Professional Basement Waterproofing Services in Seattle, WA

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Renova specializes in Exterior and Interior Basement Waterproofing guaranteeing you dry basement

Prevent basement mold, dampness and moisture affecting family health

Above code and industry waterproofing standards - dry, usable, and resale-ready basement adds long-term value to your property

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Our team has successfully completed hundreds of renovation projects, renovating homes and commercial spaces. We work with homeowners, businesses, and real estate developers, delivering results that earn us trust and positive feedback from our clients

Bathroom Remodel Cost in Victoria – 2025

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Kitchen Remodel in Victoria

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Finishing Basement in Victoria

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Why Choose RENOVA?

Fixed Costs,
Firm Timeframes

No hidden fees, no unexpected delays—just a clear plan with guaranteed costs and deadlines. Enjoy total peace of mind from start to finish

Top-Notch Materials

Licensed Pros

Only

Daily Updates, Zero Stress

We provide real-time updates so you're always informed. Have questions? We’re just a call or text away!

Full-Service
Contractor

From planning to completion, we take care of it all. No need to juggle multiple contractors—we make the process seamless.

Budget-Friendly Magic

We work with your budget to create the perfect space—maximizing results while minimizing costs.

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+1 232 232 454

Day and Night

Why Moisture Is More Than Just an Inconvenience

In many Seattle homes, basements weren’t originally built to be lived in. They were poured in concrete, often without full waterproofing (or with minimum effort), just to support the structure above. Why do so many basements in the area have moisture problems?! — they weren’t made to be converted to become a living space!

If the basement is just for storage, occasional dampness isn't a big deal. But once you turn that space into a bedroom, office, or playroom, it becomes a serious health and safety issue. Moisture can lead to:

Mold and mildew
Poor air quality throughout the house
Rusted plumbing and electrical hazards
Foundation cracks and settlement
Long-term health problems — especially in children

Even though concrete may dry on its own, that’s not a solution when the space is lived in. Moisture problems don’t just go away — they get worse over time.

Interior vs. Exterior Waterproofing

In existing homes, most waterproofing is done from the inside. This can be effective if done right — using sump pumps, drainage membranes, and vapor barriers, along with proper ventilation and drainage.

However, the ideal method is waterproofing from the outside. That means excavating around the foundation, waterproofing the outer walls with membranes or coatings (for best results we use asphalt roofing felt installed using a torch-down method), and installing a proper drainage system (typically gravel covered french-drains), sloping ground around the house to remove water away from the home… as far away as possible!

It’s also a good practice to insulate the foundation with R-10 rigid foam panels on the exterior. This not only helps manage moisture (prevents condensation inside finished walls) but also improves energy efficiency and comfort in the basement year-round. Especially important in Seattle’s rainy climate.

Final Thought

If you’re using your basement as living space — or plan to — proper waterproofing is a must. It protects your family’s health, your home’s structure, and avoids major costs down the line. In Seattle’s rainy, high groundwater environment, the best time to fix moisture issues is before they become visible.

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Professional Basement Waterproofing Services in Seattle, WA

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