The answer to 'what is flat roof' is a type of roof that has a minimal slope or is completely level. Flat roofs are commonly used on commercial buildings, but they can also be found on some residential homes. Unlike sloped roofs, flat roofs have a horizontal surface that does not allow water to drain as easily, so they require special materials and installation techniques to prevent leaks and water damage.
Flat roofs are typically constructed with a water-resistant membrane, such as modified bitumen or a single-ply membrane, that is applied over a structural deck. The roof may also have additional layers, such as insulation, to improve energy efficiency and protect the building from the elements. Proper maintenance and regular inspections are essential for keeping a flat roof in good condition and preventing issues like ponding water, which can lead to leaks and other problems.