Foundation Crack Repair in Merrick, NY

Stop Foundation Cracks Before They Stop You

Permanent crack injection solutions that actually work the first time, protecting your home’s value and your peace of mind.

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Professional Foundation Repair Contractors

Your Foundation Problems End Here

You’ll sleep better knowing those cracks aren’t getting worse. No more checking the basement after every heavy rain, wondering if today’s the day water starts pouring through your foundation walls.

Our crack injection process creates a permanent seal that’s actually stronger than the surrounding concrete. You get a dry basement that stays dry, structural integrity that protects your home’s value, and the confidence that comes from knowing the job was done right.

Most importantly, you’ll have one less thing to worry about. Your foundation becomes something you never have to think about again, instead of something that keeps you up at night wondering about water damage and repair costs.

Merrick Foundation Repair Specialists

We Know Long Island Foundations

Diamond Masonry & Waterproofing has been fixing foundation problems across Merrick and Long Island for years. We understand how clay soil shifts, what freeze-thaw cycles do to concrete, and why coastal moisture creates the specific challenges your foundation faces.

You’re not getting a generic repair crew who learned their trade somewhere else. You’re getting contractors who’ve seen every type of foundation issue Long Island throws at homes, from settling cracks in post-war construction to water intrusion in newer builds.

We’re licensed, insured, and local. When you call, you’re talking to people who live and work in your community, not a call center three states away.

Foundation Crack Injection Process

Here's Exactly What We Do

First, we inspect every crack to determine what caused it and whether it’s still moving. Not all cracks are the same, and the repair method depends on the type of crack, the wall material, and what’s happening with your foundation.

Next, we clean and prepare the crack, then inject it with polyurethane or epoxy resin under pressure. The material flows through the entire crack, even the parts you can’t see, creating a seal that’s waterproof and flexible enough to handle normal foundation movement.

Finally, we test the repair and clean up completely. You’ll know exactly what we did, why we did it, and what to expect going forward. The whole process typically takes a few hours, and you can use your basement normally right away.

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Complete Foundation Crack Solutions

Everything You Need in One Visit

You get a complete foundation assessment, not just a quick patch job. We identify all the cracks that need attention, explain what caused them, and fix everything that needs fixing in one visit whenever possible.

Our crack injection work comes with a warranty because we use professional-grade materials and proven techniques. You’re not getting hardware store caulk that’ll fail in six months. You’re getting the same polyurethane and epoxy systems that commercial contractors use on major construction projects.

We also handle the related issues that often come with foundation cracks. If you need basement waterproofing, drainage improvements, or structural repairs, we can take care of everything instead of forcing you to coordinate multiple contractors.

How long does foundation crack injection take to cure completely?

Most crack injection materials cure within 24-48 hours, but you can use your basement normally right after we finish. The polyurethane we typically use starts curing immediately and reaches full strength within a day. Epoxy injections might take slightly longer for complete curing, but both create an immediate waterproof seal. You don’t need to stay out of the area or avoid using your basement while the repair cures. The timeline depends on temperature, humidity, and crack size, but we’ll give you specific expectations for your particular repair.

Will crack injection work on both poured concrete and block foundations?

Yes, but the technique varies depending on your foundation type. Poured concrete foundations typically develop vertical or horizontal cracks that we can inject directly. Block foundations often have cracks along mortar joints or through the blocks themselves, which require different injection points and materials. We adjust our approach based on your specific foundation construction. Block foundations sometimes need additional waterproofing steps because water can travel through hollow cores. During our inspection, we’ll explain exactly how we’ll handle your particular foundation type and what results you can expect.

How much does basement wall crack repair typically cost in Merrick?

Most homeowners in Merrick pay between $300-800 per crack for professional injection repair, depending on crack length, location, and complexity. Simple vertical cracks in accessible areas cost less than horizontal cracks or repairs that require extensive preparation. The total cost depends on how many cracks need attention and whether additional waterproofing is necessary. We provide detailed written estimates that break down exactly what you’re paying for. Emergency repairs or work requiring special access might cost more, but we’ll discuss pricing upfront. Investing in proper crack repair now prevents much more expensive foundation problems later.

What's the difference between DIY crack sealers and professional injection?

DIY sealers only cover the surface of the crack, while professional injection fills the entire crack from inside the wall. Hardware store products might stop minor seepage temporarily, but they don’t address the crack itself. Professional injection uses pressurized equipment to force repair material through the complete crack, creating a structural repair that’s often stronger than the original concrete. DIY repairs typically fail within months because they can’t handle foundation movement or water pressure. Professional injection comes with warranties because it actually fixes the problem instead of just covering it up. You’ll spend less money in the long run with a proper repair.

Do foundation crack repairs come with any kind of warranty?

Yes, we warranty our crack injection work because we use professional materials and proven techniques. The specific warranty terms depend on the type of repair and your foundation conditions, but most of our injection work is covered for several years. The warranty covers the repair itself – if the crack reopens or starts leaking again, we’ll fix it at no charge. However, warranties don’t cover new cracks that might develop elsewhere or damage from major foundation settling. We’ll explain your specific warranty coverage in writing before starting work. Professional repairs with proper warranties give you protection that DIY solutions simply can’t match.

Should I be worried if I see new cracks after foundation repair?

New cracks in different locations are normal and don’t indicate that your previous repair failed. Foundations naturally develop stress points, and repairing one crack sometimes shifts stress to other areas. However, if the same crack reopens or if you see many new cracks quickly, that suggests ongoing foundation movement that needs professional evaluation. Small hairline cracks are usually cosmetic, while wider cracks or those with water seepage need immediate attention. We always explain what to watch for after completing repairs and provide guidance on when new cracks require professional assessment. Most homeowners see excellent long-term results from proper crack injection repairs.

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