Flat VS. Low Slope Roof
When it comes to buildings and houses, there are generally two types of roofs, flat or low slope, and a steep slope roof. A flat or low slope roof is generally treated as one type of roof and requires a specialist when it comes to repairing and replacement, whereas a steep sloped roof, (that is a roof that has at least a 4/12 pitch or higher), can be repaired or replaced by a roofing generalist.
The low slope roof requires certain materials that are designed to shed water. Standard roofing shingles are good at shedding water but when it comes to the lower slopes, they tend to fail or not work at all. In most cases, shingle manufacturers will not warranty the shingles if they are installed on a lower sloped roof. 
If you have a low sloped roof, there are several options available to ensure you get a water-tight seal that will last for years to come. Function as well as look is important when it comes to your house so knowing what is available to you is important.
TPO
On a low slope roof, the biggest problem that leads to breakdown of the roofing material is ponding water. A typical asphalt installation will break down over a period of time if there is ponding water. A TPO system is not adversely affected by ponding water so it lasts much longer than a typical asphalt application. The single-ply material does require the services of a professional to install but offers long lasting protection.
Modified Bitumen
Modified Bitumen systems have all the advantages of a built-up system combined with the easy installation of a single-ply system. Bitumen is reinforced with fiberglass and formed into rolls or sheets comprised of one, two, or three layers.
This product is durable in extreme weather conditions, easy to install, and is available in rolls that when installed will expand and contract with the movement of the building. This product also resists oxidization and ultraviolet damage.
EPDM
EPDM or Ethylene Propylene Diene Monomer is a durable, high density rubber derived from oil and gas. It is a long-lasting rubber material and is available in black or white. When properly installed by a licensed contractor such as Essential Flat Roofing, it can last 30 years or more before it needs to be replaced. Combine this feature with its durability and resistance to ultraviolet light and inclement weather make it a cost-effective solution for your low sloped roof.
When making a decision about what type of material is best for your roof, it is important to have a qualified, licensed roofing specialist who is experienced with low sloped roofs. You want your roof to last a long time so having it installed and maintained properly is important.