Basement Waterproofing Services in Southern Ontario

Basement Waterproofing, Leak Repair & Flood Protection in Southern Ontario. Preventative Maintenance & Emergency Ready.

Exterior Cracks? Water in Your Basement? Damp/Moist Smell?

Finding water in your basement or crawlspace is never a good sign… Luckily, we are here to help solve basement flooding, hydrostatic pressure and leak issues once and for all with our expert basement waterproofing services.

There are many issues that could lead to a wet basement in Southern Ontario. We work to isolate and solve your issues with our professional basement waterproofing process. We will repair leaks, prepare a new waterproof membrane, check your sump pump and make sure you are protected.

If you are repairing an old structure, building a new one, or are facing an emergency basement flood – Our team will provide the waterproofing solution in a timely manner with top quality workmanship. Trust JR’s to the task!

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Basement Waterproofing Checklist

Whether you are seeking preventative basement waterproofing protection or are facing an active basement flooding emergency, contact us immediately. We serve a large area across southern Ontario, from London to Delhi, and Port Rowan to Cambridge and everywhere in between.

✅ Exterior Waterproofing

Excavating around the foundation to apply a waterproof membrane and address water before it ever reaches the wall — the most comprehensive long-term solution for a wet basement.

✅ Waterproof Membranes

A high-quality waterproof membrane applied to the exterior foundation wall creates a durable barrier against groundwater infiltration and hydrostatic pressure.

✅ Crack Repairs

Foundation cracks — whether hairline or structural — are sealed or excavated depending on severity, stopping active leaks and preventing further water intrusion.

✅ Basement Leak Repairs

Whether water is seeping through the floor, walls, or joints, we locate the source and apply the right repair method to stop the leak properly rather than just manage it.

✅ Interior Water Control System

For basements where exterior excavation isn’t feasible, an interior drainage system channels water that enters the foundation to a sump pit before it can cause damage.

✅ Sump Pumps & Pits

A properly sized and installed sump pump is your last line of defence against basement flooding — we install, replace, and service pumps to keep your system running when it matters most.

✅ Battery Back-Up Systems

Power outages happen most often during the same storms that overwhelm drainage systems — a battery back-up ensures your sump pump keeps running even when the grid goes down.

✅ Window Wells

Improperly drained window wells are a common and overlooked source of basement water entry — we install and repair window wells to keep water moving away from the foundation opening.

✅ Drainage Riser Installation

Drainage risers provide accessible cleanout points for weeping tile systems, making future maintenance and inspections straightforward without requiring excavation.

✅ Crawlspace Inspection

Crawlspaces are prone to moisture buildup, efflorescence, and early-stage structural issues that go unnoticed — a proper inspection identifies problems before they escalate.

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Basement Waterproofing FAQ

What causes basement flooding in Southern Ontario?

Most wet basements in Southern Ontario come down to a few common issues: hydrostatic pressure from a high water table, foundation cracks that allow groundwater in, failed or missing weeping tile, poor grading around the home, or overwhelmed sump systems during heavy rain or spring thaw. Older homes in areas like Hamilton, Brantford, and London are especially prone because of aging foundation materials and original drainage systems that have deteriorated over decades.

Exterior waterproofing involves excavating around the foundation to apply a waterproof membrane and replace or install weeping tile at the footing level. It addresses water before it reaches the foundation wall. Interior waterproofing manages water that’s already entering — typically through an interior water control system, sump pump, and drainage channels along the basement floor. JR’s Waterproofing assesses the source of the problem first and recommends whichever approach actually solves it, or a combination of both when the situation calls for it.

It depends on the crack. Minor hairline cracks in poured concrete can sometimes be sealed from the inside using injection methods. But if the crack is actively leaking, widening, or tied to structural movement, exterior excavation is usually the right call. JR’s Waterproofing inspects the crack, the wall type, and the soil and drainage conditions around the home before recommending a repair method.

If your basement has any history of water intrusion — even dampness or a musty smell — a sump pump is likely part of the solution. A battery back-up system is an added layer of protection for when the power goes out during storms, which is exactly when water problems tend to get worse. Homes in lower-lying areas across Southern Ontario, particularly near rivers or in older neighbourhoods with clay-heavy soil, benefit most from having both in place.

Yes. JR’s Waterproofing and Structural Repairs responds to emergency basement flooding situations across their Southern Ontario service area, from London to Cambridge and Hamilton to Norfolk County. If you’re dealing with active water in your basement, contact the team directly at 226-970-3100 to arrange an immediate assessment.

Timelines vary by the scope of work. A single-wall exterior waterproofing job might take two to three days, while a full perimeter job takes longer. Exterior work does require excavation along the foundation, which temporarily disrupts landscaping adjacent to the house. JR’s team backfills and restores the area once the waterproofing and drainage work is complete. Interior systems are generally less disruptive and faster to install.

Managing water — with dehumidifiers, towels, or hoping it dries out — doesn’t address the cause and often leads to mould, wood rot, and long-term structural damage. Waterproofing an older home protects the foundation, the livability of the space, and the value of the property. Many older homes in Southern Ontario were built with stone or block foundations that are more porous than modern poured concrete, which makes proper waterproofing even more important, not less.

Gallery of Waterproofing in Action

Basement waterproofing issues can start outside with grading, drainage, or pressure against the foundation, while the signs often show up inside as cracks, dampness, staining, or water along the floor. These photos show both sides of the problem and the work involved in fixing it properly.

Our Basement Waterproofing Service Area

JR’s Waterproofing & Structural Repairs provides basement waterproofing, foundation crack repair, and sump pump installation across Southern Ontario. Our crews work daily throughout the following areas:

JR's Waterproofing and Structural Repair Service Area on a Map
JR Waterproofing Structural Repair Ontario

Contact JR's Today

Seeing signs of water in your basement? Contact JR’s Waterproofing and Structural Repairs to get the issue assessed and the right solution in place before it turns into a bigger problem.

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Eric Smethurst JR's