I started using spray foam roofing 25 years ago, with only one leak - last year. they came right out and fixed it, no problem. The company, Energy Shield, is located in Pontiac, MI. Spray foam adds a high insulation factor to your roof. If you already have 2 built up roofs on, there is no tear off, as it is light weight. It can be sprayed seamlessly right up the roofing mechanicals, and best of all, is only about $2.80 a square foot. Their web site is http://foaminsulationmichigan.com/index.html. Call me for a reference - I have more that me to tell you about.
Gary
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