Basement Waterproofing in North York
Below-grade water intrusion is common in North York's older housing stock and its 1970s-era mid-rise buildings. We identify the source and apply the right system, not just a surface coating.
Basement Waterproofing in North York, 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 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 5Had 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.
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.
They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
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.
Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
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.
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 North York.
In homes of that era, the most common sources are foundation cracks (especially at cold joints), failed parging on block foundations, and window well drainage failure. We inspect before recommending an approach.
Yes. We work on parking-level waterproofing systems including traffic-bearing membranes, joint systems, and crack injection. We have experience with mid-rise and commercial parking structures throughout North York.
It depends on the failure mode and site conditions. Exterior waterproofing addresses the source but requires excavation. Interior systems manage water after it enters. We explain both options honestly and recommend what's appropriate for your situation.
Interior crack injection or drainage mat installation is typically 1-2 days. Exterior excavation and membrane application on a residential foundation is 3-5 days depending on scope.
Yes. Depending on the system installed, we provide transferable written warranties. We'll explain the terms clearly before work begins.
For active leaks at a cold joint or vertical crack in a 1950s-60s poured foundation, we typically use epoxy or polyurethane injection from the interior. Where the crack is wide, horizontal, or tied to exterior grading and downspout issues, exterior excavation and membrane repair is the more durable fix.
Hairline vertical cracks from concrete shrinkage are common in 60-70 year old foundations and are usually cosmetic. Homes on ravine-adjacent lots near Hoggs Hollow, where clay soils hold more water against the foundation, tend to see more hydrostatic pressure and wider cracking over time.
Interior injection for a single crack typically runs $500 to $1,500. Exterior excavation and membrane repair for a section of foundation wall is priced by linear footage and depth once we've assessed grading and soil conditions.
Usually not if the cause is gradual seepage or settling, that's treated as a maintenance issue. Sudden water entry tied to a specific storm or municipal sewer backup is more likely to be covered. We can document conditions to support a claim either way.
A sump pump collects groundwater in a basin below the slab and discharges it away from the foundation before it can seep in. Homes near Don Valley Village and other areas close to the Don River's tributary creeks often have a higher water table and benefit from one, especially where the home lacks modern weeping tile.
Most residential sump pumps last 7-10 years with normal use. Replacement, including the check valve and discharge line, typically runs $600-$1,500 installed. We recommend testing yours every spring before the snowmelt season.
North York's post-war homes were built on poured concrete foundations that are now 60-70 years old. Cracks, cold joints, and failed parging are the entry points for water in these basements. A sump pump manages the symptom; waterproofing addresses the source.
Mid-rise and commercial buildings in North York, particularly in the Yonge-Sheppard corridor, often have underground parking structures with aging joint systems, failed crack injections, and drainage membrane failures. These repairs require different methods and materials than residential basement waterproofing. We do both.
Basement Waterproofing for North York's Older Housing Stock
North York's post-war bungalows and semis were built with construction standards of the 1950s, which means poured concrete or concrete block foundations, minimal damp-proofing, and no modern drainage systems. After 60-70 years, these foundations develop cracks at cold joints, at window penetrations, and where parging has failed.
We approach basement waterproofing in these homes the same way we approach roofing: diagnose first. The right repair for a horizontal crack in a poured wall is different from the repair for a leaking block wall or a failed window well. We don't apply one system to everything.
Parking Structure Waterproofing in North York
The 1970s and 80s mid-rises along Yonge, Sheppard, and the surrounding corridors in North York were built with underground parking structures that are now showing their age. Joint systems fail. Traffic membranes delaminate. Crack injections from previous repairs often need to be redone properly.
We work with property management companies and condominium boards to assess, repair, and document parking-level waterproofing. Our reports are formatted for reserve fund discussions and board presentations.
The Buried Creeks Under North York Basements
Some North York water problems are older than the houses standing over them. The borough is cut by tributaries of the Don, and the drainage they created did not disappear when the subdivisions went in. Wilket Creek runs through Bayview Village, German Mills Creek passes near Newtonbrook, and Hoggs Hollow sits in a ravine that collects what the land above it sheds. Homes on and near those routes sit on a higher water table than neighbours a few streets away, which is why one basement on a block floods and the rest never do.
This matters because it changes the correct repair. A foundation taking water under sustained groundwater pressure will keep finding a way through no matter how many cracks get injected, and the honest answer there is drainage and pressure relief rather than another round of sealing. Older bungalows on these routes frequently have no weeping tile at all, or have clay tile that silted up decades ago. We check where the house sits before recommending a system, because the address does more to determine the right answer here than the age of the foundation does.
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.