Flat roofing, as its name implies, is a type of roofing that appears to be completely flat but has a very minimal slope for water run-off. It is a common, cost-effective solution employed in commercial roofing systems, such as those found in schools. The use of flat roofing for schools provides several advantages, allowing for additional space utilization and reducing construction costs.
A common material used in flat roofs is bitumen, a black, sticky material used as a binder mixed with aggregate to create asphalt. Two types of bitumen, known as APP (Atactic Polypropylene) and SBS (Styrene Butadiene Styrene), dominate the flat roof industry. The primary difference lies in the method of installation: APP modified bitumen is often heat-welded, while SBS can be fully adhered, mechanically attached or heat-welded.
There is also a modified vapor protector, which is a fire-rated cap sheet typically used in commercial flat roofing. Lastly, premium heavy duty composite elements like cover boards are used to add an extra layer of puncture resistance to your flat roof system.