Flat Roof vs. Shingle Roof: Pros, Cons, and Which Fits Your Brooklyn Building
In most of Brooklyn, this decision has already been made for you by your building’s construction — brownstones and row houses are built for flat roofs, detached and semi-detached homes are built for pitched shingle roofs. But if you’re renovating, adding a rear extension, or planning a full replacement, it’s worth understanding the real trade-offs.
Flat Roofs
Where they’re standard: Brownstones, row houses, and most attached multi-family buildings — anywhere the roof sits behind a parapet wall and isn’t meant to be visible or shed water by gravity alone.
Pros:
- Usable rooftop space (common on brownstones for a roof deck)
- Lower material cost per square foot than pitched systems
- Easier to add solar panels, HVAC equipment, or a bulkhead
- Fits the architectural style of pre-war attached housing
Cons:
- More dependent on proper drainage — a flat roof only works if water actually drains, not just runs off
- Shorter typical lifespan (15–25 years vs. 20–30 for shingle) depending on system
- Ponding water, if drainage is poor, accelerates membrane wear
- Requires more frequent inspection to catch small issues (blistering, seam separation) before they become leaks
Common systems: TPO (best UV/reflectivity performance), EPDM (rubber, cost-effective, proven track record), modified bitumen (traditional, strong performance, moderate cost), and older built-up roofing (BUR) still found on many pre-war buildings.
Shingle Roofs
Where they’re standard: Detached and semi-detached single-family homes, particularly in neighborhoods like Flatbush, Bay Ridge, and parts of Borough Park.
Pros:
- Longer typical lifespan (20-30 years for architectural shingle)
- Sheds water by gravity/slope, less dependent on drainage engineering
- Easier and generally cheaper to do a partial/section repair
- Wide range of colors and styles for curb appeal
Cons:
- Not usable as rooftop living space
- More vulnerable to wind damage on individual shingles during storms
- Steep pitches can mean higher labor cost for repair access
- Doesn’t fit the architectural style of attached, party-wall buildings
What About Buildings With Both?
Many Brooklyn row houses with rear additions have a pitched shingle section over the original structure and a flat roof over a rear extension — genuinely two different roof systems on one building, each needing its own maintenance and repair approach. We assess these separately during an inspection rather than treating the whole roof as one system.
Bottom Line
If you’re renovating or adding onto an existing structure, match your addition’s roof type to what performs best for that specific section’s slope and use, rather than defaulting to whatever the main house has. If you’re facing a full replacement decision on an existing flat or shingle roof, the existing system usually remains the right choice — switching roof types on an existing structure is a significant structural and cost undertaking, not a simple material swap.
Not sure which system your building actually has, or its condition? A free inspection will tell you exactly what you’re working with.