Inspect a commercial roof at least twice a year, ideally in spring and fall, and again after severe weather such as high winds, heavy rain or hail. NRCA recommends this schedule, and manufacturer warranties such as Carlisle’s ask for the same rhythm plus an inspection after rooftop equipment is serviced.
The useful answer is a schedule you can defend to ownership: one that protects the warranty, catches small problems before they leak onto a production line or a tenant’s ceiling, and turns roof spending into a planned budget line. Below: the schedule, a checklist, what warranties require, what inspections cost and what a maintenance program should include.
Of the 635 commercial roofing jobs OneRoof Solution has handled in California, 528 were service and repair work. Many problems start small, like a clogged drain or an open seam, and inspections find them early.
The short answer: twice a year plus after storms
Two primary sources say the same thing:
- NRCA. The National Roofing Contractors Association recommends that building owners and facility managers schedule roof maintenance inspections at least twice a year, preferably in spring and fall, with more inspections after severe weather (NRCA, Professional Roofing, April 2012).
- Carlisle’s Care and Maintenance Guide, which comes with its Golden Seal warranty, says to inspect at least every six months (preferably spring and fall), right after heavy rain, high winds or hail warnings, and after regular maintenance of any rooftop unit. It adds that roofs near tall trees may need more visits because leaves and debris block drainage (Carlisle warranty PDF).
A full inspection schedule
| Trigger | When | What to check | Who |
|---|---|---|---|
| Spring inspection | March to April, after the rains | Seams, flashings, drains, storm damage | Roofing contractor |
| Fall inspection | September to October, before the rains | Drains cleared, sealants, open seams | Roofing contractor |
| After severe weather | Within days of the event | Punctures, loose material, drains | Roofing contractor |
| After rooftop trade work (HVAC, solar, electrical) | After each visit | Punctures, debris, new penetrations | Roofing contractor (per Carlisle guidance) |
| Ongoing owner checks | Monthly or after storms | Debris, overhanging branches, ponding seen from the access point | Trained staff, following safety procedures |
The rooftop trade work trigger is the one most schedules miss. HVAC technicians, electricians and solar crews walk the roof, drop screws and cut new penetrations. If you are adding solar, plan the roof work and the panels as one project, so the roof under the array is sound before the panels go on, and get the manufacturer’s written OK for the new penetrations.
In California, the wet season sets the rhythm. We suggest a fall inspection in September or October to get drains and seams ready before the rains, and a spring inspection in March or April to find what the rain exposed.
What a commercial roof inspection should cover
A real inspection covers the whole roof, not just the spot above the ceiling stain. Use this checklist, compiled from General Roofing Co.’s checklist and NRCA guidance, to judge any inspection report you receive:
- Roof surface: cracks, punctures, blisters, worn areas, soft spots
- Seams and laps: open or lifting seams
- Flashings: at walls, parapets, curbs, skylights and penetrations
- Drains, scuppers and gutters: debris, blockages, overflow
- Ponding: where water sits and for how long
- Edge metal and copings: secure, with membrane edges intact
- Rooftop equipment and walkway pads: damage from service work and foot traffic
- Previous repairs: patches or sealant that are failing or reopening
- Inside leak signs: ceiling stains, damp smells, repeat leak areas
- Roof access safety: hatch, ladder and walking paths
- Photo records: photos, notes and repair priorities, filed for comparison next time
Two benchmarks to hold the report to: Carlisle’s guide says ponded water should evaporate within 48 to 72 hours after rain, and NRCA says conditions should be written down and photographed, then filed so the next inspection can compare. For food processing plants, add one item: Carlisle’s guide says animal fats and vegetable oils must be removed from TPO and PVC membranes regularly, so check around exhaust fans.
Why inspections protect your warranty
Most owners think of a roof warranty as automatic coverage. Read the terms. Carlisle’s Golden Seal warranty, as one example:
- 30-day leak notice. The owner must give Carlisle written notice within 30 days of any leak.
- Failure to maintain. The warranty excludes damage from the owner’s failure to use reasonable care in maintaining the roof, including the items in the Care and Maintenance Guide.
- Records. The owner must keep the warranty document, maintenance inspection logs, rooftop traffic logs, service logs and invoices for roof work.
- Unapproved additions. Alterations, repairs or rooftop additions such as equipment or solar arrays made without Carlisle’s written authorization are not covered.
NRCA adds that when a roof is under a contractor’s or manufacturer’s warranty, the contractor who installed it should do the repairs, to avoid conflicts with warranty requirements.
Terms differ by manufacturer, so check your warranty document. The pattern holds: scheduled inspections, written records and authorized repairs protect your claim. We are certified or authorized applicators for Carlisle, GAF, Duro-Last, Versico, Henry, CertainTeed and American Standard Coatings, so we can work within those warranty requirements.
What a commercial roof inspection costs
For planning, a Bay Area contractor, General Roofing Co., gives these ranges (June 2026), and notes that Bay Area pricing tends to run higher than the national average (General Roofing Co.):
- About $250 to $750 for a basic visual inspection
- About $750 to $1,500 for a standard inspection with photos and a written report
- About $1,500 to $3,000 or more for a detailed or due diligence report, and $2,000 to $4,000 or more with moisture scans or special testing
These are outside figures, not OneRoof Solution prices. We quote every roof after we see it. What moves the price on any roof:
- Roof size, height and number of buildings
- Access and safety needs
- Roof type and condition
- Report detail (visual notes or a written report with photos)
- Moisture testing such as an infrared scan or cores
- Travel time to the site
One-off inspections vs a maintenance program
A one-off inspection shows the roof today. A maintenance program adds scheduled inspections, preventive repairs, records, a plan for leaks, and capital planning so replacement is budgeted, not an emergency.
Our Rainshield Roof Care Program works this way:
- We assess your roof. A full inspection sets your baseline condition.
- We create a tailored plan. Frequency and services are matched to your building, climate and operations.
- We keep your roof storm-ready. Regular visits, proactive maintenance and early detection.
- You stay informed. After each visit you get an easy-to-understand report with photos and recommendations.
Rainshield also uses advanced scoring and infrared scans to spot issues early, keeps every detail in a secure digital roof passport, and provides capital planning reports so you can forecast roof spending. For a warranty holder, that passport is the inspection log and service record the manufacturer asks you to keep.
Questions to ask any contractor before you sign a maintenance program
- How many visits per year, and in which months?
- How fast do you respond to a leak, and is that in writing?
- Which minor repairs are included at each visit, and how is anything larger approved?
- What does the report look like, and how soon after each visit do you get it?
- How are warranty records kept, and can you get them if you change contractors?
- What is the term, and how does renewal work?
For leaks, we offer 24/7 dispatch, and we respond fast.
Signs you need an inspection now
Do not wait for the next scheduled visit if you see:
- Ceiling stains or water marks
- Repeat leaks in the same area
- Ponding that stays more than a day or two after rain
- Clogged drains or overflowing gutters
- Loose flashing or open seams
- Blisters or bubbles in the membrane
- Musty smells near the roof deck
- Recent HVAC, solar, electrical or plumbing work on the roof
Active leak? Request a leak repair.
How often should a commercial roof be replaced?
There is no single number. Roof life depends on the system, the installation and the maintenance. Use your warranty term as a planning anchor and your inspection history to know when to start budgeting. When the roof wears, our guide on commercial roof coating vs replacement explains how to decide whether a coating can extend its life or whether it is time to replace. When replacement is on the table, see what goes into commercial roof replacement cost per square foot.
FAQ
How often should a commercial roof be inspected?
At least twice a year, preferably in spring and fall, plus after severe weather. NRCA recommends this schedule, and Carlisle’s warranty guide also asks for an inspection after any rooftop unit is serviced.
What time of year is best for a commercial roof inspection?
Spring and fall. In California, we suggest September or October to get drains, seams and flashings ready before the rains, and March or April to find what the rain exposed.
Do I need an inspection after a storm even if there is no leak?
Yes. Carlisle’s guide calls for an inspection right after heavy rain, high winds or hail warnings. Carlisle notes that wind damage often starts at the roof edges.
Does skipping inspections void my roof warranty?
It can weaken your coverage. Carlisle’s warranty, for example, excludes damage from the owner’s failure to use reasonable care in maintaining the roof and requires inspection and service records. Other warranties vary, so check yours.
How much does a commercial roof inspection cost?
One Bay Area contractor puts a basic visual inspection at about $250 to $750 and a report with photos at about $750 to $1,500, with moisture scans costing more. Those are outside figures, not our prices. Price depends on size, access, report detail and testing, and we quote every roof after we see it.
What is included in a commercial roof maintenance program?
Scheduled inspections, preventive repairs, written and photo records, a plan for leaks and capital planning. Rainshield adds a baseline inspection, a tailored plan, roof scoring, infrared scans and a digital roof passport.
Can my maintenance staff inspect the roof?
Yes, within limits. NRCA says building staff with general knowledge of the roof system who follow proper safety procedures can inspect. Owner tasks include removing debris and trimming overhanging branches. Repairs beyond that should go to a professional roofing contractor.
What is an infrared roof inspection?
An infrared scan reads temperature differences across the roof to find wet insulation you cannot see from the surface. Suspect areas are then checked with core samples. Rainshield includes infrared scans as part of its early warning.
Put your roof on a schedule
Start Rainshield with a baseline inspection and a tailored plan, with photo reports after every visit. Call (855) 762-7663, or (707) 440-2351 for our Napa office, or email sales@1roofsolution.com. For a roof emergency, call our 24/7 line at (559) 697-6252.
Start with a baseline inspection
Have an active leak? Request a leak repair.