This flat roof replacement was located in downtown Montgomery, AL. We removed 4" worth of old roofing material down to the steel deck substrate. Because the roof had zero pitch, we added a layer of tapered insulation over the entire roof. The tapered insulation had a 1/8" slope, with a 1/4" slope around the crickets. We then installed a .60 mil GAF EverGuard TPO membrane over the entire roof. Both the TPO and the tapered insulation ere mechanically attached.