There are many commercial roofing contractors out there and you want to be sure you are working with one that is qualified and knowledgeable. Ensure they have a good reputation in the industry. Be sure to also understand which manufacturer’s material are they licensed to install? There are many different materials out there and they are tiered. Top commercial roofing material manufacturers are Firestone, GAF, Carlisle, Johns-Manville, Sika-Sarnafil, Garland and Dow. How many of these is your commercial roofing contractor licensed to install and repair? Ask for a reference list. A good contractor will have a good reference list of companies they have worked for and should be willing to share that information. Contractors are always proud of the work that they do. Look on a company’s website and find pictures of projects they have completed. Your roofing contractor should also be in professional associations. Professional associations give contractors access to updated safety trainings, industry updates and standards, awards and recognition.