Flat-Roof Experts
for a Row-House Borough
Stand on a Brooklyn block and look up. Behind the parapets of Park Slope, Bay Ridge, and Bensonhurst sit flat and low-slope roofs, not the pitched shingle roofs you find in the suburbs. That difference changes everything about how a roof is built and where it fails.
J. Great Roofing has served New York homeowners since 1999 as a GAF Master Elite contractor. In Brooklyn that means single-ply membrane systems, tight parapet and cornice detailing, and a crew that understands the tight access, shared walls, and landmark rules that come with dense, historic housing.
A brownstone roof packs a lot into a small footprint: tall parapets, chimneys, skylights, roof hatches, and sometimes a deck, all crowded onto a flat surface with only a drain or two. Get any one detail wrong and water finds the top-floor ceiling. We treat the whole roof as one waterproofing system, from Cobble Hill and Fort Greene to Sunset Park and Ditmas Park.
Historic Housing,
Ponding & Parapets
Much of Brooklyn's housing went up between the 1880s and the 1930s, from Park Slope brownstones and Flatbush limestone row houses to the attached brick homes of Bensonhurst and Bay Ridge. Flat roofs drain slowly, so water ponds and finds the weak seam.
NYC weather makes it harder. Nor'easters, heavy snow load, and hot UV summers all punish a membrane, while shared party walls and tight rear-yard access mean there is no room for error on the flashing. Many older row houses also carry several roofing layers stacked from decades of quick fixes, and those trapped layers hide the true source of a leak until a proper tear-off exposes it.
- Ponding water — low-slope roofs with few drains hold water that works into every seam
- Parapet & cornice leaks — cracked flashing where the roof meets the perimeter wall and street-facing cornice
- Failed drains & scuppers — clogged interior drains and scupper details that back water up behind the parapet
- Aging EPDM, TPO & tar — split seams and blisters on membranes and old built-up roofs past their life
- Stacked roof layers — decades of quick patches piled on top of each other that hide the real leak
- Landmark & access limits — historic-district cornices and tight row-house access that demand careful staging
Roofing Services
in Brooklyn
From a single ponding leak behind the parapet to a full flat-roof replacement, every roofing and exterior need on Brooklyn's brownstones and row houses, handled by a GAF Master Elite crew.
Flat & Low-Slope Roofing
EPDM rubber and heat-welded TPO membrane systems for brownstones and row houses, with parapet and drain detailing done right.
Flat Roofing
Roof Repair
Ponding leaks, split membrane seams, and the failed parapet, cornice, and drain flashing that plagues older Brooklyn roofs.
Roof Repair
Siding & Gutters
Vinyl and fiber-cement siding, seamless gutters, soffit and fascia for Brooklyn's freestanding and semi-attached homes.
Siding & Gutters
24/7 Emergency Service
Water pushing through the top-floor ceiling after a nor'easter? We respond around the clock to stop active leaks across Brooklyn.
Storm DamageWhy Brooklyn Homeowners
Choose J. Great Roofing
Plenty of contractors will quote a flat roof. Far fewer carry GAF Master Elite certification and know how to detail a parapet on a landmarked brownstone. That combination is where the leaks get stopped for good.
GAF Master Elite®
A certification held by only the top 3% of roofing contractors in the country.
Golden Pledge® Warranty
Lifetime coverage on both materials and workmanship — protection most local roofers can't offer.
Flat-Roof Detailing
Membrane, parapet, cornice, and drain work done as one system, so water actually stays out.
Trusted Since 1999
25+ years serving New York homeowners, with 87+ verified five-star reviews behind the work.
Rated 5.0 Stars by New York Homeowners
Across 87+ verified reviews, homeowners point to the same things: leaks tracked to the real source, clean flashing and membrane work, and job sites left tidy on tight Brooklyn blocks. Licensed and insured in New York State, open 7am–7pm Monday through Saturday.
Brooklyn Neighborhoods & Nearby Areas
From the brownstones of Park Slope and Fort Greene to the row houses of Bay Ridge, Bensonhurst, Flatbush, and Williamsburg — plus the Queens and Long Island communities we cover every week.
See the full service areas list for every neighborhood and town we cover across New York.
Brooklyn Roofing FAQs
Straight answers to what Brooklyn homeowners ask us most about flat and low-slope roofs.
Most Brooklyn brownstones, row houses, and attached brick two- and three-families have flat or low-slope roofs hidden behind a parapet wall. That surface is typically covered with a single-ply membrane like EPDM rubber or TPO, or an older layer of modified bitumen or built-up tar. On those roofs we work with the field membrane, the parapet flashing, the cornice, and the drains as one connected system rather than the pitched, shingled roofs common out on Long Island.
Yes. Brooklyn's housing stock is mostly flat and low-slope, so a large share of our work here is single-ply membrane roofing. We install and repair EPDM rubber and heat-welded TPO, tie the membrane properly into parapet walls and drains, and detail the flashing at chimneys, skylights, and roof hatches where leaks usually start. On the pitched roofs found on some Victorians and freestanding homes in areas like Ditmas Park, we install GAF shingle systems.
Yes. Many Brooklyn blocks in Park Slope, Fort Greene, Cobble Hill, and Brooklyn Heights sit inside landmarked historic districts, where visible details like cornices and the street-facing roof line are protected. Most flat-roof membrane work happens behind the parapet and out of public view, but we plan around landmark and cornice considerations and keep the visible architecture intact.
Flat and low-slope roofs drain slowly, so water ponds and finds any weak seam. On Brooklyn row houses the usual culprits are cracked parapet flashing, failed drain and scupper details, split seams on aging EPDM or tar, and layers of old roofing stacked from decades of quick patches that trap moisture. We track the leak back to the source, strip the failed material, and rebuild the membrane and flashing so it sheds water the way it should.
We offer 24/7 emergency response for active leaks and storm damage across Brooklyn. Nor'easters, heavy snow load, and wind-driven rain hit flat roofs hard, and a ponding parapet can push water into the top floor fast. Call (631) 669-6269 any time and we will get a crew out to stop the water and protect the interior.