Felt is one of the most popular used materials for flat roofing. It is typically used for sheds, garages, flat roof extensions as well as flat roof Dormers.
Felt roofing is lightweight. It is also relatively inexpensive and if installed well can out live the 10 year guarantee. This would be the better option if your budget is very tight.
EPDM – Single Ply Roofing
EPDM is an extremely durable, synthetic, low maintenance rubber roofing membrane that looks good. The two primary materials Ethylene and Propylene are derived from oil and natural gas.
EPDM is very lightweight, therefor the roof deck does not need reinforcement. EPDM also has very few seems, so leaks are rare. The roofing material is available in black or white and is highly weather resistant.
Rubber roof coatings also prevent harmful rays such as infrared, radiation and UV Rays and when properly installed can last for 50 years or more.