Waterproofing Contractor in Bronx, Brooklyn, Queens and Manhattan
Protect your property from water damage with our reliable waterproofing solutions and advanced materials.
Waterproofing Contractor
Licensed Waterproofing Contractor Serving All Four Boroughs
Water is the single most expensive thing that happens to a New York building. It rots framing, rusts lintels, feeds mold, spalls brick and quietly destroys finishes long before anyone sees a puddle. Alliance General Contracting NY Inc waterproofs basements, walls, roofs and chimneys throughout the Bronx, Brooklyn, Queens and Manhattan diagnosing where water enters rather than selling one product for every problem.
Interior sealers, exterior excavation and membrane, French drains, sump systems, grading correction, and repointing all solve different problems. A basement that leaks only during heavy rain usually has a grading or downspout issue; one that seeps constantly at the cove joint is a hydrostatic pressure problem needing drainage. Our estimate explains which one you have and why.
Every waterproofing contractor project starts with a free on-site estimate and a written scope. We are based at 2362 Westchester Ave, Bronx, NY 10462 close enough to the whole Bronx to respond quickly, and working daily in Brooklyn, Queens and Manhattan. Call 718-737-2143 or email info@alliancegeneralcontractingny.com to get on the schedule.
All Waterproofing Contractor Services
Basement Waterproofing
Dry out a chronically wet cellar with a system matched to how water is actually getting in interior drainage and sump, exterior membrane, or corrected grading and drainage.
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Roof Waterproofing
Seamless membrane and coating systems that turn an aging low-slope roof into a fully sealed, reflective surface with no seams for water to exploit.
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Wall Waterproofing
Exterior masonry walls sealed against wind-driven rain with breathable repellents, crack repair and repointing that keeps moisture out without trapping it inside.
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Residential Waterproofing
A whole-house approach for homeowners: gutters, grading, foundation, walls and roof reviewed together so the fix addresses the system, not just the symptom.
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Commercial Waterproofing
Multifamily, retail and mixed-use buildings protected with plaza deck, below-grade and facade waterproofing scheduled around tenants and business hours.
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Roof Sealing
Targeted sealing of the details that leak first seams, flashing, vents, skylight curbs and parapet caps extending roof life without a full replacement.
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Chimney Waterproofing
Chimneys absorb water from every side and dump it into the wall below.
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Why Choose Us
Why Choose Us For Waterproofing Contractor
Diagnosis before product
We identify the actual water path instead of defaulting to one system.
Interior and exterior systems
Drainage, membranes, sump pumps, coatings and grading correction.
Structural coordination
Masonry, roofing and concrete handled by the same licensed contractor.
Documented, warrantied work
Photos of every buried layer so you know what you paid for.
What Our Clients Say
Trusted By NYC Homeowners
Common Questions
Frequently Asked Questions
That pattern usually points to surface water clogged gutters, downspouts discharging at the foundation, or grading pitched toward the house. Those fixes are far cheaper than excavation.
Exterior membrane and drainage is the most complete solution but requires excavation. Interior drainage with a sump is less invasive and often the right call in tight NYC lots. We recommend based on your conditions.
We remove and dispose of affected non-structural materials, treat surfaces, and rebuild. Extensive contamination is referred to a licensed abatement specialist.
Ready to build your dream project?
Let's Build Something Great Together
Contact us today for a free consultation and let's bring your vision to life. Licensed, insured and serving the Bronx, Brooklyn, Queens and Manhattan.
