Exterior Foundation Waterproofing in London, Ontario
The full excavation and waterproofing process stops water at the foundation wall. We excavate, prepare the wall, apply proven membrane systems and renew below-grade drainage for long-term protection.
When Exterior Waterproofing Is Recommended
Exterior Waterproofing Addresses Water at the Source
Exterior waterproofing addresses water at the source - outside the foundation wall. It's recommended when:
- Water is saturating and entering through the foundation wall
- Existing weeping tile has failed or is clogged
- The wall requires membrane protection from groundwater
- Interior access is limited or finished
- You want to prevent water from reaching the wall
Components of an Exterior Waterproofing System
Hover over each component to see how the layers of an exterior waterproofing system work together to stop water at the foundation wall.
System Component
Waterproof Membrane Coating
A heavy-duty rubberized waterproof sealant is applied directly to the cleaned foundation wall, creating a continuous barrier against groundwater.
A heavy-duty rubberized waterproof sealant is applied directly to the cleaned foundation wall, creating a continuous barrier against groundwater.
- Seals the wall against water penetration at the source
- Bridges minor cracks and surface defects
- Bonds directly to cleaned, repaired concrete
A dimpled air-gap drainage membrane is installed over the waterproof coating to channel water down to the weeping tile, relieving hydrostatic pressure.
- Creates an air gap that relieves wall pressure
- Directs water downward to the footing drain
- Protects the membrane during backfill
New perforated weeping tile wrapped in filter cloth is laid in clean drainage stone along the footing to collect and carry groundwater away.
- Filter cloth prevents silt and root intrusion
- Clean washed stone ensures free water flow
- Connects to sump pit or municipal storm line
The trench is backfilled and the final grade is sloped away from the foundation so surface water sheds away rather than toward the wall.
- Graded to shed surface water away from the wall
- Restores landscaping and access after excavation
- Completes the exterior water-management system
How Exterior Waterproofing Works
Exterior waterproofing stops groundwater before it touches your foundation. By excavating down to the footing, repairing wall defects, applying dual-membrane barriers, and renewing below-grade drainage, your home stays completely dry.
Foundation Preparation
Excavated walls are thoroughly cleaned and inspected. Cracks are repaired so membranes bond seamlessly.
Dual Membrane Protection
A waterproof barrier seals the wall, while a dimpled drainage membrane directs water down toward weeping tile.
Drainage Renewal
New weeping tile and clear drainage stone safely channel groundwater to the sump pit or storm connection.
Exterior vs. Interior
Exterior stops water at the wall before penetration, ideal when walls show saturation or interior access is limited.
Installation Process Roadmap
Our systematic 6-step process guarantees long-lasting exterior foundation protection:
Perimeter Excavation
Careful excavation along the foundation wall down to the footing level.
Wall Cleaning & Crack Repair
Pressure washing, inspection, and sealing of structural cracks and masonry voids.
Waterproof Membrane Application
Applying heavy-duty rubberized waterproof sealant over exterior walls.
Dimple Drainage Board
Installing air-gap drainage membrane to direct ground water downwards.
Weeping Tile Replacement
Laying new perforated drainage pipe wrapped in protective filter cloth.
Drainage Stone & Backfilling
Backfilling with clean washed gravel and sloping final grade away from the foundation.
Frequently Asked Questions
Frequently Asked Questions
Stop Water Before It Causes More Damage
Whether you're dealing with a foundation crack, recurring basement seepage, drainage issue or failed sump pump, our London team will inspect the site and deliver a guaranteed solution.