Exterior Waterproofing Services in Toronto & GTA
Protect Your Foundation From the Outsude - Permanetly
When it comes to serious basement leaks or foundation issues, exterior waterproofing is the gold standard. At DrainPro Plumbing & Drain Services Inc., we specialize in full-depth exterior waterproofing that stops water at the source before it ever enters your home. Serving Toronto, Mississauga, Vaughan, Richmond Hill, Brampton, Markham, Pickering, Etobicoke, North York, and the entire GTA, we provide clean, code-compliant waterproofing solutions that protect your biggest investment your home.
24/7 Emergency Service
Fully Licensed & Insured
Guaranteed Satisfaction
Rated 5 Stars by Homeowners
What Is Exterior Waterproofing?
Exterior waterproofing involves excavating around your foundation, applying waterproof membranes and drainage systems, and fully sealing the structure from the outside. This method prevents groundwater and rain runoff from entering your basement walls, keeping the interior dry and mold-free.
It's the most permanent, long-term solution for homes with recurring leaks, wet basement walls, or failed drainage systems, especially in older GTA homes with clay weeping tiles or cracked concrete foundations.
When Do You Need Exterior Waterproofing?
You have visible water running down basement walls
Your weeping tile system is missing, collapsed, or blocked
You’ve already tried interior waterproofing and still have leaks
You see cracks, bowing, or water stains on the foundation
Your sump pump runs constantly and can't keep up
You're in an area with a high water table or poor grading
Our Exterior Waterproofing Process
At DrainPro, every job starts with a foundation inspection and clear quote. Here's what our standard exterior waterproofing job includes
1. Excavation to Footing Depth
We dig alongside the foundation wall to expose the area for repair.
4. Dimple Board Installation
A drainage mat is installed over the membrane to protect it and redirect water to the new drainage system.
7. Backfill & Cleanup
We backfill with clean gravel and soil, compact carefully, and restore the landscaping to original condition.
2. Foundation Wall Cleaning & Crack Repair
We wire-brush the wall and seal cracks with hydraulic cement or injection foam.
5. Weeping Tile Replacement
We install modern perforated drainage pipe surrounded by gravel and filter fabric to prevent clogging.
3. Waterproof Membrane Application
We apply a heavy-duty elastomeric membrane or peel-and-stick membrane to fully seal the wall.
6. Window Well Installation (if needed)
New window wells and vertical drains are installed for basement windows below grade.
Every step is done by our in-house team of licensed waterproofing specialists, not subcontractors.
Why Choose DrainPro?
At DrainPro, we bring a reputation built on trust, efficiency, and long-lasting results.
Here’s why homeowners across Toronto, Mississauga, Vaughan, and the entire GTA rely on our drain expertise
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Customer Reviews
Jason M. – North York, ON
"I had water coming in through my block foundation on one wall. Oleksandr showed me how the old clay drainage was no longer working. They dug out the entire wall, replaced the weeping tile, and sealed the foundation properly. The yard was cleaned up better than I expected and I got to see the photos of the work before it was backfilled. It's been 9 months with zero leaks. Very happy."
Shannon R. – Vaughan, ON
"Mike and his crew did a full exterior waterproofing around the back of our house. They were on time, polite, and very clean. They removed the old concrete walkway, did the excavation, replaced everything, and re-poured the concrete after. I appreciated the clear breakdown of the quote and the professionalism throughout."
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What is a backwater valve and how does it work?A backwater valve is a plumbing device installed on your main sewer line to prevent sewage from backing up into your home. During heavy rainfall or sewer overload, the valve flap automatically closes to stop water and sewage from flowing backward into your basement. It’s one of the most effective ways to prevent basement flooding in Toronto and the GTA.
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Do I really need a backwater valve in Toronto?Yes if your home has a basement and is connected to the city’s sewer system, you are at risk during heavy storms. The City of Toronto recommends backwater valves to protect your home from sewage backups and even offers a subsidy program to help cover installation costs.
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How much does a backwater valve installation cost?The cost typically ranges from $1,500 to $3,500, depending on your home's plumbing system, accessibility, and permit requirements. The City of Toronto’s Basement Flooding Protection Subsidy Program offers homeowners up to $1,250 back to help offset the cost.
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How long does the installation take?In most cases, backwater valve installation takes one day. Our DrainPro team handles everything from initial inspection to concrete restoration, ensuring a smooth and efficient process with minimal disruption to your home.
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Is a permit required for backwater valve installation?Yes most municipalities, including Toronto, require a plumbing permit before installation. Don’t worry DrainPro takes care of the entire permit process for you, ensuring everything is up to code and subsidy-compliant.
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How do I maintain a backwater valve?You should inspect your backwater valve every 6 months. Open the clear cover and check for debris, wear on the rubber seal, and proper flap movement. DrainPro will show you how to do this during installation and offers maintenance services if needed.
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Will a backwater valve stop all types of basement flooding?A backwater valve protects against sewage backups from city sewer lines. To protect against groundwater or stormwater flooding, you may also need a sump pump or weeping tile system. We offer full basement waterproofing solutions ask us about your options.
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Can I get help applying for the city rebate program?Absolutely. Our team will guide you through the City Basement Flooding Protection Subsidy Program and assist with all necessary paperwork to help you get your rebate quickly and easily.
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How do I book a free quote for backwater valve installation?You can call us at (647) 867-9779 or fill out our online quote form. One of our licensed technicians will visit your home, inspect your system, and provide a detailed estimate with no pressure.
Don’t wait for leaks to get worse. Whether you’re dealing with water in the basement or planning a renovation, DrainPro will inspect, quote, and protect your foundation the right way.