What this covers
Most business buildings have low-slope roofs covered in single-ply membrane such as TPO or PVC, modified bitumen, or built-up layers. The roofer inspects the field, seams, flashings, curbs, drains and parapets, and often tests for wet insulation underneath. Repairs address failed seams, punctures and flashing. Replacement removes or covers the old system, installs insulation sloped toward drains, and lays and seals new membrane, with careful detailing at every penetration and edge. A careful roofer plans access, safety and weather protection so the building stays dry and usable.
When to call
- Ponding water that stays on the roof for days after rain.
- Leaks or ceiling stains inside, especially near rooftop units or drains.
- Seams that are lifting, blistering or cracked membrane.
- Storm damage to flashing, edges or rooftop equipment curbs.
What to expect
- InspectThe membrane, seams, flashings, drains and edges are checked, and wet insulation is located.
- RecommendRepair, recover or replacement is chosen based on the condition of the system.
- InstallInsulation and membrane are installed, with seams welded or sealed and penetrations flashed.
- Close outDrains are cleared, the roof is inspected, and the work is documented.
Get a certified company
Look up a certified company by ZIP code. Every company's license, insurance and trades are verified before it is listed, and placement is never paid.
Questions people ask
Can a new membrane go over the old roof?
Sometimes. If the existing insulation is dry and the code allows another layer, a recover is possible. Wet insulation is removed first.
What causes ponding water?
Deck deflection, clogged drains or insulation that was not sloped enough. Tapered insulation and clear drains are the usual fix.
How often should a commercial roof be inspected?
Commonly twice a year and after major storms. Regular inspection catches failed seams and flashings while they are small repairs.
Related: Commercial restoration · Flat roofing · TPO roofing · All more home services
This page describes what the service involves. The company you hire sets the scope, the schedule and the price, and your contract is with that company. We verify credentials and collect reviews from real jobs. We do not guarantee any company's workmanship. Safety steps are general guidance. When in doubt, leave the home and call 911.