What causes a Flat Roof and how to solve it?

https://www.constructioncost.co/causes-a-flat-roof.html

Flat roofs are a popular roofing option for many households, as they provide a low cost and low maintenance roofing option. Unfortunately, flat roofs can be prone to damage, ranging from leaks to sagging. If you are in need of flat roof repair, it is important to know what to look for and how to best address the problem. It protects the interior of a building or structure from heat, water, snow, and other weather elements. Flat roofs have a pitch of approximately ten degrees or less.