How long does exterior waterproofing take?

Most projects finish in 5–8 days, depending on home size and soil conditions.

Do I need municipal permits?

Many St. Catharines neighborhoods require permits; McDowell handles all paperwork.

Will my landscaping survive excavation?

Yes—we protect and fully restore all landscaping and hardscapes.

Can I combine interior and exterior systems?

Absolutely—dual systems offer maximum defense against groundwater and leaks.

How often should I maintain the system?

Annual visual checks and sediment flushing every 2–3 years keep it optimal.

Exterior Basement Waterproofing Services in St. Catharines

What Is Exterior Basement Waterproofing?

Exterior basement waterproofing prevents groundwater from ever reaching your foundation walls by excavating around the perimeter, applying a robust waterproof membrane, installing drainage components, and regrading the soil. This approach tackles leaks at their source—unlike interior fixes that manage water only after it enters the basement.

Why St. Catharines Homes Need Exterior Protection

St. Catharines’s unique conditions make basements vulnerable::

● High Water Table Near Lake Ontario & Twelve Mile Creek: Groundwater often sits within inches of your footing, making basement waterproofing in St. Catharines a necessity.

● Lake-Effect Precipitation & Spring Thaw : Sudden downpours—especially near Port Dalhousie and Merritton—can overload soils, causing wet basement issues.

● Clay & Silt Soils: Locally, heavy clay retains moisture, increasing hydrostatic pressure against walls, often requiring foundation repair.

● Freeze–Thaw Cycles: Winter temperatures cause water in foundation materials to freeze and expand, widening cracks over time unless treated with interior basement waterproofing.