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Flat Roof Repair in NYC: Common Problems and When to Replace

Practical advice on NYC building rules, repairs and renovations from Golden Stone Construction Inc., licensed general contractors serving all five boroughs.

Roofer installing torch-down membrane on a flat roof

Most row houses, brownstones and apartment buildings in New York City have flat or low-slope roofs. They work well when maintained, but because water does not run off as quickly, small problems turn into leaks fast.

Common flat roof problems

  • Ponding water that sits for days after rain and wears the roofing out
  • Blisters and cracks in the roofing material from sun and temperature swings
  • Failed flashing around parapets, chimneys, skylights, vents and bulkheads, which is the most common source of leaks
  • Clogged drains and scuppers that back water up
  • Damaged parapet walls and coping that let water into the top of the wall

Repair or replace?

A repair usually makes sense when the roof is in good condition overall and the leak comes from one area, often flashing or a single damaged spot.

A replacement is usually the better investment when:

  • Leaks keep coming back in different places
  • The roof has several layers or widespread blistering and cracking
  • The insulation underneath is soaked
  • The roof is near the end of its life

Do not ignore small leaks

Water from a roof leak can travel along joists before it shows up on a ceiling, so by the time you see a stain the damage is often bigger. Having the roof checked once a year, and after major storms, catches problems while they are still small repairs.

Learn more about our flat roof repair, roof leak repair and roof replacement services.

Have a roof leak? Call Golden Stone Construction Inc. at (718) 313-8233 or request a free estimate. We are licensed (NYC Home Improvement Contractor License #2106387-DCA), fully insured and serve all five boroughs.