Specifications include, but are not limited to: Remove the existing single ply roof membrane system down to the top layer of existing mechanically attached insulation. Mechanically attached laps in the existing single ply membrane may be left in place if acceptable to the new roof membrane system manufacturer for the specified warranty. Existing insulation is to remain except as follows; 1. Inspect insulation, replace wet, damaged, or otherwise defective insulation including existing fasteners in replacement area. 2. At four existing abandoned HVAC supports and curbs in screenwall area, remove existing supports, curbs, and infill materials; install new structural decking in openings and install new roof system, as specified, with new infill insulation to match existing.