A flat roof is designed to allow water and debris to move freely from off of your roof. Originally, flat roofs were mostly formed in warm weather climates with little precipitation, made up of tar and gravel. In colder climates this method is not ideal, for the simple reason that snow and ice dams prevent the flow of water.
Flat roofing technology has come a long way in the last 20 years. Nowadays, specially designed materials and membranes are used in flat roofing systems. These new systems were designed to waterproof the designated area. The most commonly used system is called a Modified Bitumen (2 PLY). Another popular system is Single Ply (EPDM), (PVC) and (TPO).
With the help of sealants and adhesives, these membranes are applied to the top of the roof as a continuous sheet. What makes these roofing products great is their ability to bond multiple sheets while reinforcing the parts where it penetrates the roof surface.
Each system is different and has it’s own pros and cons. We recommend researching each material thoroughly before deciding on which system is right for your building structure.