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Protects your foundation from the outside by stopping water at the source before it reaches your basement.
Exterior basement waterproofing is the most comprehensive foundation protection available, and in our experience, it is the only method that truly stops water from contacting your foundation walls. We have been excavating Toronto foundations for over two decades, and the reality we see time and again is this: the original dampproofing applied during construction — typically a thin coat of asphalt-based parging — was never designed to be a waterproofing system. It was designed to resist moisture, not liquid water under hydrostatic pressure. After 40 to 60 years in Toronto's clay soil, that coating has cracked, peeled, and failed on virtually every home we dig up.
Why Choose Us
Our exterior waterproofing process starts with careful excavation down to the foundation footing — typically 6 to 8 feet deep for Toronto's standard residential foundations. We protect landscaping, walkways, and utility lines throughout the process. Once the wall is exposed, we power-wash it clean and repair any cracks using hydraulic cement for active leaks or epoxy injection for structural cracks. We then apply a rubberized asphalt waterproofing membrane — products like Blueskin WP 200 or Bituthene 3000 — which is a self-adhering, flexible sheet membrane that bridges hairline cracks and remains waterproof through years of foundation movement and freeze-thaw cycling.
Don't Ignore the Signs
On top of the membrane, we install a dimpled drainage board — a rigid, high-density polyethylene sheet (such as Platon foundation wrap or Delta-MS) with raised dimples that create an air gap. This board serves a dual purpose: it protects the membrane from backfill damage, and it channels any water that reaches the wall straight down to the weeping tile at the footing. Speaking of weeping tile — we always replace the old clay or concrete drain tile with modern 4-inch perforated PVC pipe wrapped in filter fabric, bedded in 3/4-inch clear stone. Toronto's clay-heavy soil is notorious for clogging old weeping tile systems, and replacing them during an exterior job adds decades of reliable drainage.
Toronto's climate presents unique challenges for exterior waterproofing. Our freeze-thaw cycle — temperatures cycling above and below zero roughly 40 to 50 times per winter — causes soil to heave and contract, putting enormous lateral pressure on foundation walls. The Leda clay soil common throughout Toronto, Scarborough, and the inner suburbs absorbs water like a sponge and can exert several thousand pounds of pressure per square foot against a foundation wall. This is why we use flexible membranes rather than rigid coatings, and why proper drainage is absolutely essential. Without a functioning weeping tile system, even the best membrane will eventually be overwhelmed by hydrostatic pressure.
We also pay close attention to grading and surface drainage during backfill. The Ontario Building Code (OBC Section 9.14.6) requires the finished grade to slope away from the building at a minimum of 5% for the first 1.5 metres. We use granular 'A' backfill against the wall — not the excavated clay — to ensure water drains freely to the weeping tile rather than pooling against the membrane. If your property requires it, we also integrate French drains to manage surface water before it reaches the foundation. Exterior waterproofing is the most involved solution we offer, but when done properly, it gives you 25+ years of worry-free protection and is the approach we recommend for any Toronto home with chronic foundation water issues.
Materials & Methods
Self-adhering, flexible waterproofing membrane (Blueskin WP 200, Bituthene 3000) applied directly to cleaned and primed foundation walls. Bridges hairline cracks and remains flexible through freeze-thaw cycles, providing a continuous waterproof barrier from footing to grade.
Rigid high-density polyethylene sheets (Platon, Delta-MS) with raised dimples installed over the membrane. Protects the membrane during backfill, creates an air gap for drainage, and channels water vertically to the weeping tile at the footing level.
4-inch perforated PVC pipe wrapped in geotextile filter fabric, laid in a bed of 3/4-inch clear crushed stone alongside the footing. Sloped to daylight or to an interior sump pit to collect and remove groundwater before it builds hydrostatic pressure.
Fast-setting hydraulic cement applied to active leaks and surface defects on the exposed foundation wall before membrane application. For structural cracks, two-part epoxy injection restores the concrete's original tensile strength before the exterior membrane is applied.
Our Process
We evaluate your property's grading, soil conditions, and foundation to determine the best exterior approach.
We carefully excavate around your foundation walls down to the footing, protecting landscaping where possible.
We apply waterproof membranes, install new weeping tile, and set up drainage boards for complete protection.
We backfill with proper drainage material, restore grading, and return your landscaping to its original condition.
Transparent Pricing
Honest pricing with no hidden fees. Every quote is customized to your specific needs.
| Service | Price Range |
|---|---|
| Membrane application | $70 – $150/linear foot |
| Coating application | $50 – $120/linear foot |
| Drainage systems | $80 – $180/linear foot |
| Complete exterior package | $7,000 – $15,000+ |
Prices vary by project scope. Get an accurate quote with a free inspection.
Get Your Free QuoteClient Reviews
“Outstanding job! My basement is finally dry thanks to your team. No more musty smell or moisture problems. A+ service!”
“From the initial appointment to final inspection, service was exceptional. Prompt, professional, and results exceeded expectations.”
“Professional and friendly staff. They solved our leaky basement in no time. The results were fantastic. Basement has been leak-free since the work was done.”
Experience & Expertise
Related Solutions
Seals your basement walls and floors from the inside to stop water infiltration and prevent moisture damage.
Learn More →New weeping tile installation and replacement to restore proper drainage around your foundation.
Learn More →Complete foundation waterproofing solutions to protect your home's structural base from water damage.
Learn More →Service Areas
We provide exterior waterproofing throughout Toronto and the Greater Toronto Area.
Common Questions
