About Canada Waterproofers

Built on Integrity. Led by Experience. Trusted by Homeowners Across Ontario.

Canada Waterproofers was founded on a simple principle that has guided our work for over 27 years: do the job right, tell people the truth, and stand behind your work.

In an industry where rushed inspections, unnecessary repairs, and sales‑driven recommendations have become common, Canada Waterproofers continues to operate differently. We are an owner‑operated company built on old‑school values—where workmanship, accountability, and reputation matter more than volume.

We specialize in waterproofing, drainage, plumbing, and structural water protection, providing homeowners with solutions that are accurate, durable, and cost‑effective. Every home is different, and we believe every solution must be as well.

At the core of our company are its two owners:
Carl McDowell and Slava Koval.

Owner‑Operated. Personally Accountable.

When you contact Canada Waterproofers, you deal directly with the owners. You will not be evaluated by a sales representative or passed between departments. One of the owners—Carl McDowell or Slava Koval—will personally attend your home to assess the situation.

This approach ensures:

• Accurate inspections by experienced professionals
• Honest explanations without pressure
• Real accountability from diagnosis to completion

Our goal is not to sell work—it is to solve problems properly and permanently.

Experience That Prevents Costly Mistakes

Together, Carl and Slava bring over 30 years of combined hands‑on experience in:

• Waterproofing systems
• Plumbing and drainage
• Foundation and structural water issues
• Underpinning and building renovation

They regularly diagnose issues that appear to be “waterproofing problems” but are actually caused by plumbing failures, poor drainage design, foundation movement, or aging infrastructure. This comprehensive understanding allows us to recommend only the work that is truly necessary, saving homeowners thousands of dollars in unnecessary repairs.

Fully Licensed. Highly Credentialed. Provincially Approved.

Carl McDowell and Slava Koval are both:

• Master Plumbers
• Licensed Waterproofers
• Licensed Building Renovators
• Underpinning Specialists
• Water Damage Restoration Certified Technicians

In addition, Canada Waterproofers is:

• A Halton Preferred Contractor
• Licensed throughout Ontario for rebate‑eligible work
• Fully insured with $5 million in liability coverage

These credentials mean homeowners can trust that their work is performed to professional standards, qualifies for applicable rebate programs, and is fully protected under proper insurance and licensing.

Old‑School Values, Modern Technology

While our values are rooted in traditional craftsmanship and integrity, we utilize modern materials, proven systems, and the latest diagnostic technologies to protect today’s homes.

We believe quality work is not just about what materials are used—but how they are installed, how details are handled, and how a job site is respected. Every home we work on is treated as if it were our own.

Transparent Pricing & Lifetime Protection

Every homeowner receives:

• A free, no‑obligation written quote
• Clear explanations of recommended work
• Honest advice about what does not need to be done

All completed work is backed by a lifetime, fully transferable written warranty, providing long‑term peace of mind and added value to your property.

Built for Today’s Climate and Aging Homes

With changing weather patterns, increased rainfall, and aging infrastructure across Ontario, protecting homes from water damage is more complex than ever. Experience—not guesswork—is essential.

Canada Waterproofers combines decades of real‑world knowledge with modern solutions designed to handle today’s conditions and tomorrow’s challenges.

Meet the Owners

Carl McDowell

Canada Waterproofers Technician in Uniform

Diagnosis, Precision, and Long‑Term Solutions

Carl McDowell is known for his methodical and analytical approach to diagnosing water issues. As a Master Plumber, licensed waterproofer, and water damage restoration certified technician, Carl understands how plumbing systems, drainage, foundations, and structures interact.

He focuses on identifying root causes, not surface symptoms. Carl believes homeowners deserve:

• Clear explanations
• Honest recommendations
• Solutions that last

His attention to detail and refusal to cut corners have built long‑standing trust with homeowners throughout Ontario.

Craftsmanship, Accountability, and Hands‑On Leadership

Slava Koval is a Master Plumber, licensed waterproofer, licensed building renovator, and certified water damage restoration technician. He takes a hands‑on role in every project, ensuring that installations are completed correctly and to the highest standards.

Slava believes true accountability comes from being on site, involved in the work, and standing behind the finished result. Homeowners value his straightforward communication, fair pricing, and commitment to doing only what is necessary—and doing it right.

Owners Who Stand Behind Every Job

If you move forward with Canada Waterproofers, one or both owners will be present on your project, overseeing the work and ensuring it meets the standards their reputation is built on.

Our Commitment

We value our customers, respect their homes, and take pride in every job we complete. Our business is built on referrals, repeat clients, and work that continues to perform years after installation.

If you are looking for integrity, experience, and owner‑led workmanship you can trust, Canada Waterproofers—led by Carl McDowell and Slava Koval—is here for you.