Two proposals can both say “clean and coat” while describing very different work. Before comparing totals, check whether each one is based on documented roof conditions, a defined repair plan and the requirements for the specific coating system. The goal is to understand what the contractor observed, what the proposal includes and what remains outside its scope.
1. Ask what roof assembly was inspected
The quote should name the existing roof type and identify the areas the contractor examined: field membrane or metal panels, seams, edges, penetrations, curbs and drainage details. Ask for a marked plan and photos showing both sound areas and deficiencies. If the proposal is based only on a visual estimate from the ground, ask what further inspection is needed before the system is selected.
Ask the contractor to distinguish observed conditions from assumptions. That makes it easier to see whether a leak, damaged panel, failed flashing or inaccessible area is included in the price or still needs investigation.
2. Get moisture and drainage findings in writing
Ask how the contractor checked for moisture in the roof assembly and whether a moisture survey is recommended by the proposed system or required by the requested manufacturer guarantee. Request the method, the results and a map of any areas that need opening or repair. The survey method and thresholds can vary by roof assembly and product program, so avoid treating a single number as a rule for every roof.
Ask whether water is draining as intended, where it collects and what will be done about any drainage issue before coating. A coating proposal should explain how active leaks, wet materials or damaged substrate are handled; a surface application does not replace an investigation of conditions underneath it.
3. Confirm system compatibility and testing
Ask for the coating manufacturer, product names, intended roof substrate and written system instructions. Find out whether the specified system calls for a test patch or adhesion check, whether a primer is required and who will record the result. Ask for the test location and outcome before approving full installation.
For example, GAF’s liquid-applied roofing manual calls for compatibility and adhesion checks where questions arise, requires clean and dry substrates, and ties moisture-survey requirements to particular guarantee programs. Those are GAF-specific instructions, not a universal specification. The proposal should point to the requirements for the system it actually names.
4. Make preparation and repairs explicit
Look for a line-by-line description of cleaning, substrate preparation, repairs, seam or detail reinforcement, primer, coating layers and application quantities. Ask who will address damaged fasteners or panels, open seams, failed flashing, penetrations, wet insulation and debris. Confirm that repair materials are compatible with the existing roof and with the planned system.
If the quote says repairs are “as needed,” ask what is included, how extra work is priced and what happens if inspection uncovers a condition that changes the scope. A clear allowance or approval step can prevent a surprise change order from becoming a rushed field decision.
5. Compare access, schedule and weather assumptions
Ask when the crew expects to work, what building access they need, how rooftop equipment and adjacent surfaces will be protected, and what conditions would pause application. Confirm how the contractor will coordinate around deliveries, tenant activity or production schedules. Weather and substrate conditions affect when a system can be installed; the manufacturer’s current instructions should govern the work.
6. Put closeout and warranty terms on paper
Before approving, request the written warranty or guarantee proposed for the job, including who issues it, what it covers, its term, exclusions, inspection requirements and maintenance obligations. Ask what closeout records you will receive: product data, repair photos, test results, application records and a final roof map.
A useful coating proposal lets you compare inspection evidence, repair scope, system details and written terms side by side. If the roof is wet, structurally compromised or needs extensive repairs, ask whether restoration remains suitable or whether another option should be assessed. Read Meadow Springs’ commercial roof-coating service details or replacement information as you compare options.
Technical reference
- GAF Liquid-Applied Roofing Manual, Version 2.2 — use the current instructions for the system named in a proposal.