Finding where the leak really starts
Water enters at one point and travels along the roof deck, joists, or pipes before showing up as a ceiling stain somewhere else entirely. Chasing the stain instead of the source is why so many leak repairs fail. We methodically trace the entry point — flashing, seams, drains, parapets, or penetrations — and confirm it before repairing.
Common NYC leak sources
In NYC buildings, leaks most often come from cracked parapet walls and coping, failed flashing around vents and skylights, clogged or damaged drains, and deteriorated seams on flat membranes. On pitched roofs, it's typically flashing, valleys, and aging materials.
We address the specific cause and check for related weak points nearby that are likely to fail next.
Stopping damage before it spreads
Every day a leak goes unrepaired, water spreads into insulation, drywall, and framing, and mold can begin within a day or two of persistent moisture. Fast, correct repair keeps a minor leak from becoming a major interior renovation. We prioritize active leaks and can respond quickly.
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