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
That is a great questions, you have several options.
First, I usually recommended allowing the deck to weather for a few months. This gets rid of some of the surface chemicals used in pressure treati ... read more