Originally Posted by oldog/newtrick
In any case the failure is not the membranes but the installers ability to seam the sheets or flash the penetrations properly.
I have done a modified Bitumen torch down with white granules and as oldog said its not a 'rubber' roof. No edpm or rubber roof that I know of would have white granules.
Regardless - either, and other products, could be used with success on a flat roof when installed correctly. The problem is not with the product used but in the capabilities of the installer.