Existing TPO roof to remain in place. Remove and replace all wet, bridged, or damaged insulation with new InsulBase polyiso insulation (20 psi), installed flush with the existing roof per manufacturer’s specifications. Provide square foot unit cost adders for insulation and plates/fasteners replacement. Ensure roof surface is dry prior to new installation. Remove all walk-pads and debris. Perforate existing roof every 100 sq. ft. with a minimum ¾” hole to prevent moisture entrapment. Adhere Carlisle .115 Sure-Weld FleeceBack TPO white membrane directly to the existing roof using Flexible FAST Adhesive applied in 6” O.C. ribbons, or splatter pattern coverage (minimum 50% substrate coverage). Parapet flashings and counter flashings to remain in place. Remove existing flashings and counter-flashing metal at all curbs and penetrations. Flash all curbs with .060 Sure-Weld reinforced TPO membrane and flash all other penetrations per manufacturer’s requirements. Install new 24-gauge Kynar-coated steel counter flashing behind existing counter flashing at parapets, and around all HVAC/curbs to terminate vertical flashings. Installations must meet manufacturer’s 20-year warranty requirements. Install Carlisle walk-pads as follows: 3’ x 10’ sections at service sides of HVAC units 3’ x 3’ sections at door landings and units requiring monthly maintenance Install 4” retrofit roof drain kits. Install new pressure-treated wood blocking under all condensate and gas lines. All sleepers and blocking must have TPO slip sheets underneath. Report any areas of damaged EIFS to the building owner prior to work. Contractor is responsible for all safety measures, roof access, receiving/delivery of materials, equipment, hoisting, dumpsters, daily trash removal, and final cleanup. Responsibility for interior protection to be coordinated between contractor and building owner. Substitutions will be allowed. It is the contractor’s responsibility to provide documentation demonstrating that any proposed substitute product is comparable to the specified brand.
