Foundation Crack Repair in Old Westbury, NY

Stop Foundation Cracks Before They Spread

Professional crack injection and structural repairs that actually last in Long Island’s challenging soil conditions.

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Professional Foundation Repair Old Westbury

Your Foundation Problems Actually Get Fixed

You’re not looking for a temporary patch job. You want the crack sealed permanently so you can stop worrying about water seeping into your basement every time it rains hard.

That’s exactly what happens when foundation cracks get properly repaired with professional-grade injection methods. The constant stress about whether that crack is getting bigger disappears. Your basement stays dry during storms. Your home’s structural integrity gets restored instead of just covered up.

Most importantly, you get honest answers about what actually needs fixing versus what contractors often try to sell you. Not every foundation crack means your house is falling down, but the ones that do need attention require the right approach to prevent bigger problems down the road.

Foundation Repair Contractors Old Westbury

We Know Long Island Foundation Issues

Diamond Masonry & Waterproofing LLC has been handling foundation repairs throughout Nassau County for years. We understand how Long Island’s clay soil shifts with the seasons and what that means for your home’s foundation.

You’re not going to get a high-pressure sales pitch about foundation replacement when crack injection will solve the problem. We’ve seen what works long-term in this area and what doesn’t. Our approach focuses on identifying the actual issue and fixing it right the first time.

We’re licensed, insured, and equipped with professional-grade injection equipment that most contractors don’t invest in because they’re not serious about permanent results.

Foundation Crack Injection Process

Here's How We Fix Foundation Cracks

First, we assess the crack to determine what’s causing it and whether it’s structural or just settling. Not all cracks are created equal, and the repair method depends on the type and location of the crack.

For active cracks that might still move with seasonal changes, we use flexible polyurethane injection that expands and contracts with your foundation. For stable cracks, we typically use epoxy injection that essentially welds the concrete back together.

The injection process involves drilling small ports along the crack, then injecting the repair material under pressure from the bottom up. This ensures complete penetration and eliminates voids that cause future failures. The material cures to form a waterproof seal that’s often stronger than the surrounding concrete.

We clean up completely and you’re left with a permanently repaired foundation that can handle whatever Long Island weather throws at it.

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Basement Wall Crack Repair Services

What's Included in Foundation Crack Repair

Every foundation repair starts with a thorough assessment to identify the root cause of cracking. We examine soil conditions around your foundation, drainage patterns, and structural factors that might be contributing to the problem.

The repair itself includes professional crack injection using commercial-grade materials designed for Long Island’s soil conditions. We use the appropriate injection method based on whether the crack is active or dormant, horizontal or vertical, and what’s causing the movement.

You also get waterproofing benefits since properly injected cracks create a permanent moisture barrier. This prevents the freeze-thaw damage that often makes foundation cracks worse over time. We handle both interior and exterior crack repairs depending on accessibility and the specific situation.

How do I know if my foundation crack needs professional repair?

Horizontal cracks, cracks wider than a quarter-inch, or cracks that are actively growing need professional attention. You should also be concerned about cracks that leak water, especially during heavy rains. Stair-step cracks in block foundations and cracks with displacement where one side is higher than the other indicate structural movement that won’t fix itself. Small hairline cracks in poured concrete are often just cosmetic, but it’s worth having them evaluated to prevent water infiltration that can make them worse over time.

Will crack injection actually stop water from coming through my basement wall?

Yes, when done properly with the right materials. Professional crack injection creates a waterproof seal that prevents moisture penetration. The key is using injection materials that remain flexible enough to handle seasonal foundation movement without cracking. We use polyurethane injection for active cracks because it expands to fill voids and stays flexible, while epoxy works better for stable cracks that won’t move. The injection is done under pressure to ensure complete penetration through the entire wall thickness, not just surface sealing.

How long does foundation crack repair last in Long Island's climate?

Professional crack injection should last decades when done correctly with quality materials. Long Island’s freeze-thaw cycles and clay soil movement are tough on foundations, which is why the injection method and materials matter so much. Flexible polyurethane injections handle seasonal movement better than rigid repairs, while proper epoxy injection essentially welds concrete back together permanently. The repairs we do are typically stronger than the surrounding concrete. DIY crack fillers and surface sealants usually fail within a few years because they can’t handle the structural stresses.

Should I repair foundation cracks from inside or outside the basement?

Interior injection is usually more effective and less disruptive. Injecting from inside allows us to work under controlled conditions and ensures complete penetration through the wall. Exterior repairs require excavation, which damages landscaping and costs significantly more. The exception is when exterior waterproofing or drainage work is needed to address the root cause of the cracking. Most foundation cracks can be permanently repaired from the interior using professional injection techniques, and you get the same waterproofing benefits without the excavation costs.

What's the difference between epoxy and polyurethane crack injection?

Epoxy creates a rigid repair that’s stronger than concrete but doesn’t flex with movement. It’s ideal for stable cracks that aren’t going to move anymore. Polyurethane stays flexible after curing and can handle seasonal foundation movement without cracking. It also expands during injection to fill voids completely. For Long Island foundations that experience seasonal movement from clay soil expansion and contraction, polyurethane is often the better choice. We select the appropriate material based on the crack’s behavior, location, and what’s causing it to ensure the repair lasts.

How much does professional foundation crack repair typically cost?

Foundation crack injection typically costs a fraction of what you’d pay for foundation replacement or extensive excavation work. The cost depends on the crack’s length, location, and complexity, but most homeowners find it’s a worthwhile investment to protect their property value and prevent water damage. Getting multiple quotes is smart, but be wary of estimates that seem too low – proper injection requires professional equipment and quality materials. The cheapest option often means corners get cut on materials or technique, leading to failed repairs that need redoing within a few years.

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