Commercial flat roofing is not always difficult to repair as long as you use a reputable commercial roofing installation contractor who is an expert in flat roofs. A damaged roof will need to be assessed for safety reasons and to check if it can be repaired or if it needs to be completely replaced. Sometimes the Ethylene Propylene Diene Monomer (EPDM roofing) which is used a lot for commercial flat roofing will need to be completely replaced as its very difficult to effectively repair.