Interior basement waterproofing installs an unseen drainage network beneath your concrete slab to capture groundwater before it can damage walls or floors. Rather than digging around your foundation, we cut a slim trench along the perimeter, add weeping tile, seal wall leaks, and tie everything into a sump pump. As hydrostatic pressure builds, water flows into the tile, collects in the sump basin, and is pumped safely away—ensuring a dry, usable basement, even in Welland’s soggiest conditions.
Weeping tile (a.k.a. perimeter drain or French drain) uses perforated pipe wrapped in filter fabric and surrounded by gravel at the footing level. Benefits include:
● Pressure Relief :Channels moisture into your sump basin.
● Finish Protection: Stops efflorescence, mold, and warping on walls and floors..
● Protects Finishes: Stops water stains, mold, and rot on walls and floors.
● Foundation Longevity: Reduces soil erosion around footings.
Be on the lookout for:
Spotting any of these means it’s time for a free inspection Welland from our experts.
With more than 45 years in the industry, we bring unmatched expertise, hands-on knowledge, and proven reliability to every job.
Google-Guaranteed professionals meeting Ontario standards.
We’ve successfully completed over 3,500 drainage and waterproofing projects across the region—earning the trust of homeowners and businesses alike.
25-year weeping tile; 5-year on pumps and labor.
Detailed written estimates with no hidden fees.
Rapid flood cleanup and system repair.
A century-old home near Cooks Mills suffered seasonal flooding through block walls. Our solution:
Result: Two successive rainy seasons with zero water intrusion—homeowner peace of mind restored.
Welland’s unique conditions make basements vulnerable:
Book a waterproofing system check Welland each spring.
Run your sump pump monthly to confirm operation
Avoid damage to floors, walls, and personal belongings.
Avoid letting debris or sediment enter floor drains.
Inspect your interior wall membrane for wear or cracking.
Services Offered
Phone Number
Email Address
Call (905) 431-5612 now to schedule your interior waterproofing consultation Welland—emergency flood response available 24/7.
Being a homeowner is one of the most rewarding commitments you can make. Creating stability, the sense of accomplishment, and
A crack in your foundation can be either a small waterproofing issue… or the first warning sign of structural movement.
A basement should feel like a calm part of the house — a place you don’t have to think about
Plumbing problems usually don’t start with a big splash. They begin in small ways — a tap that won’t stop
Sometimes your bathtub just decides it won’t drain. No warning, no reason… it just sits there with water like it
Properly functioning drains are barely noticed when they are functioning correctly. But when something goes wrong it can be disorganizing
USP |
Details |
|---|---|
| 45+ Years of Proven Industry Experience | McDowell Drain & Waterproofing has been protecting homes for over four decades—experience that cannot be replicated. |
| 20-Year Written Warranty on Waterproofing Systems | Long-term protection backed by a 20-year warranty, not short-term promises. |
| 3,500+ Successfully Completed Projects | Thousands of waterproofing and drainage projects completed across residential properties. |
| Niagara Region Specialists | Deep expertise in local soil conditions, water tables, and aging infrastructure unique to the Niagara Region. |
| Complete Drainage & Waterproofing Solutions | Interior waterproofing, exterior waterproofing, drain repair, sump pumps, backwater valves—handled by one expert team. |
| Permanent Fixes, Not Temporary Repairs | Root-cause solutions that stop water problems permanently, not seasonal patchwork. |
| Honest Diagnostics & Clear Explanations | Homeowners receive transparent inspections with practical recommendations—no scare tactics. |
| Trusted by Local Homeowners for Generations | A reputation built through decades of consistent workmanship and word-of-mouth trust. |
| Clean, Respectful, Professional Worksites | Work completed with care for the home, landscaping, and living space. |
| Fast Response for Drainage & Water Emergencies | When water threatens your home, McDowell responds quickly to limit damage. |
Typically 3–6 days, depending on basement size and complexity.
A low-VOC, high-bond membrane applied to walls for extra moisture protection.
Yes—once trenches are patched and cured, you can install drywall and flooring.
Annual sump pump maintenance Welland is recommended, especially pre-rainy seasons.
Yes—interior solutions cost 30–50% less than exterior excavation with minimal disruption.
Basement flooding during rain indicates drainage failure or hydrostatic pressure. Professional waterproofing and drainage correction are required to prevent structural damage.
Recurring leaks mean the underlying drainage or foundation issue was never properly resolved. Permanent interior or exterior waterproofing systems are required.
Yes. Water-leaking foundation cracks worsen over time and can compromise structural integrity if not professionally repaired.
Sewer backups occur when municipal systems overload. Installing a backwater valve or repairing drainage lines is the only permanent solution.
A failed sump pump leaves your basement vulnerable to flooding. Immediate repair or replacement is required to restore protection.
Cove joint leaks occur where the wall meets the floor and require an interior drainage system—not surface patching.
Yes. Persistent musty smells signal trapped moisture and potential mold growth that must be addressed through waterproofing.
Exterior water pooling increases pressure against foundation walls and leads to leaks. Drainage correction is required.
Yes. Insurers and home inspectors often require documented waterproofing repairs before approving claims or home sales.
Finished basement damage requires immediate waterproofing to stop repeat losses and protect the home’s value.