St. Louis Waterproofing, Insulation, & Foundation Repair

Water and air leaks lead to costly structural damage and unhealthy living conditions. We repair foundations, stop leaks, and insulate homes so you can feel confident your home is healthy, protected, and built to last.

Get a Free Inspection

Photo of a home owner greeting a waterproofing inspector at the door

"We had water problems in our basement. Andrew was willing to not only answer our call, but offered to walk us through it via video call. He then went above and beyond and offered solutions as well as a written report that explained everything."

Samantha M.

O'Fallon, MO

Waterproofing

Have confidence that water won't ruin your home and everything in it.

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Insulation

Insulate your home efficiently so you stop wasting money on energy bills.

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Foundation Repair

Restore your cracked or broken foundation to prevent further damage to your home.

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The Risk

Don't risk your biggest investment

Water can destroy your home and everything in it. Poor insulation always makes your home uncomfortable.

Foundation problems gradually destroy your home.

Bad insulation wastes your money on energy bills.

Unreliable contractors offer fixes that don't last.

Get Help

The Guarantee

We protect your home the right way

You learn the real problem

Anyone can offer to fix a crack without knowing the underlying cause. We find the true problem so that your money isn't wasted.

You get the right fix

We don't just fix cracks; we create a solution system that addresses the root of the issue so that you don't call us back.

You're left with a clean home

When we work on your home we treat it carefully. And when we're done, your basement or attic will look cleaner than before.

Airtight Results

Our affordable experts have been fixing St. Louis homes and businesses for generations.

70,000+

Successful Jobs

70+

Years in Business

4.9

Review Rating

350+

Google Reviews

Get Our Free Foundation Crack Guide

Worried about a crack in your basement? Download our free guide to see how big of a problem you might be dealing with.

How it Works

The Process

Dealing with a wet basement can be overwhelming. But we've taken the mess out of it.

Contact us

Our inspectors will develop a custom plan along with a free estimate.

Property repair

Our certified repair crews will fix your broken foundation or insulation.

Enjoy your home again

Rest easy knowing you are covered by our craftsmanship warranty.

Schedule Online

Reviews

Customer Testimonials

We think we're good at waterproofing, but don't take our word for it. Listen to what our customers have to say!

Greg Dunn and Quality Waterproofing were very responsive when we had a sump pump problem. They were able to get a tech here even with the high workload after a storm, spotted the problem, and got it fixed quickly.
Ted W.
Villa Ridge, MO
I have trusted Quality Waterproofing with many home projects and they have never failed me! Andrew Timp and the service team are amazing! Will continue referring them as well as using them for my own projects!
Jade P.
St. Louis, MO
Quality Waterproofing is a company of integrity. They focus on “going the extra mile” to see that their customers receive exactly what’s needed at reasonable cost. They don’t oversell. In fact they will counsel you to follow the most prudent approach.
Randall K.
St. Louis, MO
They were amazing! They found a plumbing problem that could be the water issue. Rather than recommending expensive work off the bat like another company I contacted, they recommended I fix the plumbing issue first and see if I still had the problem. Fantastic.
Kari L.
St. Louis, MO
We had four leaking cracks in our basement repaired and we’re very happy with the service received. All of the employees were very kind and professional. The repairs were done quickly and no messes were left! Highly recommend!
Jessica H.
Pacific, MO
They didn’t try to sell on anything unreasonable and even recommended alternative solutions as to not run my bank dry. Will be calling for any and all related issues in the future.
Ali K.
St. Louis, MO
Eric Wulff is the most honest and pleasant person I have invited into my home to give me a bid on a job.
Donnie H.
St. Louis, MO

Read All Reviews

Reviews

Customer Testimonials

We think we're good at waterproofing, but don't take our word for it. Listen to what our customers have to say!

Greg Dunn and Quality Waterproofing were very responsive when we had a sump pump problem. They were able to get a tech here even with the high workload after a storm, spotted the problem, and got it fixed quickly.
Ted W.
Villa Ridge, MO
I have trusted Quality Waterproofing with many home projects and they have never failed me! Andrew Timp and the service team are amazing! Will continue referring them as well as using them for my own projects!
Jade P.
St. Louis, MO
Quality Waterproofing is a company of integrity. They focus on “going the extra mile” to see that their customers receive exactly what’s needed at reasonable cost. They don’t oversell. In fact they will counsel you to follow the most prudent approach.
Randall K.
St. Louis, MO
They were amazing! They found a plumbing problem that could be the water issue. Rather than recommending expensive work off the bat like another company I contacted, they recommended I fix the plumbing issue first and see if I still had the problem. Fantastic.
Kari L.
St. Louis, MO
We had four leaking cracks in our basement repaired and we’re very happy with the service received. All of the employees were very kind and professional. The repairs were done quickly and no messes were left! Highly recommend!
Jessica H.
Pacific, MO
They didn’t try to sell on anything unreasonable and even recommended alternative solutions as to not run my bank dry. Will be calling for any and all related issues in the future.
Ali K.
St. Louis, MO
Eric Wulff is the most honest and pleasant person I have invited into my home to give me a bid on a job.
Donnie H.
St. Louis, MO

Read All Reviews

Reviews

Customer Testimonials

We think we're good at waterproofing, but don't take our word for it. Listen to what our customers have to say!

Greg Dunn and Quality Waterproofing were very responsive when we had a sump pump problem. They were able to get a tech here even with the high workload after a storm, spotted the problem, and got it fixed quickly.
Ted W.
Villa Ridge, MO
I have trusted Quality Waterproofing with many home projects and they have never failed me! Andrew Timp and the service team are amazing! Will continue referring them as well as using them for my own projects!
Jade P.
St. Louis, MO
Quality Waterproofing is a company of integrity. They focus on “going the extra mile” to see that their customers receive exactly what’s needed at reasonable cost. They don’t oversell. In fact they will counsel you to follow the most prudent approach.
Randall K.
St. Louis, MO
They were amazing! They found a plumbing problem that could be the water issue. Rather than recommending expensive work off the bat like another company I contacted, they recommended I fix the plumbing issue first and see if I still had the problem. Fantastic.
Kari L.
St. Louis, MO
We had four leaking cracks in our basement repaired and we’re very happy with the service received. All of the employees were very kind and professional. The repairs were done quickly and no messes were left! Highly recommend!
Jessica H.
Pacific, MO
They didn’t try to sell on anything unreasonable and even recommended alternative solutions as to not run my bank dry. Will be calling for any and all related issues in the future.
Ali K.
St. Louis, MO
Eric Wulff is the most honest and pleasant person I have invited into my home to give me a bid on a job.
Donnie H.
St. Louis, MO

Read All Reviews

Videos & Articles

Waterproofing & Insulation Knowledge Base

Learn how to guard your home against water and structural damage.

Mar 6, 2026

Water in Basement After Rain — Who Should You Call in St. Louis?

Water in your basement after rain in St. Louis? Learn who to call, what causes basement leaks, and how waterproofing professionals can protect your foundation.

Mar 6, 2026

Water in Basement After Rain — Who Should You Call in St. Louis?

Water in your basement after rain in St. Louis? Learn who to call, what causes basement leaks, and how waterproofing professionals can protect your foundation.

Mar 6, 2026

Water in Basement After Rain — Who Should You Call in St. Louis?

Water in your basement after rain in St. Louis? Learn who to call, what causes basement leaks, and how waterproofing professionals can protect your foundation.

Pointing out a leak in the basement foundation wall

Feb 16, 2026

Top Signs Your St. Louis Basement Isn’t Ready for Spring Storms

Is your basement ready for spring storms in St. Louis? Learn the warning signs of foundation problems, drainage issues, and moisture buildup before heavy spring rains hit.

Feb 16, 2026

Top Signs Your St. Louis Basement Isn’t Ready for Spring Storms

Is your basement ready for spring storms in St. Louis? Learn the warning signs of foundation problems, drainage issues, and moisture buildup before heavy spring rains hit.

Feb 16, 2026

Top Signs Your St. Louis Basement Isn’t Ready for Spring Storms

Is your basement ready for spring storms in St. Louis? Learn the warning signs of foundation problems, drainage issues, and moisture buildup before heavy spring rains hit.

Feb 3, 2026

How to Make Sure Your Basement Foundation Is in Good Shape After Weeks of Below-Freezing Temperatures

After weeks of freezing temperatures, your basement foundation may be under stress. Learn how to inspect for damage, moisture issues, and warning signs—and how to protect your home before spring problems begin.

Feb 3, 2026

How to Make Sure Your Basement Foundation Is in Good Shape After Weeks of Below-Freezing Temperatures

Feb 3, 2026

St. Louis Waterproofing, Insulation, & Foundation Repair