Fast diagnosis. Lasting fixes. We repair roofs across all 5 NYC boroughs — and we physically walk every job to find the real problem.
A small leak left unaddressed can turn into thousands of dollars in structural damage. Alter Phase Roofing responds quickly to identify the true source of the problem and apply a lasting fix — not a temporary patch.
Unlike contractors who quote based on photos or drones, our team physically inspects your roof — walking the surface, checking flashings, examining valleys, and finding every vulnerable spot. You get an honest assessment and a clear plan.
Every repair follows our proven 4-step process to ensure the fix is comprehensive, lasting, and fully documented.
A crew member physically walks your entire roof — not a drone, not satellite imagery. We check every surface, flashing, penetration, and seam to find all problem areas, including ones you didn't know existed.
We explain exactly what we found, in plain language. You receive a clear, itemized quote with no hidden fees. We also tell you if a repair will suffice or if replacement is the smarter investment.
Our licensed crew performs the repair using premium materials that match your existing roof system. We address the root cause — not just the visible symptom. All work meets NYC building codes.
After completing the repair, we do a final walkthrough with you, clean the job site thoroughly, and document the completed work. We follow up to confirm everything holds — especially after the first rain.
A $200 repair today can easily become a $10,000+ problem tomorrow. Water intrusion spreads fast — saturating insulation, rotting decking, growing mold, and compromising structural integrity.
Even a minor leak that appears seasonal can indicate failing underlayment, cracked flashing, or compromised decking beneath the surface. The sooner it's caught, the less it costs to fix.
We trace leaks to their true source — not just the ceiling stain, but the entry point on the roof.
Fast response after severe weather. We document damage for insurance claims and begin repairs immediately.
Most leaks originate at flashings. We reseal, replace, or repoint all chimney, vent, and valley flashings.
Cracked, missing, or wind-lifted shingles replaced with matching materials to maintain protection and appearance.
Mark climbed up himself and found three separate leak sources the previous contractor missed. Honest assessment, clean work, and the repair has held through two major storms since. Highly recommend.
Called them after a nor'easter and they came out the same day. Emergency tarping, damage assessment, and the full repair completed within the week. Could not have asked for better service.
They repaired a persistent leak around my chimney that two other contractors failed to fix. Alter Phase found improper original flashing and replaced it correctly. Dry inside for the first time in years.
Don't wait — contact us for a free inspection. We respond fast.