Why commercial roofing requires a specialist — not just any roofer
Commercial and residential roofing are fundamentally different trades. Commercial roofs are larger, use different materials (TPO, EPDM, modified bitumen, built-up roofing), require different installation equipment, and carry different warranty and insurance requirements. A contractor who does excellent residential shingle work may have zero experience with a 50,000 sq ft TPO flat roof.
After Hurricane Beryl (2024) and Ian (2022), commercial property managers across the Gulf Coast reported the same pattern: residential contractors who had marketed commercial services quoted low, did poor work, voided manufacturer warranties, and were unreachable 90 days later. The questions below are designed to filter out that risk before you sign a contract.
Licensing and insurance questions (non-negotiable)
What is your state commercial contractor license number?
Every commercial roofing contractor must hold a valid state license. Ask for the number and verify it yourself at your state's licensing board website before proceeding. Don't accept "we're licensed" — get the number and check it.
Provide certificates of general liability and workers' compensation insurance.
Ask for current certificates naming your company as an additional insured on the GL policy. Verify the policy is active — call the insurer on the certificate. Workers' comp is non-negotiable: uninsured workers injured on your property become your liability.
Are you a licensed applicator for the membrane system you're proposing?
TPO, EPDM, and other single-ply membrane manufacturers require contractors to be certified applicators to install their products under warranty. A non-certified contractor can physically install the material, but the manufacturer warranty is void. Ask for the certification number and verify it with the manufacturer directly.
Experience and references questions
How many commercial roofing projects have you completed in the past 12 months?
A commercial roofing specialist should complete multiple commercial projects per year. A contractor who primarily does residential work and "occasionally" takes commercial jobs lacks the systems, equipment, and crew expertise for a complex commercial project.
Provide three references for completed commercial projects similar in size and system to mine.
Ask for references for projects of similar scope — same roof type, similar square footage. Call every reference. Ask specifically about whether the roof was installed correctly the first time, whether the contractor was responsive to issues, and whether they would hire them again.
Can I see completed projects of similar scope in this area?
Local experience matters — contractors familiar with coastal Florida's wind zones install differently than contractors from inland markets. Ask to visit a completed project in your geographic area.
Proposal and warranty questions
What manufacturer warranty will this installation carry?
Commercial membrane warranties range from 10 to 30 years depending on system and installation level. Ask specifically: what is the warranty term, what does it cover (material only vs. material + labor), and what are the conditions that void it (ponding water, improper maintenance, unauthorized repairs).
What is your workmanship warranty, and what does it cover?
The manufacturer warranty covers the material. The contractor's workmanship warranty covers installation defects. Industry standard is 2 years minimum; reputable commercial contractors offer 5 years. Get the warranty terms in writing before signing the contract.
Will this installation meet the wind uplift requirements for my location?
Coastal commercial buildings have specific wind uplift requirements based on their location, building height, and roof zone. Ask your contractor to specify which FM Global or ASCE 7 wind uplift standard their installation meets and how the fastener pattern and membrane attachment method achieve that rating.
Who are your subcontractors, and are they covered under your insurance?
Many commercial roofing contractors subcontract portions of the work. Ask who handles sheet metal work, HVAC flashing, and specialty penetrations. Verify subcontractors are covered under the prime contractor's insurance or carry their own.
Project management and communication questions
Who is my dedicated project manager and how do I reach them directly?
Ask for a name, direct phone number, and email — not a general company line. According to a 2026 commercial roofing guide from BT Roof, communication failures are one of the top sources of commercial roofing disputes. A dedicated project manager who answers calls and sends daily updates is a differentiator, not a luxury.
What is your emergency response time for active leaks during the project?
A partially completed roof is extremely vulnerable to storm damage. Ask how quickly the contractor can respond to an emergency during the project window, and what their protocol is for securing a partially completed roof if a storm is forecast.
How will you manage tenant access and building operations during the project?
Commercial roofing work creates noise, odors (from adhesives and bitumen), and debris. Ask how the contractor manages these impacts around active tenants, and whether they can schedule phased work to minimize disruption to high-traffic areas.
Insurance claim and documentation questions (storm damage work)
Have you worked directly with insurance adjusters on commercial storm claims?
Storm damage restoration is different from standard commercial roofing. Ask about the contractor's experience preparing damage assessments for insurance claims, working with adjusters during inspections, and supplementing claims when initial settlements are insufficient.
Will you document all damage in writing before beginning any repairs?
Emergency repairs that begin before damage is fully documented can create problems for your insurance claim. A reputable contractor documents all damage with a written report and photos before any repair work — even temporary emergency tarping.
🚩 Red flags that disqualify a commercial roofing contractor
Walk away if: they cannot provide a verifiable state license number; they don't carry or can't document workers' compensation insurance; they pressure you to sign a contract or Assignment of Benefits (AOB) before the insurer's adjuster has visited; they offer a price significantly below all other bids without explanation; they have no verifiable completed commercial projects in your area; or they cannot name the specific membrane manufacturer and system they are proposing.
Informational purposes only. The content on this page is general educational information about commercial roofing and property insurance — it is not legal advice, insurance advice, or a guarantee of any specific outcome. Insurance policies, lease terms, building codes, and contractor licensing requirements vary by state, carrier, and individual circumstances. Always consult a licensed insurance professional, attorney, or qualified contractor for advice specific to your situation. StormRoofQuotes is a roofing lead-generation service and is not a licensed insurer, attorney, or financial advisor.