Torch Applied Membrane at Flat Roof Top by admin | Jul 13, 2015 | Torch On Membrane Waterproofing System, waterproofing system | 0 comments 1. Existing site ponded with water 2. patching the cracks and leveled the water ponding area 3. Applying the 1st layer of waterproofing (primer) 4. Torch applied waterproofing membrane 5. Waterproofing work done!