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RESERVE <br />ADVISORS <br />Useful Life: Up to 25 years <br />Component Detail Notes: Built-up roofing provides a durable system due to its multi - <br />layer protection. Built-up roofs are composed of asphalt coated roofing sheets installed <br />in layers to add strength to the roofing system. Built-up roofs are an economical option <br />for flat and low -sloped roofs. <br />Contractors can install a new built-up roof in one of two ways: tear -off or an overlay. An <br />overlay is the application of a new roof membrane over an existing roof. This method, <br />although initially more economical, often covers up problems with the deck, flashing and <br />saturated insulation. The tear -off method of replacement includes removal of the existing <br />roofing, flashings and insulation, and installation of a new roofing system. <br />The contractor should follow the manufacturer's directions and specifications upon <br />installation of the roof. The contractor should remove the original insulation if saturated <br />or compacted and apply a new layer of insulation per the manufacturer's instructions. The <br />insulation should fit loosely with gaps no greater than '/4 inch. Gaps will cause failure of <br />the membrane later. Mechanical fastening of the insulation is the best manner of <br />installation. The contractor applies the base sheet of roofing over the insulation board. <br />This sheet is normally 30-pound material. The contractor should start the installation of <br />a roof membrane from the lowest points of the roof. Mechanical fastening and embedding <br />the base sheet in a flood coat of hot asphalt is the best manner of installation. Felt or <br />glass fiber plies saturated with asphalt are usually used for level or low -pitch roofs <br />because of their greater resistance to standing water. A membrane of three- or four -plies <br />is common, the more plies used, the more durable a roof. <br />Preventative Maintenance Notes: We recommend the building maintain a service and <br />inspection contract with a qualified professional and record all documentation of repairs <br />conducted. We note the following select recommended preventative maintenance <br />activities to maximize the remaining useful life: <br />• Semi-annually: <br />o Note drainage issues with water ponding after 48 hours of rainfall <br />event. Verify scuppers and drains are free of debris. Replace <br />damaged or missing drain covers. <br />o Inspect perimeter flashing for loose fasteners, deflections, and <br />sealant damage <br />o Verify membrane surface is free of ruptures or damage, and <br />areas of extensive blistering or bubbling <br />o Remove oil spills or contaminants from mechanical equipment <br />o In areas of possible foot traffic, remove any sharp debris or trash <br />and note areas of crushed insulation <br />o Ensure ballast is not displaced near roofing corners, edges and <br />near mechanical equipment <br />o If frequency of leaks increase or location of water infiltration is <br />unknown, we recommend the consideration of a thermal image <br />inspection <br />Page 4.4 - Reserve Component Detail <br />