For the construction of commercial and industrial buildings, flat roofs are more commonly installed, as opposed to peaked or sloped roofs, for several different reasons. For starters, they are less expensive because they are easier to install, which leads to lower initial installation costs. The cost of maintaining and repairing them are generally lower, and they are longer lasting, which save money on having to replace them. They are also more easily accessible for maintenance and repair, since they are flat and easy to walk on. They are less wind resistant which reduce the chances of getting damaged during heavy wind and storms.Flat roofs are more energy efficient because there is less unused space under the roof to heat and cool. Also, flat roofs are more adaptable for green roofing initiatives.
When installing or replacing commercial flat roofing, there are different options for the choice of material, which cost will be based on. This includes size of the roof surface, the composition of the material and the installation time and method.
Flat Roofing Systems/Materials:
Built-Up Roofing: also known as traditional-tar-and-gravel roofs, this system has three alternating layers of hot tar and waterproofing, and is overlaid with a layer of stone.
Single-Ply Membranes: this roofing material is made up of synthetic rubber, and usually is installed by either an adhesive or mechanical fasteners. This type of roofing is less expensive to install than built-up roofing. Also, it has heat-reflective properties that that lower energy consumption during the summer months, and it can be installed over existing roofing. This system has puncture resistance, reinforced with polyester or fiberglass, that helps holes and other damage from occurring.
Modified Bitumen Membranes: commonly applied in rolls that have self-adhering backing. This type of roofing has an elastic quality that makes it better for resisting aging and weathering. This system also has heat-reflecting materials, and a plastic quality that has improved UV resistance and low-temperature flexibility. This system also has high resilience, which make it long-lasting and more resistant to splitting and tearing.