Commercial Roofing – Issues To Look Out For Most commercial buildings have flat roofs. Although found in some residential homes, flat roofs remain more common among commercial establishments. There’s a good and economical reason for this. As opposed to a sloped roof, flat roofs optimize the space on a building, allowing the roof to be utilized for other purposes. However, flat roofs come with some disadvantages. Roof repair on flat roofs is also different given how the roof is installed and the materials used for construction. Here are the common issues tied to flat roofs: Water can stagnate on the roof The primary reason for a sloped roof on houses is to allow water to flow freely. However, it’s not the same with a flat roof.