Crawl Space Waterproofing

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Crawl Space Repair

Long Island Chooses Us

    
 
 
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   Linda Weiss 
 
 
 
 Trustindex verifies that the original source of the review is Google. We feel very fortunate to have found this company. I met with Mike regarding leaks in the basement. He assessed the entire house, gave me options and clearly explained the process. Everyone from Mike, to the secretary in the office to the workers were absolutely amazing. They did the work as promised, gave us a reasonable price, and left the place immaculate. We could not be happier with the results! This is a great family owned business. You can’t go wrong!
  
 
      Posted on Google  
   
   rose smith 
 
 
 
 Trustindex verifies that the original source of the review is Google. The work was done with the utmost professionalism and competence.  The service representative was very thorough in examining the dehumidifier, air purifier and sump pump and provided any service needed including draining the pump.
  
 
      Posted on Google  
   
   Craig Todaro 
 
 
 
 Trustindex verifies that the original source of the review is Google. Mark took it upon himself to come to my home and examine my issue himself.  He is knowledgeable not only in basement waterproofing, but also in land grading, excavating and several other adjacent topics.  While it was concluded my issue was not foundation oriented, he did not hesitate to propose several other creative ideas to help address my issue.  He has a great disposition, and I would not hesitate to recommend his services to others.
  
 
      Posted on Google  
   
   Linda Russo 
 
 
 
 Trustindex verifies that the original source of the review is Google. I bought my house 24 years ago, and for 24 years I lived with water coming in to my finished basement. A few years back I hired another company to put in a French Drain System which never worked. As the storms got worse the water in my basement increased.  Because of my previous experience I was hesitant to hire another company until I read about ACM and met Mark who was highly recommended by my Home Service Company. Mark spent about 2 hours explaining the process, and what was needed. In February 2025 ACM put a extensive French Drain System  which included taking down the sheet rock walls, demoing tile and placing a membrane along the whole perimeter of the drain system. All of this work was completed in 3 days exactly what Mark said. The guys were professional, polite, and best of all they were careful to save my Radiant Heating System which was under the tile. Since the French Drain System was placed I have not had 1 drop of water coming into my basement.  I am very grateful to Mark's ACM Company, and was able to refinish my basement without fear of water damage. I highly recommend ACM Basement Water Proofing to all who are having water problems with their basement.
  
 
      Posted on Google  
   
   Maria Lacoste 
 
 
 
 Trustindex verifies that the original source of the review is Google. ACM Basement Waterproofing did an excellent job in my basement, no more water intrusion. The job was handled professionally and on time. I am happy to recommend them.
  
 
      Posted on Google  
   
   William Rothstein 
 
 
 
 Trustindex verifies that the original source of the review is Google. I chose ACM because of their "Best of Long Island" award, and I'm glad I did. Mark's crew (led by Joe) installed an interior French drain  and a sump pump in our basement. Six months later, we've had no problems with water. These guys know what they're doing.
  
 
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   Links2282 
 
 
 
 Trustindex verifies that the original source of the review is Google. My wife and I would like to say thank you to Mark and his team for their excellent work installing a French Drain in our finished basement. For years we had to worry about flooding if we got a large amount of rain in a short time. The entire staff was totally professional. knowledgeable, competent and efficient. They were clean and caring and after each day they protected the whole worksite. Without a doubt, we would recommend them for all your basement waterproofing needs.
  
 
      Posted on Google  
   
   Peter Webb 
 
 
 
 Trustindex verifies that the original source of the review is Google. I called acm after finding water in the basement. Mark answered the call and quickly helped diagnose the issue. He guided me to check baseboard and sure enough a broken valve was causing this leak. It's good to find someone to help a homeowner without rushing to take their money. It's good to find a honest business man

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Basement Water Solutions

The Best Crawl Space Waterproofing in Long Island Near You

Suffolk & Nassau County Crawl Space Experts

If you have water in your crawl space, it can create all types of problems – mold, rot, and structural damage. But ACM can help. We install reliable crawl space waterproofing systems near you throughout Long Island, keeping your crawl space safe and dry. We have waterproofed crawl spaces throughout Long Island for decades, helping thousands of homeowners protect their homes. So call us today to schedule your free crawl space waterproofing inspection and quote.

Protect Your Home Today

We make it simple, affordable, and stress-free — with guaranteed results.

What Is Crawl Space Waterproofing??

Crawl space waterproofing is the process of keeping water out of the space beneath your home — and away from your foundation. On Long Island, where high groundwater and heavy storms are common, waterproofing is an essential step to protect your crawl space from moisture damage.

At ACM, we install perimeter French drain systems designed to collect and channel water toward a crawl space sump pump, which actively moves water away from your home through a discharge line. This combination prevents standing water, stops moisture from seeping into your floor system, and helps keep your entire home dry and stable. For added peace of mind, we also offer battery backup pumps to ensure your system keeps working during power outages.

How Did Water Get Into Your Crawl Space?

Water can get into your crawl space in a few different ways. Melted snow in the spring or heavy rains can lead to water pooling in your yard and trickling into the crawl space. Damaged gutters or missing downspouts will allow water to fall next to your foundation and into your crawl space.

If the soil around your home is waterlogged from heavy storms or you live near the shoreline, water can even seep up through the ground into your crawl space through the dirt floor or even through concrete.

Why Crawl Spaces Flood on Long Island

Long Island’s geography presents unique challenges for crawl spaces. Many homes are built in low-lying areas with high water tables, especially near the coast or in older neighborhoods. During heavy rains or rapid snowmelt, water can pool around the foundation and seep into your crawl space.

Clay-heavy or poorly draining soil makes the problem worse, as water has nowhere to go. Without a reliable waterproofing system, this moisture builds up over time, leading to mold, rot, and structural damage. That’s why homeowners searching for crawl space waterproofing near them trust local specialists like ACM — we understand the terrain and design systems that actually work in our environment.

Why Crawl Space Water is Such a Problem

Mold Growth

Mold grows in dark, damp, humid places, and mold will grow if you have a wet crawl space. As mold grows, it releases spores into the air. The spores will travel up into the rest of your home, and if inhaled by you and your family, the spores can irritate and even cause allergies.

Rot & Structural Damage

As water enters your crawl space, the wood will absorb the moisture. With high enough moisture, wood will begin to rot. The rotting wood is the support beams and wood joists of your home! A wet crawl space can lead to significant structural damage.

Lower Home Value

A wet crawl space with mold and rot damage can ruin your home’s value. No one wants to buy a home with mold and rot.

We Protect Your Home With Reliable Crawl Space Waterproofing

Crawl space waterproofing can keep mold and rot out of your crawl space, protecting your Long Island home and your family’s health.

Clean the Crawl Space

First, the crawl space needs to be cleaned and any existing water removed. If there is mold, a mold remediation company can remove it. After that, the crawl space is ready to be waterproofed.

Perimeter French Drains

We dig a trench along the perimeter of the crawl space, graded down to a sump pit. Then, we place french drain in the trench, and cover the french drain with stone. Once installed, the french drain captures any water entering the crawl space.

Crawl Space Sump Pumps

In the sump pit, we add a sump pump that collects all of the water captured by the french drain and pumps the water up and out of the crawl space. We also recommend a battery backup sump pump, ensuring the space stays dry even during a power outage when the main pump is offline.

Exterior Drainage

The water pumped out of your crawl space must be safely dispelled away from your home. We add an underground discharge line so the water is expelled at least 15 feet from your foundation.

The completed system works day and night to keep water and all the problems it brings out of your crawl space

How Crawl Space Waterproofing Protects Your Whole Home

Waterproofing your crawl space isn’t just about what’s under your feet — it protects the entire structure and health of your home. When moisture is left unchecked, it can weaken your foundation, compromise air quality, and increase energy costs.

A dry, properly drained crawl space helps:

Maintain your home’s structural integrity
Improve indoor air quality by stopping mold and mildew at the source
Lower energy bills by reducing humidity and making insulation more effective
Prevent costly repairs down the road

Long Island weather isn’t always predictable — but your crawl space can be. Let ACM help you protect your home from the ground up.

Looking for Crawl Space Waterproofing Near You?

If you’ve been searching for crawl space waterproofing near you or near me, ACM serves homeowners throughout Nassau and Suffolk Counties. We offer free inspections to find out what’s causing the water in your crawl space and what it’ll take to fix it.

Let Us Protect Your Crawl Space

There is no upside to waiting to waterproof your crawl space, only downsides. Taking care of crawl space water now can save you from expensive repairs later. You need a crawl space waterproofer near you that you can trust. So give us a call today to schedule your free inspection and waterproofing quote.

Protect Your Home Today

We make it simple, affordable, and stress-free — with guaranteed results.

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