You can by sheets of PVC roofing for not much more than the cost of rubber roofing. Very strong and only needs to be mechanically fastened instead of glued like EPDM.
About as thick as rubber roofing around .060 mil maybe thicker. Extremely durable, used for commercial roof applications where rubber won't cut it. Like high traffic areas or above restaurants that discharge animal fats through the air vents. The animal fats eat through rubber but don't touch the PVC membrane.