York · Basement Waterproofing

Basement Waterproofing in York

York's 1920s to 1950s foundations develop predictable cracks and joint failures. We find the entry point and waterproof it properly.

Freshly coated underground parking deck with new line striping between the columns
25+Years on GTA roofs
60 minEmergency response
Licensed& fully insured
YorkLocal expertise
What we address

Basement Waterproofing in York, what we fix.

01

Basement leaks

02

Below-grade waterproofing

03

Sump pump installation

04

Balcony leaks

05

Terrace leaks

06

Underground parking waterproofing

The difference

Why our waterproofing actually holds.

“The right waterproofing system depends on what's actually failing. We find that out first.”

Rated 5 out of 5

Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.

Toronto, ON·Google
Rated 5 out of 5

They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.

North York, ON·HomeStars
Rated 5 out of 5

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.

Toronto, ON·Google
Rated 5 out of 5

Luciano did not try to sell me a new roof. Appreciated the honesty — he showed up when he said he would.

Etobicoke, ON·Google
Rated 5 out of 5

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.

Scarborough, ON·Google
Rated 5 out of 5

Flat roof replacement on a commercial unit. Clean, fast, no surprises on the invoice. The crew left the site cleaner than they found it.

Mississauga, ON·GuildQuality
Rated 5 out of 5

Called after a storm damaged our roof. Someone was on site within hours, tarped everything, and had us fully repaired before the next rain.

Vaughan, ON·HomeStars
Rated 5 out of 5

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.

North York, ON·Google
Rated 5 out of 5

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.

Richmond Hill, ON·HomeStars
1 / 9
Roofing & Waterproofing Since 1999

Our Work.

Where We Work

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.

FAQ

Basement Waterproofing questions for York.

Crack injection runs $500 to $1,500. Interior perimeter systems run $5,000 to $15,000. Written quote after inspection, and on many York houses the first items we price are the cheaper outside fixes to downspouts and grading.

For many York homes, yes, interior drainage manages water that enters and directs it to a sump. For persistent active leaks, exterior is sometimes better. We'll tell you which applies.

Yes, a written warranty tied to the system being installed, with its terms handed to you before work begins. Crack injection, an interior drainage run, and a sump pump installation are each covered on their own terms, so you know exactly what is protected.

Surface drainage often contributes to basement moisture. We assess the full picture: how the lot slopes, where each downspout lets go, whether the window wells drain, and whether the grading on the house next door is sending water your way, which on narrow York lots between semis happens a lot.

Typically within a few business days. If water is actively coming in, call the 24/7 line instead and it is handled as an emergency, and in either case the inspection report goes out no later than 24 hours after we leave.

That is sewer surcharge, not a waterproofing failure, and it is important to identify correctly because the fix is completely different. During intense rainfall the municipal system can fill faster than it drains, and once the line is under pressure it pushes back into the lowest opening in your house, which is the floor drain or a basement fixture. Waterproofing the walls does nothing about it. The relevant measures are a backwater valve on the sanitary line, adequate sump and pump capacity, and disconnecting any storm water that is being fed into the sanitary system.

Yes. The City of Toronto runs a basement flooding protection subsidy that can offset part of the cost of eligible work such as backwater valve installation, sump pump installation, and severing a storm connection from the sanitary line. Terms, eligible items, and the amount are set by the City and change from time to time, so confirm the current details with them directly. We mention it because a meaningful share of York owners we assess qualify for it and are unaware it exists, and because it applies to exactly the measures that address surcharge.

Elevation and infrastructure, in roughly that order. The low ground along the Black Creek corridor and through parts of Rockcliffe-Smythe both collects surface water and sits at the wrong end of a storm system under load, so the same rainfall event that a house on higher ground sheds without incident arrives at yours from two directions at once. It is also why the fix is often drainage and surcharge protection rather than membrane. We assess your specific position rather than applying what worked elsewhere in the neighbourhood.

It depends entirely on what the wall is made of. Poured concrete with a discrete crack is the ideal candidate, and polyurethane or epoxy injection is a genuinely economical repair there. A brick or early block foundation offers no single crack to fill, because the water is coming through tired mortar joints right across the wall. On those walls injection is the wrong tool and anyone selling it should be questioned. We identify the wall type first and tell you which category you are in.

Usually the exterior work, and we will look at it before quoting anything invasive. On York lots we constantly find downspouts dumping water at the base of the wall, window wells whose drains quit years ago, and flower beds that have sunk toward the house, and each of those costs far less to correct than any interior system. Where a house of this age has downspouts tied into original clay weeping tile, disconnecting them and discharging well clear of the foundation is sometimes the whole remedy. We would rather establish that first than sell you a perimeter system you did not need.

In Depth

York's older housing stock has foundation waterproofing that was minimal at best when built. After 70 to 100 years, cracks, failed parging, and joint deterioration are common entry points for water.

There is a second mechanism in York that gets misdiagnosed as a foundation problem more often than anywhere else we work, and it is sewer surcharge. Parts of York, particularly the low ground through Rockcliffe-Smythe and the Black Creek corridor, sit on combined or undersized storm infrastructure that can back up during intense rainfall. When that happens water arrives through floor drains and plumbing fixtures rather than through the walls, and no amount of exterior membrane will stop it. The remedies are different: a backwater valve, sump and pump capacity, and severing any storm connection feeding the sanitary line.

Distinguishing surcharge from groundwater from surface water is the first thing we do, because all three present as a wet basement and each has a different and non-interchangeable fix. We assess before we propose. The right fix depends on the failure mode.

Basement Waterproofing for York's Older Homes

York's oldest housing stock, 1920s and 30s construction, has foundations that have now been in the ground for nearly a century. Cracks, joint failures, and degraded parging are inevitable at this age.

We repair these failures with appropriate systems for the building's age and condition, which means identifying the wall type before choosing a method. Poured concrete, stone rubble, and early brick foundations all fail differently and take different repairs, and the single most expensive mistake we are asked to correct is a system that was sold without that distinction being made.

Groundwater, Surface Water, and Sewer Surcharge

A wet York basement has three plausible causes and they are not interchangeable. Groundwater creeps in at the footing or along the floor joint, builds over days, and is at its worst in a long wet stretch. Surface water turns up within the hour of a hard rain at the same place every time, and leads back to a downspout, a window well, or the slope of the yard. Sewer surcharge comes up through the floor drain or a fixture during intense rainfall, when the municipal line is under pressure.

The reason we insist on establishing which one you have is that each has its own remedy and none of them addresses the others. A membrane does nothing about surcharge. A backwater valve does nothing about groundwater. Regrading does nothing about a failed foundation wall under hydrostatic load.

On the low ground along Black Creek and through Rockcliffe-Smythe, sewer backup and surface water between them explain a large share of the calls we get, and the fix is often cheaper than the owner had braced for. When that is true of your house, the estimate will say so plainly.

Waterproofing Options for York Property Owners

York property owners often need to balance repair effectiveness against budget. We explain interior and exterior options honestly, including the trade-offs, so you can make an informed decision.

We don't oversell the most expensive system when a targeted repair will serve you just as well. That includes telling you when the effective first step is outside the house entirely, and pointing out where the City's basement flooding protection subsidy may offset eligible work. Written warranty terms are set out before anything begins, and the quote is itemized so it is clear what each element is buying.

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.

Call us directly

(647) 383-8664

Book online

Book a free estimate