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There are many different types of Commercial roofing, below are the most used ones.
 
EPDM

EPDM has been in use on roofs in the USA since the 1960's and is one of the most common types of low-slope roofing materials. It is  fairly clean to work with when compared to conventional built-up roofs. There aren't the odors and fumes that accompany built-up roofs which appeals to many property owners and managers. EPDM is a rubber material whose principal components consist of the compounds ethylene and propylene. A flexible rubber matrix forms when a small amount of diene is added to the mix. EPDM is available reinforced or unreinforced with both commonly used; it's also available in either a cured (vulcanized) or uncured (non-vulcanized) state. Vulcanized EPDM is the most common with non-vulcanized often used for flashing purposes.

TPO

TPOs are relatively new materials and they have been heralded because of their numerous advantages over other materials. In fact, they offer the benefits of both EPDM and PVC, without sharing their drawbacks. Theoretically TPOs are naturally UV and heat resistant while also remaining heat-weldable as they age. Additionally, TPOs are resistant to a wide variety of chemicals, are environmentally friendly and recyclable. On the other hand the longer TPOs are in the real world of environmental exposure the more they are purported to be showing the typical signs of surface degradation, IE: the loss of millage and sheet shrinkage, both of which are very normal for a roofing material.

Standing Seam  Pic 

Metal roofing's attributes are impressive. Durable and long lasting, a metal roof requires little maintenance, can be retrofitted over many existing, is available in a wide range of colors and styles, and is fire resistant. A standing seam roof is constructed of many interlocking panels that run vertically from the roof's ridge  to the eave. The interlocking seam where two panels join together is raised above the roof's flat surface, allowing water to run off without seeping between panel. Standing seam roofs can easily last the life of a home or Commercial building.

 
 
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