Can I install Tuftex PVC corrugated roofing panels over an existing tar papered flat roof?
Yes, you can. The Tuftex PVC corrugated brings you many advantages over tar papered flat roof. Its corrugated design enables it to be both lightweight and strong and makes it a superior roofing as well as siding material.
Yes... We have recently done that to a building we own. We did, however, give it a very slight gabled appearance and the water runs off nicely into a trough on two sides.
I like ReallyNow's answer. Making even a slight pitch prevents a lot of problems that you have with a flat roof (ice, snow accumulation), which will eventually cause leaks.