What are the most common roofing problems?

If you own a home or manage a building in Kings County, you know that our weather is anything but predictable. From Nor’easters to summer heatwaves, roofing in Brooklyn takes a beating year-round.

Identifying issues early can be the difference between a quick patch and a massive renovation bill. Here are the most common roofing problems that Brooklyn property owners face.

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1. Ponding Water (The Flat Roof Foe)

Because so many Brooklyn buildings—from Park Slope brownstones to Williamsburgh warehouses—have flat roofs, ponding water is the #1 enemy.

• The Issue: Water that sits on a roof for more than 48 hours without draining or evaporating.

• The Cause: Clogged drains, debris buildup, or structural settling that creates “dips” in the roof surface.

• The Risk: The weight of the water can stress the building’s structure, and eventually, the moisture eats through the roofing membrane.

2. Damaged or “Alligatored” Membranes

In the summer, Brooklyn roofs bake under the sun. This intense UV exposure causes bitumen and asphalt-based roofs to lose their elasticity.

• The Issue: “Alligatoring,” where the roof surface cracks and looks like reptile skin.

• The Cause: Age and constant expansion/contraction due to NYC’s extreme temperature swings.

• The Risk: Once the surface is cracked, water can seep into the insulation below, leading to hidden rot and mold.

3. Flashing Failures

Flashing is the thin metal material used to direct water away from critical areas like chimneys, skylights, and where the roof meets a parapet wall.

• The Issue: Gaps, rust, or peeling sealant around roof penetrations.

• The Cause: High winds (common near the Brooklyn waterfront) or poor initial installation.

• The Risk: This is the most common source of “mystery leaks” that appear on your top-floor ceilings.

4. Shingle Damage (Wind and Age)

For the sloped roofs found in neighborhoods like Midwood or Dyker Heights, shingles are the primary concern.

• The Issue: Curling, cracking, or missing shingles.

• The Cause: Heavy winds and the natural shedding of protective granules over time.

• The Risk: A single missing shingle can expose the wooden “decking” of your roof to rain, leading to rapid wood rot.

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Don’t Wait for the Drip

Most roofing in Brooklyn fails not because of one big storm, but because of small problems that were ignored. If you see water stains on your ceiling or “sand” (granules) in your gutters, it’s time for a professional look.

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