Basement Waterproofing in Forest Hill
Foundations of stone, early brick, and 1920s concrete need waterproofing methods that respect how those walls were actually built.
Basement Waterproofing in Forest Hill, 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 Forest Hill.
Interior systems run $100 to $250 per linear foot and exterior excavation with membrane runs $250 to $450 per linear foot. Heritage foundations worked in sections cost more than that range because the sequencing takes longer, and we explain why before quoting rather than presenting a higher number without a reason.
It can be, done correctly, and it is genuinely risky done the usual way. The soil bearing against a stone or rubble wall is part of what keeps it standing. Opening a long trench along it removes that support all at once. We work in short sections, backfilling each before opening the next, and we would decline the job rather than do it the fast way.
It depends on the failure. A single crack can usually be injected with very little disruption. An interior perimeter system requires opening the base of the walls all the way round, which means removing and rebuilding the bottom of the finish. We tell you which situation you are in before anything is opened up.
Yes. Properties running down toward the ravine sit lower in the local drainage and receive water moving through the ground from uphill rather than simply sitting against the foundation. That often responds to exterior grading and drainage work rather than an interior system, so it is worth diagnosing properly first.
Active non structural cracks in poured concrete are typically injected with polyurethane or epoxy resin from inside. Stone and rubble walls rarely have a single crack to inject at all, and the answer there shifts toward managing water across the whole wall with drainage rather than sealing a discrete point.
Yes, written and specific to the system installed, handed over before work begins. On heritage foundations we are also explicit about what the warranty does not cover, because a hundred year old wall will continue to behave like one and promising otherwise would be dishonest.
Forest Hill foundations predate every modern waterproofing assumption. Stone, early brick, and 1920s poured concrete are all present, frequently in the same house where additions came later, and none of them were built with drainage membrane, functioning weeping tile, or any coating rated for pressure.
That changes the method rather than only the price. A stone or rubble wall is partly supported by the soil bearing against it, so excavating a long run in one operation removes that support at the moment the wall is least able to spare it. Where exterior work is genuinely the right answer on a foundation of this age, it is done in short sections that are backfilled before the next is opened.
Why Method Matters More Than Product Here
Waterproofing marketing tends to focus on membranes and systems, as though the product decides the outcome. On a hundred year old foundation the sequencing decides the outcome, and the product is secondary.
Working in short backfilled sections rather than one long trench, understanding that a stone wall is a compression structure, and knowing when an interior system is the safer recommendation even though it is the less complete one: those are the decisions that separate a job that leaves the building sound from one that does not.
The Cheap Checks First
Before proposing anything substantial we rule out the inexpensive explanations, which on these properties are frequently the actual cause. Downpipes from a large roof area discharging beside the foundation deliver an enormous volume of water to exactly the wrong place. Window wells without functioning drains hold standing water against below grade windows that are often original timber.
Mature landscaping is the other one. Beds built up against the house over decades raise the grade above the original level and route surface water inward. Correcting that is gardening rather than waterproofing, and it sometimes solves the problem outright.
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.