Red Flags When Hiring a Flat Roof Contractor in Michigan
The most expensive flat roof mistake a commercial property manager makes is hiring a contractor based on price alone. Seven warning signs consistently show up before a bad flat roof project -- and every one of them is visible before you sign.
Grand Haven, MI | Flat Roof Waterproofing Solutions | Updated 2026-10-15
Seven red flags to watch for before you sign
No written inspection report before quoting
A contractor who quotes without first inspecting the membrane and surveying the insulation is guessing. A number without a moisture survey is not a real quote -- it is a starting price for a project that will change once work begins and surprises are found. Require a written report before any proposal.
Verbal warranty, no manufacturer documentation
A contractor warranty is only as durable as the contractor's business. A manufacturer-backed NDL (No Dollar Limit) warranty covers you regardless of the contractor's status. If the contractor cannot produce the manufacturer warranty form before work begins, the warranty does not exist in any meaningful sense.
Cannot name the manufacturer or show applicator authorization
Fluid-applied membrane systems carry warranties only when installed by authorized applicators. An unauthorized applicator installs the same product at a lower price by skipping the manufacturer's inspection and certification requirements -- and none of it is warranted. Ask for the manufacturer name and authorization documentation. Call the manufacturer to verify.
Same system specification for every building
Silicone, acrylic, and polyurethane systems are not interchangeable. The right system depends on drainage, existing membrane type, thermal cycling, and ponding risk. A contractor who recommends the same product for every building is specifying what they sell, not what your roof needs.
Unusually short project timeline
Fluid-applied membrane systems require drying time between coats, and preparation time to properly repair seams, penetrations, and flashings. A 20,000 sq ft restoration that a contractor promises to complete in three to five days is almost certainly a thin, unprepared application -- which will fail within two to three years regardless of what the warranty says.
No certificate of insurance or license
Michigan requires a roofing contractor license and general liability and workers' compensation coverage. Ask for the certificate of insurance naming your property as additionally insured, and verify the license with the Michigan Department of Licensing and Regulatory Affairs (LARA). An unlicensed, uninsured contractor leaves your property exposed.
Large upfront deposit before work begins
A deposit of more than 30 percent before material delivery is a warning sign. Legitimate restoration contractors fund the project from materials delivery forward. Contractors who require large upfront payments sometimes disappear after the first payment, leaving property owners with no recourse and no work done.
What Flat Roof Waterproofing Solutions does instead
Every Flat Roof Waterproofing Solutions project begins with a written inspection report including moisture survey results. We are an authorized applicator for the systems we install, and all qualifying projects carry a manufacturer-backed warranty stated in writing before work begins. We are licensed and insured in Michigan and serve commercial and industrial properties across Grand Haven, Muskegon, Holland, Spring Lake, and the wider West Michigan Lakeshore.
Request a Written InspectionFrequently asked questions
How do I verify a contractor's Michigan roofing license?
Check the Michigan Department of Licensing and Regulatory Affairs (LARA) online license verification tool at michigan.gov/lara. Search by business name or license number. A licensed contractor will have a valid current license on file.
What is a reasonable deposit for a commercial flat roof project?
Most legitimate commercial roofing contractors request 20 to 30 percent at contract signing to cover initial material orders. The balance is typically paid in progress draws tied to project milestones and a final payment at completion. Avoid any arrangement requiring more than 30 percent upfront before materials are delivered.
What should a flat roof inspection report include?
A legitimate pre-project inspection report includes: moisture survey results by section (infrared or nuclear gauge), membrane condition rating with photographs, drain and flashing condition, identified repair areas and scope, and a written recommendation for restoration vs. replacement with rationale.
Request a Roof Assessment
Flat Roof Waterproofing Solutions serves commercial properties across Grand Haven, Muskegon, Holland, Spring Lake, and the wider West Michigan Lakeshore. Written inspection report on every roof.