On Oct 17, 8:07 am, trav wrote:
Useful Tips on Roof Insulation
Of all the insulating materials on the market today, polyurethane foam
roof insulation has one of the highest R values. It is also very
strong, rigid and convenient to have installed. With energy costs on
the rise, now is the time to take a closer look at foam roof
insulation. If you are worried that foam roof insulation will leave
your home looking like an igloo or different in any way, you have
absolutely nothing to worry about, because a building that is
insulated with foam roof insulation looks no different from any other
building.
(continued athttp://roofing-tips.blogspot.com/2007/10/useful-tips-on-roof-insulati...
)

Do you mean a flat roof with foam sprayed on the exterior. About how
much is R35 per sq ft