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Do as Douglas said. Install insulation board and have heavy membrane rubber installed.
Commercial roof are done in this fashion and to re leave the added heat from the black rubber, round river stone is added.
I have over forty years experience in residential const - the first twenty years as a roofing contractor. The foam is better at hiding and diverting leaks than it is at preventing them.
Link - http://www.wpbf.com/news/28528121/detail.htm...
Spray foam (SPF) is very much a specialty roofing system, which we do not install, but I have a friend who is now retired and made the application of spray foam his career. Alot of his knowledge has rubbed off on me, but he has forgotten more than I ever want to know. What I do know, what I
If you want the very best roofing system look into PVC, similar to the TPO previously mentioned but with a much better track record. If you want a roof with slightly less upfront investment look into the TPO. http://reliableamerican.us/services/low-slop...
However there is more to the roof than just the membrane. I can take the worlds best roofing membrane and if I install it wrong, or incomplete, this membrane is utterly useless. Addressing all the proper details is what matters most in low slope roofing. Faster and Easier is seldom ever Better.
A cover board or insulation board of some kind is an absolute must. Keep in mind my recommendation for insulation would be based upon what you have now (a cold deck or warm deck design http://reliableamerican.us/articles/warm-dec... ). Then all the necessary flashing details including possible termination bar or counter flashings, all edge metal, drainage, pitch pans, etc... would be really what determines how long the roof will last.