Ontario's Trusted Waterproofing & Restoration Experts
IICRC certified specialists protecting Ontario homes from top to bottom — basement waterproofing, foundation crack repair, roof leaks, sump pumps, and full damage restoration. Backed by a Lifetime Limited Warranty.
Complete Waterproofing Solutions
Waterproofing is the foundation of everything we do. From basement waterproofing and foundation crack repair to sump pumps, weeping tile, and roof leaks — we protect Ontario homes from water intrusion at every point of entry. All qualified work is backed by our Lifetime Limited Warranty.
Basement Waterproofing
Interior & exterior solutions
A wet basement is one of the most common — and costly — problems for Ontario homeowners. We offer both interior and exterior basement waterproofing systems tailored to your home's specific needs. Interior solutions include drainage channels, sump pits, and vapor barriers. Exterior solutions involve excavation, waterproof membrane application, and drainage board installation to stop water before it enters.
- Interior drainage systems
- Exterior membrane waterproofing
- Vapor barrier installation
- Crawl space encapsulation
Foundation Crack Repair & Injection
Polyurethane & epoxy injection
Foundation cracks are the most direct path for water to enter your home. Left untreated, they widen with Ontario's freeze-thaw cycles and can compromise your home's structural integrity. We use professional-grade polyurethane foam injection for active leaks and epoxy injection for structural cracks — providing a permanent, flexible seal that moves with your foundation.
- Polyurethane foam injection
- Epoxy structural crack repair
- Interior & exterior crack sealing
- Lifetime warranty on qualified repairs
Weeping Tile & French Drain
Interior & exterior drainage systems
Weeping tile (also called a French drain or perimeter drain) is the backbone of a complete waterproofing system. Old or collapsed weeping tile is a leading cause of chronic wet basements in Ontario homes. We install new interior and exterior weeping tile systems with proper gravel beds and drainage outlets, redirecting groundwater away from your foundation before it can cause damage.
- Interior perimeter drain installation
- Exterior weeping tile replacement
- Gravel bed and filter sock
- Connection to sump pit or storm drain
Sump Pump Installation & Service
Primary, backup & battery systems
A properly installed and maintained sump pump is your last line of defence against basement flooding. We install primary sump pumps, battery backup systems (critical during power outages in storms), and water-powered backup pumps. We also service and replace existing pumps, clean sump pits, and install alarm systems to alert you if water levels rise.
- Primary sump pump installation
- Battery backup sump systems
- Annual maintenance & inspection
- Alarm and monitoring systems
Window Well Waterproofing
Sealing, covers & drainage
Window wells that fill with water are a major source of basement flooding and window seal failure. We install proper window well covers to prevent rain and debris accumulation, add drainage gravel and drain pipes to redirect water away, and apply professional sealants around the window frame and well perimeter to eliminate infiltration points.
- Window well cover installation
- Drainage gravel and drain pipe
- Frame and perimeter sealing
- Window well liner replacement
Roof Leak Repair
Shingle & flat roof specialists
Roof leaks are deceptive — water can travel far from the entry point before becoming visible inside. We repair leaks on both sloped shingle roofs and flat membrane roofs. Our work includes flashing repair and replacement, shingle repair, valley sealing, chimney and skylight caulking, and flat roof membrane patching. We identify the true source of the leak, not just the symptom.
- Shingle repair & replacement
- Flat roof membrane patching
- Flashing & valley repair
- Chimney & skylight sealing
Exterior Grading & Drainage
Slope correction & surface drainage
Improper grading — where the ground slopes toward your foundation instead of away — is responsible for a significant portion of wet basement problems. We correct negative grading by adding and compacting soil to create proper slope away from your foundation. We also install surface drainage channels, downspout extensions, and splash pads to manage roof runoff effectively.
- Negative grading correction
- Soil grading & compaction
- Downspout extension & splash pads
- Surface drainage channels
Crawl Space Encapsulation
Moisture barrier & insulation
An unprotected crawl space is a major source of moisture, mold, and energy loss in Ontario homes. Crawl space encapsulation involves installing a heavy-duty vapor barrier on the floor and walls, sealing vents, and often adding a dehumidifier to maintain dry conditions year-round. This protects floor joists from rot, improves indoor air quality, and increases energy efficiency.
- Heavy-duty vapor barrier installation
- Vent sealing & insulation
- Dehumidifier installation
- Joist and structural protection
Not Sure Which Solution You Need?
We offer free, no-obligation on-site assessments across Ontario. Our IICRC certified technicians will diagnose the issue and recommend the most cost-effective solution — in writing, before any work begins.
IICRC Certified Damage Restoration
When damage has already occurred, our IICRC certified technicians respond fast to restore your property to pre-loss condition. We handle water, fire, mold, storm, and odor damage — with thorough documentation to support your insurance claim.
Water Damage Restoration
IICRC S500 StandardWhen water damage occurs — from flooding, burst pipes, or appliance failures — rapid response is critical. Our IICRC-certified technicians follow the S500 Standard for Professional Water Damage Restoration, deploying industrial air movers and dehumidifiers to fully dry your property and prevent secondary mold growth.
Fire & Smoke Damage Restoration
IICRC S700 StandardFire damage extends far beyond charred surfaces. Smoke and soot penetrate walls, HVAC systems, and belongings throughout your home. We perform thorough structural cleaning, content restoration, and permanent odor neutralization using thermal fogging and hydroxyl generators.
Mold Removal & Remediation
IICRC S520 StandardMold can begin growing within 24–48 hours of water exposure and poses serious health risks. We establish proper containment, use HEPA-filtered air scrubbers, and follow IICRC S520 protocols for safe, thorough mold remediation. We also address the underlying moisture source to prevent recurrence.
Wind & Storm Damage
Emergency board-up & restorationOntario storms can cause rapid structural damage. We provide same-day emergency board-up and tarping to prevent further damage, followed by a comprehensive structural assessment and full restoration — from roof repairs to interior drying and reconstruction.
Odor Removal
Hydroxyl & ozone treatmentPersistent odors from fire, mold, sewage, or pets require professional treatment — not surface cleaning. We use hydroxyl generators and ozone treatment to permanently neutralize odor molecules at the molecular level, providing lasting results safe for residential use.
Ontario's Waterproofing Specialists — IICRC Certified for Complete Restoration
Top to Bottom Seal was built on a foundation of waterproofing expertise. We protect Ontario homes from water intrusion at every entry point — basement walls, foundation cracks, weeping tile, sump pumps, window wells, and roofs. Waterproofing is our core craft, and we've spent years perfecting it.
As our clients' needs grew, so did our capabilities. We expanded into full-service damage restoration — earning IICRC certifications in water damage restoration, mold remediation, and fire & smoke restoration. The IICRC (Institute of Inspection, Cleaning and Restoration Certification) is the globally recognized gold standard, and our certifications mean every restoration job meets the highest professional protocols.
We are licensed, fully insured, and proud to stand behind every job with our Lifetime Limited Warranty on qualified waterproofing work. Whether you're planning preventative waterproofing or dealing with an emergency at 2am, we're here to help — from top to bottom.
Serving London & Southwestern Ontario
Our Qualifications & Commitments
- IICRC Certified Technician (Water Damage Restoration)
- IICRC Certified Technician (Fire & Smoke Restoration)
- IICRC Certified Technician (Mold Remediation)
- Licensed & Fully Insured — Ontario
- Lifetime Limited Warranty on Qualified Work
- 24/7 Emergency Response Available
Business Hours
Our Process — Waterproofing & Restoration
Whether you're booking a waterproofing assessment or responding to an emergency, we follow the same clear, proven process on every job — from the moment you call to the final walkthrough. No surprises, no shortcuts.
Call Us — We Respond Fast
Contact us 24/7 at 519-615-2900. For emergencies, we aim to be on-site within hours. We'll ask a few questions to understand the situation and dispatch the right equipment immediately. Time is critical — water damage can cause mold growth within 24–48 hours.
Thorough Assessment & Documentation
Our IICRC certified technician performs a comprehensive assessment using moisture meters, thermal imaging, and air quality testing. We document all damage thoroughly — essential for insurance claims. You receive a clear, honest report of what needs to be done and why.
Professional Restoration Work
We execute the restoration plan using industrial-grade equipment and IICRC-standard protocols. This includes water extraction, structural drying, mold remediation, smoke/soot removal, odor neutralization, or waterproofing — depending on your needs. We keep you informed throughout.
Final Inspection & Warranty
We conduct a final walkthrough with you to confirm the work meets our standards and your expectations. All qualified restoration and waterproofing work is backed by our Lifetime Limited Warranty. We also provide recommendations to prevent future damage.
What Our Clients Say
Real reviews from Ontario homeowners who trusted us with their most important investment — their home.
"After years of dealing with water seeping through our foundation, we called Top to Bottom Seal. They identified the issues quickly and provided a permanent solution. Their warranty gives us peace of mind, and our basement has remained completely dry ever since. Best investment we've made in our home."
"Had a significant crack in my foundation that was letting water in every spring. Top to Bottom Seal came out, assessed it properly, and did a polyurethane injection repair. That was two years ago and it's been bone dry through two spring thaws. Professional, punctual, and the price was fair."
"Our old weeping tile had completely collapsed. Top to Bottom Seal installed a full interior drainage system with a new sump pump and battery backup. The work was clean, the crew was respectful of our home, and they explained everything clearly. No more wet basement — period."
"Had a flat roof that was leaking into our upstairs bedroom. They found the actual source of the leak — not just the symptom — and patched it properly. No more water stains after the last three rainstorms. Quick to respond, honest about what needed to be done, and didn't oversell."
"Burst pipe flooded our basement on a Sunday night. Top to Bottom Seal was there within two hours. They extracted the water, set up industrial dryers, and had everything dry within days. The IICRC certification gave us confidence they knew exactly what they were doing. Insurance claim was smooth with their documentation."
"We discovered mold in our basement after a slow leak. The team was thorough, professional, and explained every step of the remediation process. They used proper containment and HEPA equipment. The air quality is noticeably better and we haven't had any recurrence. They also fixed the moisture source so it won't come back."
Homeowner Resources
Practical guides and expert advice for London and Southwestern Ontario homeowners on waterproofing, restoration, and protecting your home.
March 10, 2026
7 Warning Signs Your Basement Needs Waterproofing in London, Ontario
London, Ontario's clay-heavy soil and freeze-thaw cycles create unique challenges for basement foundations. Here are the 7 warning signs every homeowner should know — and why acting early saves thousands.
March 5, 2026
What to Do in the First 24 Hours After Water Damage in Your Home
The first 24 hours after water damage are the most critical. Acting quickly and correctly can mean the difference between a manageable repair and a complete gut renovation. Here's exactly what to do.
February 28, 2026
Mold in Your Home: A Complete Guide for Ontario Homeowners
Mold is one of the most misunderstood and mishandled problems in Ontario homes. This complete guide covers identification, health risks, professional remediation, and prevention — everything you need to know.
February 20, 2026
Weeping Tile & Sump Pump Systems: A London Homeowner's Complete Guide
Weeping tile and sump pump systems are the backbone of basement waterproofing in Ontario. Here's everything London homeowners need to know about how they work, when they fail, and what to do about it.
Common Questions
Questions about waterproofing, restoration, or our process? We've answered the most common ones below. For anything else, call us directly.
Request a Free Quote
Fill out the form below and we'll respond within 24 hours. For emergencies, call us directly at 519-615-2900.
Top to Bottom Seal
592 Adelaide St N, London, ON N6B 3J8
★★★★★ IICRC Certified · Serving Southwestern Ontario
Find Us & Our Service Area
Based in London, ON — we serve all of Southwestern Ontario within approximately a 2-hour radius, including Windsor, Sarnia, Kitchener, Hamilton, and everywhere in between.
Proudly serving London, Woodstock, Stratford, St. Thomas, Sarnia, Windsor, Chatham, Kitchener, Cambridge, Brantford, Hamilton & all of Southwestern Ontario.