Professional Exterior Foundation Waterproofing Solutions Built to Last
Protect your home from water damage with long-term exterior waterproofing solutions.
At Kome Waterproofing and Underpinning Inc, we specialize in exterior foundation waterproofing that stops water at the source — before it enters your basement.
Licensed & Insured
Ontario Building Code Compliant
Free On-Site Estimates
Serving Toronto & GTA
Get a Free Exterior Waterproofing Estimate
Exterior waterproofing is the most effective method of protecting your foundation from water intrusion.
It involves excavating around the foundation walls and installing professional waterproofing membranes, drainage systems, and protective layers to prevent moisture from ever entering your basement.
Unlike interior solutions, exterior waterproofing addresses the problem at its source — outside your foundation — providing long-term protection and peace of mind.
What Is Exterior Waterproofing?
Signs You Need Exterior Waterproofing
You may need exterior waterproofing if you notice:
Water leaks or seepage in your basement
Foundation wall cracks
Damp or musty basement odors
Mold or efflorescence on foundation walls
Water pooling near the foundation after rain
Previous interior waterproofing that failed
If left untreated, water intrusion can cause serious structural damage and reduce your property value.
Site Inspection & Diagnosis
Identify water entry points and foundation conditions.
Our Exterior Waterproofing Process
We follow a proven, step-by-step process to ensure durable and code-compliant results:
Weeping Tile Drainage System Installation
Install or replace weeping tile to redirect groundwater.
Excavation to Footing Level
Carefully excavate to fully expose the foundation walls.
Foundation Insulation & Protection Board
Add insulation and protection layers for durability.
Exterior Waterproofing Membrane Application
Clean surfaces and repair cracks or defects.
Backfilling & Final Grading
Restore soil and ensure proper drainage away from the foundation.
Foundation Wall Preparation
Apply professional-grade rubberized waterproofing membranes.
Why Exterior Waterproofing Is the Best Solution
Stops water before it enters your basement
Long-term solution, not a temporary fix
Protects foundation structure from deterioration
Helps prevent mold and moisture damage
Increases property value
Reduces future repair costs
Exterior waterproofing is the gold standard for foundation protection.
Serving Toronto & the Greater Toronto Area
Exterior Waterproofing Cost in Toronto
The cost of exterior waterproofing in Toronto depends on several factors, including foundation depth, soil conditions, accessibility, and the scope of work required.
Average Exterior Waterproofing Costs
As a general guideline, exterior waterproofing costs typically range from:
$120 – $300 per linear foot
Factors That Affect the Price :
- Depth of excavation
- Foundation type (poured concrete, block, stone)
- Soil conditions and groundwater level
- Number of foundation walls
- Existing damage or required repairs
- Accessibility around the home
Every property is different, which is why an on-site inspection is essential for accurate pricing.
Areas We Serve – Exterior Waterproofing in Toronto & GTA
We proudly provide professional exterior waterproofing services across Toronto and the Greater Toronto Area, including:
Exterior Waterproofing in Toronto
Exterior Waterproofing in North York
Exterior Waterproofing in Scarborough
Exterior Waterproofing in Etobicoke
Exterior Waterproofing in East York
Exterior Waterproofing in Mississauga
Exterior Waterproofing in Vaughan
Exterior Waterproofing in Markham
Exterior Waterproofing in Richmond Hill
If you don’t see your city listed, contact us — we serve most locations across the GTA.
Is Exterior Waterproofing Worth the Cost?
Yes. Exterior waterproofing is a long-term investment that:
Prevents costly foundation repairs
Protects your basement from water damage
Reduces the risk of mold and moisture issues
Increases property value
Eliminates the need for repeated interior fixes
When installed correctly, exterior waterproofing can last 30+ years.
Get an Accurate Exterior Waterproofing Quote
The best way to determine the exact cost of exterior waterproofing for your home is through a professional on-site assessment.