Hello! I currently have a concrete roofed garage covered with epdm that is leaking through the roof and into the garage (seam and corner failure from previous installer). It hasn't been much, but it has made it all the way through. There is a deck on top of the garage (that sits on parapet walls) that we have removed and are going to replace the roof. I have a couple questions about preparation and materials when we replace the roof. (a deck is going back on top, so It wouldn't be completely accessible after the deck is back on). 1. Should we put anything on the concrete to fill any gaps, coat, protect, etc? 2. What is the best material to use for the new roof? I've had a few folks come in to give estimates some folks have suggested epdm again, some have suggested tpo. They will both be going on top of plywood and insulation... so wasn't sure if it made a difference. Many thanks!!