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Exterior Basement Waterproofing in Montreal
Exterior basement waterproofing is the most effective and long-lasting method to protect your home against water damage. With Montreal’s harsh climate — heavy snow, rain, and constant freeze-thaw cycles — exterior waterproofing is essential for keeping foundations strong and basements dry.
At Tross Construction, we provide professional exterior basement waterproofing services designed to stop water before it even reaches your foundation. This comprehensive system protects your home from leaks, cracks, mold, and structural deterioration.
Why Exterior Waterproofing Is the Best Protection for Your Home
Interior waterproofing handles water after it enters.
Exterior waterproofing stops water before it ever touches your foundation.
Benefits of Exterior Basement Waterproofing
Prevents water infiltration at the source
Protects your foundation walls from moisture
Reduces soil pressure and hydrostatic pressure
Extends your home’s lifespan
Prevents mold, humidity, and structural damage
Provides long-term waterproofing (often 20–30 years or more)
It is the gold-standard waterproofing system for Montreal homes.
Complete Exterior Waterproofing Services
Our team handles every step of the waterproofing process from outside your home, ensuring full, reliable protection.
Full-Perimeter Excavation
We excavate around your foundation down to the footing level to expose all exterior walls. This allows us to clean, inspect, and prepare the foundation for waterproofing.
Foundation Cleaning & Crack Inspection
We clean the walls to remove dirt, debris, and old coatings.
Then we inspect the foundation for cracks and weak points.
Foundation Crack Repair
Any cracks found are repaired using:
Exterior hydraulic cement
Polyurethane or epoxy injection
Exterior membrane sealing
This ensures leaks are stopped permanently.
Waterproof Membrane Installation
A thick, high-performance waterproof membrane is applied to the exterior wall.
This creates a strong, flexible barrier against moisture.
We use professional-grade membranes such as:
Elastomeric coatings
Rubberized membranes
Bitumen-based coatings
Drainage Board Installation
Drainage panels protect the membrane and allow water to flow downward efficiently.
Benefits include:
Added insulation
Root protection
Improved drainage
Increased waterproofing lifespan
Exterior Weeping Tile / French Drain System
At the bottom of the foundation, we install a perforated drain pipe surrounded by gravel.
This redirects groundwater away from your foundation.
Gravel Backfill & Soil Replacement
We backfill using gravel and topsoil to improve drainage and reduce pressure on the foundation.
Signs You Need Exterior Waterproofing
Exterior waterproofing is recommended when:
Structural Warning Signs
Deep cracks in foundation walls
Bowing or bulging walls
Crumbling foundation concrete
Signs You Need Exterior Waterproofing
Water Intrusion Symptoms
Water leaking during rain
Wet basement walls
Mold or mildew smell
Puddles near the foundation
Moist spots at the bottom of walls
Drainage & Soil Problems
Poor grading
Soil erosion
Standing water around the home
Montreal’s older homes are especially vulnerable — many were built before modern waterproofing standards.
Our Exterior Basement Waterproofing Process
1. Site Assessment & Waterproofing Plan
We inspect your property, review drainage patterns, and determine the ideal waterproofing method.
2. Full-Perimeter Excavation
We carefully excavate the foundation using skilled operators and modern equipment.
3. Foundation Cleaning & Repair
Walls are cleaned, cracks repaired, and weak points sealed.
4. Application of Waterproof Membrane
We install a thick, durable membrane designed to block moisture penetration.
5. Drainage Board Installation
A drainage mat is added for improved water flow and protection.
6. Installation of Weeping Tile (French Drain)
A new perforated drain pipe is installed to channel water away from the foundation.
7. Backfilling & Soil Grading
We backfill with gravel for drainage, followed by soil for stability and landscaping.
8. Final Inspection
We check the entire waterproofing system to ensure long-term protection.
Why Choose Tross Construction for Exterior Waterproofing?
Waterproofing Experts
We specialise in exterior waterproofing designed specifically for Montreal’s climate.
High-Quality Materials
We use only professional-grade membranes, drainage boards, and drain systems.
Long-Term Protection
Exterior waterproofing typically lasts decades with minimal maintenance.
Skilled Excavation Team
We handle excavation safely, even in tight or residential spaces.
Transparent Pricing
You receive a clear estimate before work begins — no surprises.
Clean & Respectful Worksites
We protect landscaping, maintain safety barriers, and clean up thoroughly.
Additional Exterior Waterproofing Services
Weeping Tile Replacement
Old clay or clogged drains can cause serious foundation issues — we replace them with modern systems.
Exterior Crack Injection
Repairing cracks from the outside ensures a long-lasting seal.
Basement Window Well Installation
Improves drainage and prevents flooding around basement windows.
Exterior Wall Insulation
Add insulation panels to improve energy efficiency.
Frequently Asked Questions
Most projects take 3–10 days, depending on the size of the foundation.
Exterior work should ideally be done in spring, summer, or early fall due to frozen ground.
A properly installed system can last 20–30 years or more.
Yes — we offer warranty options depending on the products and systems used.
We work carefully to minimise disruptions and restore affected areas.
Protect Your Home with Exterior Waterproofing
Exterior basement waterproofing is the ultimate way to prevent leaks, mold, and structural damage. With Tross Construction, you get a professional team dedicated to protecting your home with industry-leading waterproofing systems.
Contact us for a free exterior waterproofing estimate
Proudly serving Montreal and surrounding regions
Strength you can see. Quality you can trust.
Licence RBQ #5841923501
Tross Construction Inc. is a company specializing in interior and exterior renovation projects, masonry, concrete and everything related to finishing work.
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