NYC Waterproofing Experts
Water is the #1 enemy of buildings in New York City. Between heavy rainfall, snowmelt, aging infrastructure, and high water tables, Queens and Brooklyn properties face constant water intrusion threats. Left untreated, water damage leads to mold, structural deterioration, and tens of thousands of dollars in repairs.
NYC Flat Roof Pros provides complete waterproofing services — from roof membranes down to foundation walls. We don't just patch leaks; we identify the source of water intrusion and install permanent solutions that protect your building for decades.
💧 Seeing Water Where It Shouldn't Be?
Don't wait for small leaks to become big problems. We offer free waterproofing inspections for Queens & Brooklyn property owners. We'll find the source and give you honest options.
Request Free Inspection →Our Waterproofing Services
Basement Waterproofing
Interior & exterior basement waterproofing systems. French drains, sump pumps, vapor barriers, and crack injection.
Starting at $2,500
Foundation Waterproofing
Exterior foundation membranes, drainage boards, and grading corrections to keep water away from your foundation walls.
Starting at $3,000
Roof Waterproofing
Flat roof membrane systems, torch down, liquid-applied membranes, and roof coatings that create a watertight barrier.
Starting at $1,500
Building Envelope
Complete building waterproofing — exterior walls, joints, windows, parapets. Stop water at every entry point.
Starting at $4,000
Bathroom/Wet Area
Waterproofing for bathrooms, kitchens, laundry rooms. Membrane systems beneath tile to prevent subfloor damage.
Starting at $800
Exterior Drainage
French drains, curtain drains, dry wells, and grading solutions to redirect water away from your building.
Starting at $1,500
⚠️ Warning Signs You Need Waterproofing
- Water stains on basement walls or ceiling
- Musty or moldy smell in lower levels
- Efflorescence (white mineral deposits) on walls
- Cracks in foundation walls
- Peeling paint or bubbling on interior walls
- Standing water after rain in basement or crawl space
- Damp or wet spots on floors
- Higher humidity levels in your building
If you notice any of these signs, get a professional inspection before the damage spreads.
Why Queens & Brooklyn Buildings Need Waterproofing
Aging Building Stock
Many Queens and Brooklyn buildings are 50-100+ years old. Original waterproofing materials have long since degraded. Without modern waterproofing systems, these buildings are vulnerable to water damage that accelerates structural deterioration.
High Water Table
Parts of Queens and Brooklyn — especially near the coast and former marshland — have high water tables that put constant hydrostatic pressure on foundation walls. Proper drainage and waterproofing is essential in these areas.
NYC Weather Extremes
Heavy rain events are increasing in frequency. NYC gets 50+ inches of rain per year, plus snow and ice. Buildings without proper waterproofing face repeated water intrusion that causes cumulative damage over time.
Building Code Compliance
NYC building codes require waterproofing for new construction and major renovations. If you're renovating, adding a roof deck, or converting space, waterproofing may be required to pass inspection.
📞 Protect Your Investment
Waterproofing is an investment that prevents tens of thousands in future repair costs. Get a free assessment and learn what your building needs.
Get Free Waterproofing Estimate →Frequently Asked Questions
How much does waterproofing cost in NYC?
Costs vary significantly based on the scope. Interior basement waterproofing starts at $2,500-$5,000. Exterior foundation waterproofing runs $5,000-$15,000 depending on building size. Roof waterproofing ranges from $1,500 for coatings to $8,000+ for full membrane systems. We provide detailed free estimates.
Is interior or exterior waterproofing better?
Exterior waterproofing stops water before it reaches your walls — it's the most effective but more expensive (requires excavation). Interior waterproofing manages water that's already entered — it's less disruptive and more affordable. Often, a combination approach works best. We'll recommend the right solution for your specific situation.
How long does waterproofing last?
Quality waterproofing systems last 15-25 years or more. Exterior membrane systems can last the life of the building. Interior solutions like sump pumps need periodic maintenance. We use premium materials and provide warranties on all our work.
Can you waterproof during winter?
Interior waterproofing can be done year-round. Exterior work is best done in warmer months when the ground isn't frozen, though emergency repairs are always available. Roof waterproofing with torch-applied systems can be done in cold weather.
Do I need waterproofing if I'm building a roof deck?
Yes — it's required by code and essential for protecting the building below. Before any roof deck is installed, a proper waterproof membrane system must be in place. We install the waterproofing layer that goes beneath your deck structure.