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Long Island Chooses Us
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Linda Weiss profile picture
Linda Weiss
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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!
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rose smith profile picture
rose smith
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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.
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Craig Todaro profile picture
Craig Todaro
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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.
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Linda Russo profile picture
Linda Russo
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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.
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Maria Lacoste profile picture
Maria Lacoste
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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.
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William Rothstein profile picture
William Rothstein
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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 profile picture
Links2282
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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.
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Peter Webb profile picture
Peter Webb
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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
Bethpage Best of Long Island Winner warded to ACM Basement waterproofing
Angi Super Service Award for ACM Basement Waterproofing in Long Island
Basement Health Association Star award given to ACM Basement Waterproofing in Long Island

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Best of Long Island Award for Basement Waterproofing in Long Island
Angi Super Service Award for Basement Waterproofing in Long Island

Long Island Foundation Damage Problem Signs & Symptoms In Your Home

Symptoms of Foundation Issues to Watch For In Your Long Island Home

Your Long Island home’s foundation faces shifting soil conditions, coastal weather patterns, and seasonal changes. Understanding the warning signs of foundation problems is essential for protecting your property. Early detection of these issues can save you thousands in repairs and prevent serious structural complications.

Regular foundation inspections are crucial for Long Island homeowners. Changes in your foundation’s condition can occur gradually or suddenly, especially after severe weather events or prolonged wet seasons. Watch for signs like sticking doors, uneven floors, or gaps between walls and ceilings. These subtle indicators often signal underlying foundation problems that require professional attention.

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Long Island Foundation Damage Signs

Common Foundation Problem Signs

Foundation problems often begin with small warning signs that gradually worsen over time. Cracks, bowing walls, leaning foundation sections, and shifting masonry can all indicate underlying structural stress affecting your Long Island home. Identifying these issues early can help prevent more extensive damage and costly repairs in the future.

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Foundation Wall Cracks

Cracks in your foundation walls might start small but can indicate serious structural issues that will grow over time. Hairline cracks under 1/8 inch may be normal settling, but anything greater requires attention. These cracks often allow moisture to enter your basement and can compromise your foundation’s integrity.

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Horizontal Foundation Cracks

Horizontal wall cracks typically appear due to excessive soil pressure against your foundation walls. These cracks run parallel to the ground and often indicate significant structural weakness. Long Island’s varying soil conditions, particularly after heavy rains, can create intense pressure that leads to these concerning cracks.

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Permanent repair for stair-step cracks in the basement walls of your Long Island home

Stair-Step Foundation Cracks

Commonly appearing in block or brick foundations, stair-step cracks follow the mortar joints in a distinctive pattern. These cracks often result from uneven settlement or soil movement beneath your foundation. On Long Island, where soil composition can vary significantly, these cracks frequently signal foundation stress requiring professional evaluation.

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Long Island brick and block foundation wall repair

Brick and Block Foundation Wall Damage

Deteriorating mortar joints, crumbling blocks, or displaced bricks in your foundation wall indicate serious structural concerns. This type of damage often results from water exposure, freeze-thaw cycles, and soil pressure – all common challenges in Long Island’s climate. Look for bulging sections, loose materials, or white powder deposits on brick surfaces.

Long Island Bowing Basement Wall REpair

Bowing Basement Wall

Bowing walls occur when exterior pressure becomes too great for your foundation to resist. This condition appears as an inward curve in your basement wall and represents a serious structural concern. Long Island’s clay-rich soils can expand significantly when wet, creating the pressure that causes walls to bow.

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Repair for damaged and leaning foundation walls in Long Island

Leaning Basement Wall

When foundation walls begin to lean inward from the top, it indicates severe structural compromise. This condition often results from improper drainage, soil issues, or inadequate construction – problems that can be exacerbated by Long Island’s frequent rain and varying soil conditions. Leaning walls require immediate professional attention to prevent potential collapse.

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Long Island shearing foundation wall repair

Shearing Basement Wall

Shearing occurs when different sections of your foundation wall move in opposite directions, creating a dangerous structural condition. This severe damage often appears near corners or where different foundation sections meet, more common with block foundations.

Don’t Ignore the Warning Signs of Foundation Damage

Foundation problems rarely improve on their own. Small cracks, bowing walls, and shifting foundation sections often become more severe over time, leading to larger structural issues, water intrusion, and more expensive repairs. The good news is that many of these problems can be stabilized and repaired when addressed early by an experienced Long Island foundation specialist.

Whether your home is showing signs of wall cracking, settlement, leaning walls, or structural movement, professional repair solutions can help restore stability and protect your property long-term. If you’ve noticed any of the warning signs listed above, now is the time to schedule a professional inspection and prevent further damage to your Long Island home.

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Are Foundation Cracks Normal?

Not every foundation crack indicates serious structural damage, but some cracks are clear warning signs of larger foundation problems. Small hairline cracks can occur naturally as a home settles over time. However, horizontal cracks, widening cracks, stair-step cracks, or cracks accompanied by bowing walls or water intrusion should always be professionally evaluated.

Long Island soil movement, moisture changes, and freeze-thaw cycles can quickly turn minor foundation issues into larger structural concerns if left untreated.

Long Island Homes Are Especially Vulnerable to Foundation Issues

Long Island homes are exposed to a combination of coastal moisture, heavy rainfall, fluctuating groundwater levels, and expanding soils that can place constant stress on foundation walls. Older homes throughout Nassau and Suffolk County may also experience aging foundation materials and drainage issues that contribute to cracking and structural movement.

Because foundation issues can develop differently depending on soil conditions and home construction, professional inspections are important for identifying the underlying cause of the damage.

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What Happens If Foundation Problems Are Ignored?

Foundation damage typically worsens over time. What begins as a small crack or minor wall movement can eventually lead to significant structural instability, basement water intrusion, uneven floors, and damage throughout the home.

Ignoring foundation issues may also increase repair costs in the future, as continued movement places additional stress on your home’s structure. Early detection and repair are the best ways to protect your property and avoid larger structural repairs later on.

Your Long Island Foundation Repair Specialists Near You

Foundation problems require expert attention from Long Island foundation professionals. Our team specializes in identifying and repairing all types of foundation damage, using proven solutions. Don’t wait until minor issues become major problems – contact us today for a thorough foundation inspection and expert foundation repair solutions to protect your home’s structural integrity.

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