314 488 2993

Basement Waterproofing Services St. Louis

Strong Homes Begin with Dry Basements

Don’t let leaks undermine your property’s foundation; fix them today to protect your home for years to come.
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Waterproofing Signs You Can’t Ignore- How We Stop It

Basements in the St. Louis area are prone to water problems from heavy rainfall, shifting soil, and aging foundations. Even small signs, such as a damp corner, musty smell, or water stains, can signal bigger issues. Ignoring them can lead to costly damage. As trusted basement waterproofing services in St. Louis, we tackle problems at the source, keeping your property dry, safe, and protected for years.
Water Seepage

Water Seepage After Rain

What You’re Seeing

After a heavy rain, water collects along the base of your basement walls or pools in the corners.

What’s Really Happening

Tiny cracks in your foundation or poor drainage are letting water seep in, causing hidden damage.

How We Fix It:

We fix foundation cracks with durable, waterproof materials so your basement stays dry. For bigger issues, we install reliable drainage systems—inside or outside—and sump pumps to keep water out for good. We also strengthen your basement’s structure, giving you lasting peace of mind.

Musty Smell

Musty Smell Or Mold

What You’re Seeing
  • Floors feel bouncy, slanted, or uneven underfoot.
  • Furniture leans or doors swing open on their own.
What’s Really Happening

Your foundation has shifted or settled in specific spots due to weak soil, poor drainage, or erosion.

How We Fix It:

We know that a musty smell or mold means moisture is getting in. With drainage systems, sump pumps, and vapor barriers, we stop water at the source. For crawl spaces, we add encapsulation and dehumidifiers to prevent mold and keep your home’s air clean.

Wall Cracks

Wall or Floor Cracks

What You’re Seeing

Hairline cracks in the concrete or gaps wide enough to slip a coin through.

What’s Really Happening

Shifting soil and hydrostatic pressure are putting stress on your foundation, causing it to move and crack over time.

How We Fix It:

We repair minor cracks with high-grade epoxy or polyurethane injections that bond and seal the concrete. For more serious damage, we install advanced wall stabilization systems to restore strength and prevent further movement.

Peeling Paint

Peeling Paint, Rust, and Warped Wood

What You’re Seeing

Flaking paint, rust creeping over metal shelving, or wood that’s warped and crumbling along baseboards and framing.

What’s Really Happening

Persistent dampness is slowly eating away at your surfaces, corroding appliances, and even compromising wiring and insulation, damage that often goes unnoticed.

How We Fix It:

We track down and eliminate the source of moisture, fully waterproof the area, and add protective moisture barriers. For ongoing protection, we install dehumidifiers to keep humidity in check and your basement dry, safe, and damage-free for years to come.

Musty Basement

Your Basement Feels More Like a Cellar

What You’re Seeing

A damp, musty basement that feels more like wasted space than part of your home.

What’s Really Happening

Poor waterproofing and ineffective drainage are making the space uncomfortable, while hidden moisture slowly puts your walls, floors, and stored items at risk.

How We Fix It:

We locate and stop the moisture at its source, seal and waterproof the space, and install durable moisture barriers. For lasting protection, we add dehumidifiers and, if needed, advanced ventilation to keep humidity under control, so your basement remains clean, healthy, and usable in every season.

The STL Way: Our 3 Steps to Your Protected Basement

We don’t just waterproof, we make it the first line of defense against water!
Step 1:

Free Foundation Inspection

We assess your home onsite or virtually, at no cost, to spot issues early and explain the next steps clearly.
Step 2:

Custom Repair Plan

Your property is unique, and so is our approach. We create a foundation repair plan designed just for your property.
Step 3:

Fast, Worry-Free Repairs

We fix it right the first time, keep your space clean, and leave you with a strong foundation backed by our warranty options.

Don’t wait until the next downpour turns into a disaster.

Secure My Dry Space Now!

Keep Water Out. Keep Your Property Value In.

Waterproofing your basement unlocks extra space, keeps you worry-free in any weather, and safeguards your building, health, and investment.

Shield Your Foundation

Improve Indoor Air Quality

Maintain Property Value

Unlock Extra Living Space

Stay Stress-Free in Any Weather

Stopping Leaks. Protecting Homes. Improving Integrity.

  • Fast, Non-Invasive Waterproofing.
  • Permanent, First-Time Fixes.
  • Leak, Crack & Drainage Experts.
  • Local Knowledge of STL Soils.
  • Most Jobs Completed in a Day.
  • Warranty-Backed Protection.
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The Basement Doesn’t Call for Help – But You Can!

Shield your basement from St. Louis’ wettest days.

Get My Free Inspection

Flexible Financing That Works for You

 Protect Your Property Now – Pay Over Time
Basement waterproofing can feel overwhelming, both in urgency and cost. We get it. That’s why we offer flexible financing options that make it easy to get the repairs your building needs today, without breaking the bank.
  • Financing available for all credit types.
  • Friendly support throughout the process.
  • Help keep your property’s value strong.
  • Custom payment plan made for basement waterproofing repairs.

Ready To Protect Your Property?

Apply For Financing Today
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Frequently Asked Questions

Watch for warning signs like damp walls, musty odors, water stains, peeling paint, mold growth, or visible cracks in the foundation. In St. Louis homes, frequent heavy rains and clay-rich soils can make these issues more common, early action helps avoid costly repairs later.
Basement leaks often stem from poor drainage, foundation cracks, hydrostatic pressure, or clogged gutters. As a trusted basement waterproofing company in St. Louis, we address the root cause with required and fix them right immediately.
Most projects in St. Louis are completed in just one to three days, depending on the size of the basement and the type of waterproofing system installed.
Yes, we provide flexible financing plans so you can get your waterproofing project started right away without stressing your budget.
Costs vary depending on the extent of water damage, chosen repair method, and basement size. In St. Louis, waterproofing projects can range from a few hundred dollars to several thousands for complete waterproofing systems.

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STL PolyJack

6853 OLIVE BLVD,
ST. LOUIS, MO 63130

Operations

575 RUDDER ROAD,
SUITE 101-104,
FENTON, MO 63026

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    STL Polyjack is continuously monitoring the guidelines provided by the CDC, the World Health Organization, Federal, State, and Local governments. While we navigate through these unprecedented times, our customers remain our highest priority. STL Polyjack will remain open to serve its customers, as we have been considered an essential business by St. Louis County, MO, and are committed to maintaining the highest standards of safety measures

    FREE Video - Estimation

    STL Polyjack management has implemented extensive safety measures for our technicians and customers. We are currently offering FREE video estimation for our customers, all you need is a good cell phone with good internet connectivity. While filling the form, simply ask for video estimation and we will call you to schedule an appointment.

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