruptive.
The correct solution depends on the entry point, floor/wall joint, foundation type, existing pump, and condition of the basement. The real interior waterproofing photographs in the gallery show membrane and channel work in progress.
Signs you need interior waterproofing
Water at the floor joint
A wet line where the floor meets the wall is a common drainage concern.
Damp basement walls
Moisture, staining, or efflorescence may indicate water moving through the wall.
Limited exterior access
Attached homes and finished yards can make an interior system the more practical approach.
Failed old drainage
An older system may need an assessment before it can be repaired or extended.
Our process
- 1. Assess
Locate the entry point and check the existing drainage.
- 2. Open the perimeter
Prepare the floor edge for the drainage channel.
- 3. Install membrane and drain
Direct water toward the sump system.
- 4. Restore
Finish the concrete edge and clean the space.
What does it cost?
A typical interior drainage system in Toronto runs about $8,000–$15,000 depending on the perimeter length and floor work. You get the exact price after a free inspection.
Get my free quoteInterior Waterproofing FAQ
Will an interior system leave my basement torn up?
The crew breaks the floor along the perimeter to install the drain and gravel, then pours new concrete over the channel. You are left with a finished concrete trench edge, not an open ditch.
Does interior waterproofing stop water coming through the wall?
It manages water that gets through, rather than sealing the outside. A dimple membrane on the wall directs water down into the drain so it never reaches your floor.
How long does an interior system take?
Most single-family homes are completed in 2–4 working days, depending on the perimeter length and access.
Related services
Sump Pump Installation
A sump pump collects water from interior drainage and lifts it outside, away from your foundation.
Foundation Crack Repair
Injection repair seals cracks in poured concrete walls from the inside, stopping active leaks without excavation.
Toronto Flooding Rebate →
See if your work is eligible for up to 80% back from the City of Toronto.
Wet basement? Book a free inspection
Open 24/7 · Open 24 hours, 7 days a week