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Foundation Waterproofing Across Toronto & GTA
OCM provides exterior foundation waterproofing for new builds, retrofits, and basement-leak repair across the GTA. Dimple board, modified-bitumen membrane, weeping tile, and proper backfill — done right the first time so your basement stays dry for the next 25+ years.
Waterproofing Services We Provide
- Exterior waterproofing for new construction — dimple board + membrane on green concrete.
- Retrofit exterior waterproofing — excavate, repair cracks, apply membrane, install drainage.
- Weeping tile installation / replacement — perforated pipe to weeping tile inspection point or sump.
- Foundation crack repair — polyurethane injection from outside (the only permanent fix).
- Window well installation and drainage.
- Sump pit and pump installation indoor + exterior.
- Basement walk-out waterproofing for walk-up basement conversions.
- Interior drainage and sub-floor systems when exterior excavation isn’t possible.
Our Waterproofing Process
- Free on-site assessment within 24 hours. We identify water source, cracks, and existing drainage.
- Excavation down to the footing — full wall exposure.
- Foundation prep — clean, repair cracks with polyurethane injection.
- Membrane application — modified bitumen (Blueskin or equivalent) over the entire wall.
- Dimple board installation — Delta-MS or equivalent — for an air-gap and second water-shedding layer.
- Weeping tile install at footing — perforated pipe wrapped in geotextile, daylighted or pumped.
- Drainage stone — 12 inches of clean gravel above weeping tile.
- Backfill in lifts with compaction.
- Final grade sloping 1-2% away from foundation.
Typical Waterproofing Costs in the GTA
Exterior waterproofing of a single wall runs $3,500-$8,000 in the GTA. Full-perimeter exterior waterproofing $12,000-$28,000 depending on home size, depth, and access. Weeping tile-only replacement $3,000-$8,000. Foundation crack repair from outside $400-$900 per crack. Sump pit/pump install $1,200-$2,500. Interior drainage system $80-$150 per linear foot. Call 416-317-3090 for a quote.
Why GTA Homeowners Choose OCM for Waterproofing
- Exterior waterproofing only — the permanent solution, not interior "diversion" systems.
- Blueskin or equivalent modified-bitumen membrane on every job.
- Dimple board + weeping tile — full system, never shortcuts.
- 10-year leak-free warranty on full-perimeter waterproofing.
- Licensed, fully insured, WSIB-covered.
- Free assessments within 24 hours.
- Financing available on projects over $5,000.
Recent Foundation Waterproofing Projects
Real-world example: case study: Richmond Hill walk-up basement foundation excavation — same trade-offs in action.
Foundation Waterproofing FAQ
Interior vs exterior waterproofing — which is better?
Exterior. Interior systems divert water that’s already in your foundation; exterior stops water before it ever reaches the concrete. Exterior is more disruptive and costs more, but it’s the only permanent fix.
How long does exterior waterproofing last?
Done right with modified-bitumen membrane + dimple board + weeping tile: 25-40+ years. Our warranty is 10 years; actual lifespan is much longer.
Will my landscaping be destroyed?
Some excavation is necessary. We protect what we can, work efficiently, and include landscape restoration in every quote. Sod, plants, walkways — we put it back.
How long does a full-perimeter waterproofing job take?
Single side of a typical house: 3-5 days. Full perimeter: 7-12 working days. Weather and soil conditions matter.
Can you fix a single crack without doing the whole foundation?
Yes — polyurethane injection from outside repairs single cracks in a half-day for $400-$900. We only recommend full waterproofing if there are multiple cracks or the existing membrane has failed.
Do you handle the landscape restoration?
Yes — every quote includes putting the lawn, shrubs, and walkways back where they were. We don’t leave you with a mud pit.
Related Services
- Excavation Services — Full excavation services.
- Trenching — Weeping tile and drainage trenching.
- Site Preparation — New construction site prep including waterproofing.
- Land Grading — Grading away from foundation — essential for dry basement.
- Get a Free Quote — Schedule your on-site visit.
Get Your Free Foundation Waterproofing Quote Today
Call 416-317-3090 or request a free quote online. We’ll visit your property, discuss your project, and have a written quote in your inbox within 24 hours.
Related Services in Toronto
- Foundation Waterproofing in Burlington
- Foundation Waterproofing in Newmarke
- Foundation Waterproofing in Vaughan
- Foundation Waterproofing in Toronto
- Drainage & French Drain in Toronto
- French Drain Installation in Auror
- Sump Pump Installation in Toronto
- Basement Underpinning in Toronto
- Window Well Installation in Toronto
- Egress Window Installation in Toronto
in Toronto? Let’s talk.