Basement Waterproofing in Don Mills
Don Mills was built into a ravine system, and where a house sits relative to that drainage decides most of what happens in its basement.
Basement Waterproofing in Don Mills, what we fix.
Basement leaks
Below-grade waterproofing
Sump pump installation
Balcony leaks
Terrace leaks
Underground parking waterproofing
Why our waterproofing actually holds.
Diagnose first
System-matched materials
Written warranties
Full documentation
Interior & exterior
Parking structure expertise
Diagnose first
We identify the actual entry point and failure mode before recommending a waterproofing system. The right system depends on the diagnosis.
System-matched materials
We specify and install waterproofing systems appropriate to the failure mode, not a one-size coating over everything.
Written warranties
Our waterproofing warranties are written, clearly explained before work begins, and transferable to future property owners.
Full documentation
Written inspection reports and completion documentation suitable for insurance, lenders, and reserve fund files.
Interior & exterior
We explain interior and exterior waterproofing options honestly, with the trade-offs, and recommend what's appropriate for your situation.
Parking structure expertise
Parking deck waterproofing, joint systems, and traffic membranes, commercial-grade capability applied to residential and commercial buildings.
“The right waterproofing system depends on what's actually failing. We find that out first.”
“The right waterproofing system depends on what's actually failing. We find that out first.”
Rated 5 out of 5Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
Rated 5 out of 5They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
Rated 5 out of 5I emailed at 4 a.m. and spoke with someone that same day. Estimate and completed work all within one day. Pricing was fair, work was excellent.
Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
I emailed at 4 a.m. and spoke with someone that same day. Estimate and completed work all within one day. Pricing was fair, work was excellent.
Luciano did not try to sell me a new roof. Appreciated the honesty — he showed up when he said he would.
We had a leak diagnosed by two other contractors who could not find the source. Blue Knight found it on the first visit and fixed it the same week.
Flat roof replacement on a commercial unit. Clean, fast, no surprises on the invoice. The crew left the site cleaner than they found it.
Called after a storm damaged our roof. Someone was on site within hours, tarped everything, and had us fully repaired before the next rain.
Had a slow basement leak for years. Every other company just caulked it. Blue Knight found the actual source and did a proper waterproofing job. No issues since.
Our neighbours recommended them for a valley repair. Small job, but they treated it like it mattered — showed up on time, matched the shingles perfectly, and charged exactly what they quoted.
Featured Projects.
Rooftops across the GTA.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
Rooftops across the GTA.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
Basement Waterproofing questions for Don Mills.
Interior systems run $100 to $250 per linear foot and exterior excavation with membrane runs $250 to $450 per linear foot. A single crack injection starts around $400. Most properties do not need the full perimeter treated, and the written quote covers only what the diagnosis supports.
Frequently, and it changes what the correct repair is. A property receiving water from uphill is dealing with flow rather than static pressure, and the fix often starts outside with grading, swales, and downspout routing rather than inside with a system. We look at where the house sits before we look at the wall.
Active non structural cracks are typically injected with polyurethane or epoxy resin from inside, sealing the void the water is travelling through in a few hours. Where the crack is being worked open by ground movement or ongoing pressure, injection alone will be followed by a new crack, so we pair it with drainage improvements outside.
Yes. The mid-rise apartment and institutional stock around Don Mills and Flemingdon Park carries below grade parking, much of it on original or first replacement membrane. Traffic bearing systems, expansion joints, and crack injection, with reports formatted for reserve fund studies.
Interior crack injection is usually a few hours and an interior perimeter system one to two days. Exterior excavation on a residential foundation runs three to five days, and ravine lots frequently take longer because access for equipment is tighter than on a flat lot.
Yes, written and specific to the system installed, handed over before work begins rather than afterwards. Terms differ between a crack injection, an interior perimeter system, and exterior work, so we go through what is actually covered instead of leaving you to find the limits when you need them.
The Don Mills street plan follows the ravines rather than a grid, and that was a design decision with lasting consequences below grade. Properties sit at meaningfully different elevations within a short distance, and the ones lower in the drainage path deal with water that the ones above them shed.
The foundations themselves are 1950s poured concrete, now seventy years old. They were built with minimal damp proofing by current standards and no drainage membrane, so the entry points are the ones that era produces: cold joints, cracks that opened as the concrete cured and the ground settled, and window wells that were never drained properly in the first place.
Living in a Drainage System
Don Mills was planned around its ravines rather than over them, which is one of the reasons it is a pleasant place to live and one of the reasons its basements behave unpredictably. Two houses a hundred metres apart can be several metres apart in elevation, and the lower one inherits whatever the upper one sheds.
So the first question on a wet basement here is not how old the foundation is. It is where the property sits in the local drainage, what the grading around it does now compared to what it did in 1955, and whether the downspouts are discharging into that path or away from it.
Seventy Year Old Foundations
Poured concrete from the 1950s is generally sound material, and most of these foundations are structurally fine. What they lack is everything that came later: drainage membrane, functioning weeping tile in many cases, and any coating rated for pressure rather than for moisture.
That means the repair is usually about managing water rather than rebuilding a wall, and it means the cheap explanations are worth ruling out first. Window wells without drains and grading that has settled toward the house over seven decades account for a large share of what we are called about, and both cost a fraction of a system.
We also cover nearby cities.
Ready to schedule your estimate?
We come to you, assess the roof, and give you a written quote. You are not obliged to proceed. Most estimates completed same week.