You will easily find flat roofs all over the world and each area will have its own preference or tradition for the materials used. In locations that the roof could become covered by rain or are at risk of water seeping into the brickwork where it could freeze, flat roofs are not as suitable. Modern materials have found a way around this hence the use of GRP as we discussed previously. However, in warmer climates, where conditions tend to be hot and dry, these flat roofs are simply built from concrete or masonry. These are cheap options and are also good at keeping the heat of the sun from the building. You will usually find these styles throughout the history of Egyptian, Arabian, and Persian architecture. In warmer climates flat roofs tend to be more reinforced and used as additional living space or even converted to a roof terrace garden.