Pounding on the roof, damaged roofing materials, and material ridging are three common problems that can affect the durability of a flat roof, So you need first step regular roof inspection and after inspection process, you need to look for signs of Pounding, damage, and ridging that show your roof is in need of maintenance. For more info: https://bit.ly/2P2zTIE Contact with us: Email: [email protected] Phone: (716) 715-0756