Roof & Building Waterproofing in NYC: Decks, Walls & Terraces
Waterproofing is more than a coat of sealer. East NYC Roofing protects roofs, terraces, decks and exposed walls with proper membranes, flashing and drainage, so water is sent away from the structure instead of soaking in and causing hidden damage.
- 20 years in business
- 10-year warranty on replacements
- Within 2 hours for leaks
- Free written estimate
Problems this solves
- Leaks on terraces, balconies and roof decks
- Water entering at parapet walls and copings
- Damp or stained top-floor ceilings
- Peeling paint and bubbling plaster on walls
- Efflorescence on brick or concrete
- Cracked or failed sealant joints
- Water seeping through bulkheads or door thresholds
- Ponding on decks or terraces
- Recurring leaks after surface patching
- Moisture trapped in insulation or framing
Waterproofing explained
Waterproofing is the layered system that keeps water out of a building where the roof or exterior is exposed. Depending on location, it can be a liquid-applied or sheet membrane under a terrace, a coating over a sound surface, sealed joints and flashings at walls, or properly sloped drainage. The surface you see is often not the waterproofing layer. Getting the substrate, slope, membrane and terminations right matters more than the product name, and a surface coating alone cannot fix a failed system underneath it.
Options and materials
Terrace and deck waterproofing
Membranes installed beneath pavers, tile or decking, with drainage and protection layers, so the usable surface above does not leak into the room or apartment below.
Liquid-applied membranes
Seamless fluid coatings that cure in place, useful around penetrations, corners and irregular shapes where sheet goods are difficult to fit without gaps or weak seams.
Sheet and built-up membranes
Roll-applied waterproofing for larger areas, with sealed seams and carefully detailed edges, offering consistent thickness and proven performance on big flat surfaces. We walk you through this option in plain language.
Wall and parapet waterproofing
Sealing coping joints, repointing, flashing and treating masonry so water stops entering from the top and sides of the wall and traveling down inside it.
Sealant and joint renewal
Replacing failed sealant at expansion joints, window perimeters and junctions with fresh, compatible materials, after removing the old material that no longer bonds. Ask us which suits your building best.
Our process
- Leak and moisture investigationWe inspect from above and below, checking slope, joints, flashing and the surface, to locate where water gets in and where it travels afterward.
- Written scopeYou get a plain description of the proposed system, what layers go where, and what is and is not included, so the proposal is easy to compare.
- Surface preparationExisting coatings or failed material are removed as needed, repairs are made, and the substrate is cleaned and dried so the new system bonds properly.
- Install waterproofing layersMembranes or coatings are applied according to the manufacturer's installation requirements, with extra attention at corners, drains, penetrations and other vulnerable points.
- Terminations and flashingEdges are terminated and flashed at walls, doors and drains so that water cannot get behind the membrane and travel under the finished surface. You can ask us questions at any point.
- Water test and finishWhere practical we test the area, then restore the surface finish, clean up, and provide photos and a written warranty reference to close out the job.
What affects the price
Area to be waterproofed
Larger areas need more material and labor, but small areas carry fixed setup costs that raise the per-foot figure compared with big open surfaces.
System type
Liquid membranes, sheet membranes and multi-layer systems differ in material cost and installation time, and the right one depends on the location and use.
Surface removal and restoration
Lifting pavers, decking or tile to reach the membrane, then putting everything back, can be a large share of the total work on a terrace or deck.
Substrate condition
Cracked concrete, soft decking or poor slope must be corrected before waterproofing will work, and that corrective work is scoped separately and clearly.
Number of details
Drains, door thresholds, railings, penetrations and parapets each require custom detailing, and every added detail means more time and more materials.
Access and protection
Upper floors, shared roofs and finished interiors below call for extra protection and staging, which adds setup time before the waterproofing work begins.
Getting a price
Because these factors change from roof to roof, we don't publish one-size-fits-all prices. We inspect your roof for free and give you a written, itemized estimate before any work starts.
Every waterproofing job includes
- Leak investigation and moisture review
- Written scope of the waterproofing system
- Permit handling where required
- Protection of finished areas and entries
- Surface preparation and repairs
- Membrane or coating installation as scoped
- Flashing and terminations at edges and penetrations
- Drain detailing
- Debris removal and cleanup
- Written workmanship warranty, terms on our warranty page
Written workmanship warranty on every job; full roof replacements carry our 10-year warranty. Warranty terms.