Hard to tell for sure without a close look, but the roofing / waterproofing material looks like TPO, a single-ply roofing membrance. It is not made for direct traffic, so appears someone has installe ... read more
Not much info here to make a determination. Drainage issues can be tricky. Depends on what the builder was engaged to do (was the contract specific about installation of a certain system, or was it ... read more