Coating estimates may use different assumptions about roof area, vertical surfaces, penetrations, and waste. A price comparison is unreliable when the measured scope differs. The same building can produce different totals for legitimate or omitted reasons.
What to do next
Ask for a marked roof plan and a description of included surfaces. Compare parapets, curbs, and special details separately. Resolve area differences before comparing unit prices so the decision reflects equivalent work.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.