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Comprehensive exterior foundation protection with membranes and drainage to prevent water from reaching your basement.
Exterior basement waterproofing stops water before it ever touches your foundation walls. The process involves excavating the soil around your home down to the footing, cleaning the foundation surface, applying a waterproof membrane, and installing new weeping tile drainage at the base. It is the most thorough waterproofing method available — and the only approach that addresses the root cause of basement water intrusion rather than managing symptoms from inside.
In the Greater Toronto Area, most homes built before 1990 relied on a single coat of tar (dampproofing) applied during construction. Tar is not waterproof — it's a moisture retarder that becomes brittle within 10-15 years and cracks under soil pressure. Once that coating fails, Toronto's clay soil holds water directly against the foundation, and hydrostatic pressure forces moisture through every pore, crack, and joint in the concrete.
Why Choose Us
The decision between interior and exterior waterproofing comes down to the source of the problem. If water enters primarily through wall cracks or through porous concrete above the footing, exterior waterproofing is the definitive solution. Interior systems can manage water at the floor level, but they cannot stop moisture from migrating through the wall itself — which leads to ongoing efflorescence, mould behind finished walls, and gradual concrete deterioration.
We recommend exterior waterproofing when foundation walls show horizontal cracks from lateral soil pressure, when the original weeping tiles have collapsed or clogged with sedite, or when homeowners plan to finish their basement and need confidence that walls will stay permanently dry. In our experience across thousands of GTA projects, homes that receive exterior waterproofing never need interior systems afterward.
Don't Ignore the Signs
Our exterior waterproofing process begins with careful excavation using compact equipment that minimizes damage to landscaping. We dig down to the foundation footing — typically 6 to 8 feet in Toronto homes — exposing the full wall surface. The concrete is power-washed and inspected for cracks, which are repaired with hydraulic cement or epoxy injection before the membrane goes on. We then apply a liquid-applied rubber membrane (Blueskin or equivalent) that bonds directly to the concrete, followed by a dimple drainage board that protects the membrane from backfill damage and creates a channel for water to flow downward to the weeping tile.
At the footing level, we remove the old clay or concrete weeping tile and replace it with modern 4-inch perforated PVC pipe wrapped in filter fabric. This drains to a sump pit or to daylight depending on your property's grading. The excavation is then backfilled with clear gravel for the first 12 inches to promote drainage, topped with native soil.
Exterior waterproofing is a larger investment than interior methods, but it delivers results that interior systems cannot match. The membrane physically blocks water from contacting your foundation, which means walls stay dry, concrete stops deteriorating, and you can finish your basement with complete confidence. For Toronto homes, where clay soil retains water for weeks after a single rainfall, this barrier is the difference between a permanently dry basement and an ongoing moisture problem.
Every exterior waterproofing project we complete includes a transferable 25-year warranty covering the membrane, drainage, and all labour. We also restore your landscaping after backfill and ensure proper surface grading slopes away from the foundation. The typical project takes 5-10 days depending on how many walls need treatment and site access conditions. We work through spring, summer, and fall — exterior excavation pauses only during deep frost when the ground becomes unworkable.
Materials & Methods
A seamless, spray- or roller-applied rubber membrane (Blueskin WP200 or equivalent) bonds directly to the foundation concrete, creating a continuous waterproof barrier with no seams to fail.
High-density polyethylene board with raised dimples installed over the membrane. It protects the membrane from backfill damage and creates a vertical drainage channel to the weeping tile.
Modern 4-inch perforated PVC pipe wrapped in geotextile filter fabric replaces old clay or concrete drainage tile. Drains to sump pit or daylight discharge depending on site conditions.
All foundation cracks are structurally repaired before membrane application — epoxy injection for structural cracks, hydraulic cement for non-structural gaps and honeycombing.
Our Process
We inspect your foundation, identify the scope of excavation, assess access conditions, and mark underground utilities before any digging begins.
Using compact excavation equipment, we dig down to the foundation footing (typically 6-8 feet) while protecting landscaping and structures.
The exposed foundation is power-washed and all cracks are repaired with hydraulic cement or epoxy injection before the membrane is applied.
A liquid-applied rubber membrane is bonded to the concrete, then a dimple drainage board is installed to protect the membrane and channel water down to the footing.
Old drainage is replaced with new 4-inch PVC weeping tile in filter fabric. The trench is backfilled with drainage gravel and native soil, and surface grading is restored.
Client 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
Professional weeping tile and French drain systems to redirect water away from your foundation.
Learn More →Complete foundation protection systems combining interior and exterior waterproofing methods.
Learn More →Professional crack injection and repair services to seal foundation cracks and prevent water intrusion.
Learn More →Service Areas
We provide exterior basement waterproofing throughout Toronto and the Greater Toronto Area.
Common Questions
