Stop Water Damage Before It Starts
IronSky waterproofs roofs, terraces, balconies, brick facades, foundations and basements across NYC. Liquid-applied membranes, elastomeric coatings, French drains and sealers — backed by long-term warranties.
Common Waterproofing Problems We Fix
- ✓Recurring leaks that keep coming back after patches
- ✓Wet basements, efflorescence or musty smells
- ✓Cracked, pooling or damaged terrace and balcony surfaces
- ✓Water staining on brick, brownstone or stucco facades
- ✓Foundation seepage during heavy rain
- ✓Failing parapet walls and roof edges
Our Waterproofing Services Include
- Liquid-applied roof and terrace membranes
- Elastomeric and silicone roof coatings
- Brick, brownstone and stucco facade sealing
- Basement & interior French drain systems
- Sump pump installation and crack injection
- Foundation membrane systems with drainage board
Our Waterproofing Process
- STEP 01Moisture SurveyInfrared scan and visual inspection to map every entry point.
- STEP 02Custom SystemWe spec the right membrane, sealer or drain system for the substrate.
- STEP 03Professional InstallCertified applicators, manufacturer-spec prep and full curing.
- STEP 04Long-Term WarrantyDocumented warranty plus optional maintenance plan.
Why Choose IronSky for Waterproofing
Residential Waterproofing
Brownstone facades, terraces, basements and roofs on homes and townhouses across the boroughs.
Commercial Waterproofing
Multi-family, mixed-use and commercial waterproofing — facades, plaza decks, balconies and foundations.
24/7 Emergency Waterproofing
Active leaks during storms? Our team responds 24/7 with emergency seal-ups and same-day moisture mapping.
Waterproofing Project Gallery
A look at recent waterproofing projects completed by the IronSky crew across NYC.
Real Results From Our NYC Jobs
Side-by-side photos from recent IronSky projects across the five boroughs.
Related Services
Roofing
From small shingle repairs to full tear-offs and new installations, IronSky delivers durable, code-compliant roofing across all fi…
Learn moreMasonry
From tuckpointing pre-war brick to restoring brownstone facades and rebuilding parapets, IronSky's masons handle every stone and b…
Learn moreStucco
Crack-free, color-matched stucco repair plus traditional 3-coat and EIFS systems for new exteriors. Sealed and waterproofed to han…
Learn moreWaterproofing — Frequently Asked Questions
How much does waterproofing cost in NYC?+
NYC waterproofing typically runs from $800 for small terrace patches to $15,000+ for full basement or facade systems. IronSky provides free on-site evaluations with itemized pricing and no hidden fees.
How long does waterproofing last?+
Liquid-applied membranes last 15–25 years, brick and brownstone sealers 7–10 years, and properly installed basement French drain systems are designed to last the life of the building.
What areas can you waterproof?+
We waterproof roofs, terraces, balconies, brick and brownstone facades, foundations, and basements across all 5 NYC boroughs, Long Island, and Yonkers.
Is IronSky licensed and insured for waterproofing in NYC?+
Yes. IronSky is fully licensed, bonded, and insured in New York State. We carry full liability and workers' compensation coverage.
Waterproofing Service Areas
We provide waterproofing across all 5 NYC boroughs, Long Island and Yonkers.
Ready for Expert Waterproofing in NYC?
Free, no-pressure estimates. Same-day callbacks. Licensed & fully insured.
