4d supp
Item No.: 4d_Supp Date: September 13, 2016 Terminal 91 Building C-173 Roof Overlay Building C-173 Roof Overlay Building C-173 Existing C-173 Roof Approximately 29 Years Old 2 Existing Roof Elements Abandoned mechanical unit Underside of abandoned mechanical unit Existing Roof Top Mechanical Elements 3 Existing Deteriorated Roof Elements Underside rusted canopy area Hole previously repaired with coating Hole previously repaired with coating Rusted underside of roof panel Previous repair of metal roof at rusted location Mechanical room penetrations Existing Deteriorated Roof Elements 4 Incorporate Sustainable Elements Increase Insulation Value Utilize Reflective Overlay Material Recycling of Demolished Materials Durable Roof System that can last 30 years as specified The project will also consider: Bio filtration units at the downspouts Sustainable Elements 5 Project Alternatives Considered Alternatives Description Cost Implications [Solar] Alternative 1 Maintain Status Quo. $9.8K Continue to pay maintenance cost. (Approximately $9.8K/yr) Alternative 2 Coat Roof with roll-on Coating System (10 year life) $2.34M Add Fall protection and Security ladders Alternative 3 Replace Roof with PVC membrane (30 year life) $1.56M Add Fall protection and Security ladders [$944K] Install Thin Film solar panels Alternative 4 Replace Roof with PVC membrane (30 year life) $1.56M Add Fall protection and Security ladders This is the recommended alternative Project Alternatives 6 Next Steps Complete Design 4th Quarter 2016 Request Construction Authorization 1st Quarter 2017 Construction Starts 2nd Quarter 2017 Construction Complete 4th Quarter 2017 Roof Overlay Project Schedule 7
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