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COMMERCIAL ROOF REPAIR

REPAIRS THAT FIX
THE CAUSE

Leaks, ponding water, failed flashing and storm damage on commercial and multifamily buildings across NYC, Westchester and Connecticut — not just the stain on the ceiling.Our own crews, our own metal shop, since 1970

56+
Years Experience
In-House
Self-Performed
MBE
NYC Certified
Prevailing
Wage
L&M Roofing crew performing commercial roof repair
Since 1970
56+ Years Experience
Prevailing Wage
Public & Private Work
MBE
Certified Contractor
NYCHA
Approved Vendor
Commercial
& Institutional
Tri-State
NY · NJ · CT Coverage

Trusted by property owners, developers, public agencies, and institutional clients throughout New York, New Jersey, and Connecticut.

Got an active leak? Call (914) 937-1030 and we will get a crew out to stabilize it, then diagnose the underlying cause properly. Our shop and crews are in Port Chester — we are not dispatching from out of the area.

REPAIR SERVICES

WHAT WE REPAIR

Every commercial roofing system we install, we also repair — and the crew doing the repair is the same crew that does the replacement

Leak Detection & Repair

Finding where water actually enters — which is rarely where it shows up inside — and sealing it permanently.

  • Thermal imaging inspection
  • Moisture mapping
  • Waterproofing treatment
  • Permanent sealing

Storm Damage Repair

Storm damage assessment and repair to secure the building and document the loss for your carrier.

  • Prompt site assessment
  • Insurance documentation
  • Structural assessment
  • Complete restoration

Flashing Repair

Flashing fails before membrane does. We replace it at penetrations, walls, curbs and edges — fabricated in our own shop.

  • Metal flashing fabrication
  • Chimney flashing
  • Skylight sealing
  • Valley repairs

Membrane Patching

Repair of TPO, EPDM, PVC and modified bitumen systems using the manufacturer-approved method for each.

  • Hot-air welding
  • Adhesive bonding
  • Patch reinforcement
  • Seam repair

Structural Repairs

Deck, joist and substrate repair where water has been getting in long enough to reach the structure.

  • Deck replacement
  • Joist reinforcement
  • Substrate repair
  • Load assessment

Maintenance & Prevention

Scheduled maintenance that catches small failures while they are still small — usually the cheaper spend.

  • Annual inspections
  • Drain cleaning
  • Coating application
  • Minor repairs
DIAGNOSIS

WHAT USUALLY GOES WRONG

Six failures account for most of the commercial roof repair calls we take, and each has a correct fix

Ponding Water

Act now

Improve drainage with tapered insulation or additional drains

Blistering

Plan it

Cut out and patch affected areas, improve ventilation

Cracking

Act now

Seal with the appropriate sealant or replace damaged sections

Punctures

Plan it

Clean, patch and seal using manufacturer-approved methods

Shrinkage

Plan it

Release stress and add reinforcement patches

Loose Fasteners

Monitor

Remove and replace with the correct fastening pattern

OUR PROCESS

HOW A REPAIR RUNS

1

Call or Request Service

Reach our team and we will schedule an assessment.

2

Thorough Inspection

Complete assessment with photographs and a written report.

3

Repair Proposal

Line-item pricing and a documented scope of work.

4

Expert Repair

Executed by our own crews, not a subcontractor.

5

Quality Assurance

Final inspection and warranty documentation.

COMMON QUESTIONS

ROOF REPAIR QUESTIONS

How much does commercial roof repair cost?

Commercial roof repair costs vary widely based on damage extent. Minor repairs like patching or sealing typically cost $300-$1,000. More extensive repairs such as membrane sections or flashing replacement range from $1,000-$5,000. We provide a building assessment and a detailed estimate.

Do you handle urgent roof leaks?

Yes. We take urgent repair calls for active leaks and storm damage across NYC, Westchester, and Connecticut. Call (914) 937-1030 and we will get a crew out to stabilize the situation, then diagnose the underlying cause properly. Our shop and crews are based in Port Chester, so we are not dispatching from out of the area.

How do I know if my roof needs repair or replacement?

If your roof has less than 25% damage and is under 20 years old, repair is often the best option. Signs that indicate repair: isolated leaks, minor ponding, small punctures. Signs indicating replacement: widespread membrane failure, multiple leaks, sagging deck, age over 25 years.

What causes commercial roof leaks?

Common causes of commercial roof leaks include: deteriorated flashing around penetrations, failed seams in membrane roofs, clogged drains causing ponding water, HVAC equipment damage, foot traffic damage, and age-related membrane breakdown. Regular maintenance prevents most leaks.

How quickly can you repair my roof?

We prioritize active leaks, so the first visit is usually about stopping water from getting in. Permanent repairs typically take one to three days on site depending on materials and weather. Scheduling depends on crew availability — call and we will tell you honestly when we can be there.

Have a Commercial Project?

Tell us about the building, project scope or upcoming bid

Active leak? Call (914) 937-1030 — don't fill in a form. For anything else, the quick inquiry form gets a reply within 24 hours.

MBE Certified
56+ Years Experience
NYCHA Approved
Office
140 Highland Street, Port Chester, NY 10573
Hours
Monday–Friday, 7:00am–6:00pm

Quick inquiry

Or call (914) 937-1030