Foundation Crack Repair London Ont.
A1 TripleSeal System™ — Permanent Crack Repair Done Right the First Time
We don’t just seal cracks — we repair, protect, and control water at the source using our proven TripleSeal System™ built for long-term performance.
INTERIOR CRACK REPAIR
Leaking foundation crack? Our A1 Triple Seal™ interior crack repair system permanently stops water intrusion from the inside. Fast turnaround, clean installation, and minimal disruption — keeping your basement protected and affordable to repair
Exterior Crack REpair
Protect your foundation with our proven exterior A1 Triple Seal™ crack repair system. Designed to stop active leaks at the source, reduce water pressure, and improve drainage, it delivers durable waterproofing protection built to last.
No Payment Until You’re Satisfied with the Work
Includes a 25-Year Transferable Warranty for reliable long-term protection.
Cracks in your foundation aren’t just cosmetic — they’re one of the most common causes of basement leaks and they only get worse.
At A1 Waterproofing, we don’t just seal the crack — we stop the problem at its source with professional Exterior and Interior waterproofing solutions designed to keep your foundation dry & protected for years to come!
Our Process
Our Interior Crack Repair Process
1. Fast Response
We respond quickly to urgent leak requests, with inspections typically scheduled within 48 hours.
2. Inspection & Estimate
After the inspection, you’ll receive a detailed inspection report along with a clear estimate outlining the recommended repairs and services.
3. Scheduling Your Repair
Once approved, we’ll schedule your repair at the earliest available convenience.
4. Clean & Professional Preparation
When we arrive, we take care to protect the work area and complete the repair with minimal disruption to your home.
5. A1 Triple Seal™ Crack Repair
Our proven A1 Triple Seal™ system includes:
- Applying a layer of epoxy cement over the crack
- Injecting the crack with polyurethane at multiple injection points to seal active leaks
- Installing a drainage board over the repair area as an added layer of long-term protection
6. Clean Finish
Once the repair is complete, we leave the work area clean and tidy with all tools and debris removed from the property.
7. Quick Turnaround
Most interior crack repairs are completed in approximately 1.5 to 3 hours depending on the size and condition of the crack.
fast & reliable service
We understand that water issues in your home require prompt attention. That’s why when it’s urgent, we’ll get a team member out to provide a quote within 48 hours or sooner.
Why Addressing Foundation Cracks Matters
Prevent Structural Damage
Cracks widen over time, leading to shifting walls and major foundation issues
Stop Active Leaks:
Cracks widen over time, leading to shifting walls and major foundation issues
Prevent Structural Damage
Cracks widen over time, leading to shifting walls and major foundation issues
Better Air Quality
Supports better indoor air quality by controlling moisture
lifetime warranty
All crack repairs are backed by a lifetime written warranty. If the leak returns we’ll fix it at no cost or fully refund your money.
Which Crack Repair Method Is Right for Your Home?
Exterior / Interior
Exterior Crack Repair
Exterior waterproofing is the most effective way to stop water before it ever reaches your foundation.
Our 3-part exterior crack repair system seals the crack, protects the wall, and keeps groundwater away—so water never reaches your basement.
Benefits:
Stops water at the source
Prevents concrete deterioration
Helps preserve structural integrity
No interior disruption
Long-lasting protection
- Lifetime Warranties
Interior Crack repair
When exterior access isn’t possible, interior crack repair offers an efficient and affordable way to stop water from entering your basement. These repairs seal the crack from the inside, stopping leaks and preventing further damage — fast, clean, and with no need for excavation.
Benefits:
Quick and cost-effective solution
Minimal disruption — no digging required
Seals cracks and stops active leaks
Prevents further wall deterioration
Ideal for finished basements or limited access areas
FOUNDATION CRACKS ONLY GET BIGGER
That tiny crack wont always be so tiny
Moisture, soil pressure, and seasonal temperature changes slowly force cracks to widen. What starts as a small line can quickly become a visible opening that allows water to enter. Addressing cracks early keeps repairs simple — and your basement dry.
Depending on the type and size of the crack, we choose the repair method that delivers the best, longest-lasting results.
This could include a polyurethane injection for active leaks, epoxy for solid structural bonding, carbon fiber reinforcement where extra support is needed, and specialized waterproofing materials designed specifically for either exterior or interior applications. Every repair uses a minimum of three layers of waterproofing, customized to your foundation and built to last a lifetime.
Over time, even minor cracks can expand and potentially lead to significant issues, including a compromise of structural integrity. It is essential to address all cracks that may be or are subject to moisture exposure immediately to prevent extensive damage.
We are A1 waterproofing
14 Years providing crack repair services
NO downpayments
Our commitment to providing A1 service is unparalleled. We prioritize your satisfaction above all else, guaranteeing that no payment will be required until you are satisfied with the work completed. And if that’s not convincing enough, rest assured that we will happily refund your money if we are unable to resolve the issue.
commercial grade Products
The products we utilize are designed for commercial use, featuring warranties that far surpass what is typically available in residential offerings.
providing:
Quick Response measures
Unforeseen crack repairs can disrupt renovation projects. Therefore, we prioritize efficiency & quick response measures to ensure your repairs are completed promptly when urgent.
unmatched:
Customer service
From the time you call to book an estimate to the completion of your project you will be in good hands with A1’s friendly and professional service.
Crack repairs we offer
Exterior Crack Repairs
Exterior crack repair is the most durable, long-term solution — a full three-part waterproofing system that prevents water from ever reaching your foundation
Interior Crack Repairs
Interior crack repair offers a fast, permanent solution to leaking foundation cracks — no excavation required, no mess, just lasting protection.
POLYURETHANE INJECTIONS
Polyurethane crack injection seals leaks deep within the wall. When combined with our waterproofing system, it becomes a permanent, watertight repair
CARBON FIBRE CRACK REPAIRS
High-strength carbon fibre reinforcement that stabilizes cracked foundation walls and prevents future movement — fast, clean, and permanent.
3 Common Foundation Cracks Explained
Diagonal Cracks
Diagonal cracks run along your foundation or basement wall at a 30-75 degree angle. This type of crack may be a thin hairline crack, but will likely be wider at one end than the other. Diagonal foundation cracks are caused by differential settling of a foundation, which is where one side of a home’s foundation settles lower than the rest of the foundation. This type of uneven tension then causes diagonal cracking.
Vertical Cracks
These are the most common cracks — straight up and down or nearly so. They’re often caused by settling or concrete shrinkage as it cures. While typically non-structural, they can allow water infiltration if left unsealed. Monitoring and sealing early on keeps them from growing or causing moisture problems.
Horizontal Cracks
This is the most serious class. When cracks run horizontally across a foundation wall, it often signals that soil pressure is pushing inward and the structural integrity of the wall is compromised. These must be addressed promptly with specialized solutions to restore stability and prevent collapse.
