Professional Chimney Waterproofing You Can Rely On
Chimneys absorb water from every side and dump it into the wall below. We crown, cap, flash and seal them so the stack stops feeding leaks into your ceilings.
Alliance General Contracting NY Inc is a licensed and fully insured contractor operating out of 2362 Westchester Ave in the Bronx. Chimney Waterproofing is one of the services our waterproofing contractor division performs week in and week out, and searching for chimney waterproofing NYC or chimney waterproofing near me should bring you to a team that actually works in your neighborhood rather than a call center three states away.
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.
What's Included
- ✓Crown repair or rebuild
- ✓ Rain cap installation
- ✓ Counterflashing replacement
- ✓ Repointing of the stack
- ✓ Breathable masonry sealer
- ✓ Interior leak verification
Why NYC Properties Need Chimney Waterproofing
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.
Across the four boroughs we work on two-family brick homes, pre-war walk-ups, semi-detached row houses and mixed-use storefront buildings; limestone and brownstone rowhouses, three-family frame homes and converted industrial lofts; attached brick colonials, Tudor-style singles, garden co-ops and two-family investment properties; pre-war co-ops, brownstone conversions, tenement-era multifamily buildings and high-rise condo interiors. Each of those building types ages differently, and chimney waterproofing is specified accordingly what suits a detached Bayside colonial is not what suits a shared-wall Bed-Stuy rowhouse or a fifth-floor pre-war apartment in Washington Heights. That judgment is the part you are really hiring a licensed contractor for.
Signs You Need Chimney Waterproofing Now
Property owners usually call us after they notice one of the following: visible staining or discoloration on interior finishes, a musty smell that returns after every rain, hairline cracking that keeps widening season over season, materials that are loose, spalling, sagging or separating, rising utility bills that suggest a compromised building envelope, or a condition flagged on an inspection or violation notice. None of these get cheaper with time. Water in particular finds a path and then keeps using it, and by the time damage is obvious the repair has usually doubled in scope.
If you are seeing any of that, book the free estimate. We will tell you honestly whether it is urgent, whether a targeted repair will do, or whether you can safely budget for it next season.
Timeline and What To Expect
After your free walkthrough you receive a written, line-item scope with materials named and allowances stated. Once you approve it we confirm material lead times, arrange any filings the work requires, and give you a start date with a realistic duration. On site we protect the surrounding areas before work begins, keep the space clean at the end of each day, and send you progress photos of anything that will be covered up. When the work is done we walk it with you and close out every punch item before invoicing the balance.
Permits and code compliance are handled as part of the job where applicable. New York City has real requirements around structural work, sidewalks, facades, plumbing and electrical, and doing it properly protects your resale, your insurance position and your neighbors.
