A commercial roof repair fixes a specific failure without replacing the whole roof. Done well, it restores the roof to watertight condition and buys years of service. Done poorly, it hides a problem that keeps spreading underneath.
Common repairs by roof type
| Roof type | Typical repairs |
|---|---|
| TPO and PVC | Re welding open seams, patching punctures, resealing flashing laps |
| EPDM | Reseaming with tape, patching shrinkage at edges, fixing flashing pull away |
| Modified bitumen | Patching blisters and splits, re adhering lifted laps |
| Built up | Repairing blisters, replacing gravel, patching ply splits |
| Metal | Replacing fasteners and washers, sealing seams, treating rust |
A good repair visit
- The crew finds the source, which is often far from the stain inside.
- They check how far water has traveled, sometimes with a moisture meter.
- They repair with materials compatible with the existing roof.
- They photograph the work and explain the cause.
Repair or something bigger
Repairs make sense when damage is isolated. When leaks appear in several places, or the membrane is brittle across the field, the money may be better spent on restoration or replacement. Regular maintenance reduces how often repairs are needed at all.
Leaking right now? See our guide to finding and fixing roof leaks.
Common questions
Can a commercial roof be patched?
Yes, when damage is isolated and the insulation underneath is dry. Patches must match the membrane type and be installed to the manufacturer's method to keep any warranty intact.
How do I know if a repair will last?
Ask what caused the damage. A repair that fixes the cause, such as poor drainage or a failed flashing detail, lasts far longer than one that only covers the symptom.