Hi,   Having recently had a defective flat roof replaced... per another post. I've noticed an issue with pooling water. In fairness the old roof suffered with it to some extent but less so as the outlet was made up of the membrane material. The new outlet is a single piece welded to the PVC and sits ever so slightly higher. Effectively there is a small step up to the outlet which is far from ideal. I mentioned it to the roofer and he explained that the membrane would be unaffected by t