Roofs are generally one of three different classifications: pitched, low-pitch, or flat. Of the three different roof types, a flat roof doesn’t make much sense architecturally because it inherently will not shed rain or snow. Isn’t keeping the elements off the structure a roof’s main job? Flat roofs can indeed keep a building dry, but in a different way than pitched roofs which have gravity on their side.I strongly suggest you to visit flat roof to learn more about this.
The first thing to understand when considering a flat roofing system is the different options out there for flat roofs. There are three main flat roofing systems: built up roofs, modified bitumen, and membrane roofs.
-Built Up Roofs
This is the traditional tar and gravel roof that many think of when envisioning a commercial flat roof. Basically layers of waterproof material are built up with layers of hot tar in between. On top of the built up layers is layer a rock or stone. Traditionally these built up roofs were made of layers of tar paper but newer materials such as fiberglass membranes have become available increasing roof life.
-Modified Bitumen Roofs
These roofs are system of a single ply rolled roof impregnated by a mineral-based topcoat as a wear surface. Originally a torch-down system installed by heating the adhesive, there are now also peel-and-stick torch less systems which are safer and easier to install.
Also referred to as rubber roofs, EPDM (short for ethylene propylene diene monomer) roofs are a true rubber roof. The membrane is very durable and resists both tearing and sunlight damage. Installation has many options including glue down, ballasted with stone, and anchoring with fasteners.