Basement and Foundation Waterproofing in Markham
Made for Rouge River valleys, new subdivisions, and clay soil
From Unionville and Markham Village to Cornell and Berczy Village, basements here see clay that holds water, quick summer storms, and tight side yards. We match the fix to your home. Exterior membrane with dimple board and new weeping tile. Or an interior drain channel to a sealed sump when digging outside is not the right choice. You get a clear plan, a firm price, photo updates, and a 5 Year Workmanship Warranty.
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Markham Basement Waterproofing and Leak Repair
Lots near the Rouge River, Little Rouge, and German Mills Creek can push water toward the footing. Older streets may still have clay weepers that are clogged or broken. Newer builds can settle and trap water at the wall or cold room. We start with a camera and moisture check. Then we install the right repair. Exterior membrane with dimple board and a new footing drain. Or an interior drain to a sealed sump with optional battery backup. We also do epoxy or urethane crack injection and backwater valves for heavy rain.
Early signs in Markham include white salt on walls, a damp line where the floor meets the wall, window wells that hold water, soft trim at the base, or a pump that runs for hours.
Our Waterproofing Services in Markham
Clean installs for valley, infill, and subdivision lots
We install exterior and interior systems the right way. We control dust, protect landscaping, keep trenches tidy, and provide photo proof. Eligible work includes a 5 Year Workmanship Warranty.
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How We Waterproof Markham Basements
Inspect then plan then install exterior or interior then photo proof then warranty
Locate & Excavate
Footing Drainage (Weeping Tile)
New perforated weeping tile is set at the footing, wrapped in filter fabric and gravel, and tied to a safe discharge or sump—relieving hydrostatic pressure that forces water through weak points.
We identify where water is entering, then safely excavate along the affected wall down to the footing, keeping the trench neat and protected. Toronto’s freeze-thaw and clay-rich soils can drive leaks, so exposing the problem area lets us treat it properly.
Waterproof the Wall
The foundation is cleaned and primed, then coated with a rubberized waterproofing membrane and covered with dimple drainage board to direct water away from the wall
Backfill, Grade & Verify
We backfill in layers, restore grading away from the house, then perform a function/flow check and review photos with you. Where needed, we recommend a sump pump for extra protection and leave you with our 5-Year Workmanship Warranty.
How we plan the right waterproofing in Markham
Every house and lot is different. We look at soil, grading, side yard access, downspout paths, and where water shows up. In Markham that often means clay and fast storms near the Rouge. We take photos and explain options. If we can dig safely outside, we stop water before it reaches the wall. We add a rubber membrane, dimple board, and new weeping tile at the footing. We protect plants, backfill in layers, and regrade the soil to slope away. If digging is not practical, we install an interior drain channel that sends water to a sealed sump pump. For single cracks we use epoxy or urethane injection. If window wells are part of the issue, we add a drain and clean gravel. You get a clear plan for your Markham home.
Basement Leak Issues We See Around Markham
Upgrades that add strong protection in Markham
Sump system and backup
A sealed lid, a quiet check valve, and a battery backup help the pump work during storms and power cuts. We size the pump, test the float, and set the discharge so water moves away from the wall.
Downspouts and grading
Extend downspouts so water ends at least two meters from the house and make sure soil slopes away. This lowers pressure at the footing and protects the weeping tile in Markham clay.
Window wells and cold rooms
Add clean gravel and a drain in each window well so it empties fast. Seal the cold room slab edge and tie drains into the weeper or sump. These small changes prevent leaks in common Markham layouts.
Why Markham Homeowners Choose DrainPro
Local crew with clear quotes and clean work. We install exterior and interior systems, show photo proof, and back our work with a 5 Year Workmanship Warranty.
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Areas We Serve in Markham
We work across Markham and tailor systems to lot lines, soil, and house age. We keep sites clean, provide photo proof, and include a 5 Year Workmanship Warranty on eligible work.
Related Services in Markham
Protect your home end to end with coordinated drain and plumbing work
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Customer Reviews
Local results you can count on
Markham homeowners choose us for clear plans, tidy work, and dry basements
Frequently Asked Questions
Do not wait for the next storm. Book a Markham waterproofing inspection today. You will get a clear plan, a firm price, and photo proof of the work.