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About Joint Seal
Toronto's concrete repair & waterproofing specialists
For over a decade, Joint Seal Waterproofing has provided concrete repairs and waterproofing services in Toronto, the GTA and the surrounding areas. We specialize in thin-patch applications and expansion joint injection.
High-strength concrete adhesives allow us to perform all concrete repairs from inside elevator pits and underground parking garages — saving on costs and avoiding disruptive excavation while ensuring long-lasting results. The use of polyurea-based waterproofing membranes restores the water impermeability of repaired concrete.
Our industrial-strength materials are tested to Ministry of Transportation Ontario (MTO) standards and rated to last 25 years — more than doubling the useful life of the structures we repair. We focus on difficult, high-end projects: structural restoration, crack injection, and non-structural expansion joint waterproofing.
How we work
- Interior access: most repairs are done from the inside, so no excavation.
- Diagnostics first: infrared scanning pinpoints moisture before we design the fix.
- Lasting materials: polyurea and polyaspartic membranes that cure fast and hold under pressure.
- Low-disruption: low-VOC, off-hours work for hospitals, shopping centres and occupied buildings.
Where we work
Based in Toronto and serving the GTA, Niagara, Hamilton, Waterloo, Kitchener, Ottawa and Montreal. Our portfolio spans condo towers, parking garages, Toronto Pearson and Hamilton airports, food-processing plants, and the Canadian Sport Institute of Ontario.