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2. Large blisters on existing roo� systems shall be cut and patched to provide a <br /> reasonably level substrate surface. � <br /> 3. Gravel aver existing nailers must be totally removed prior to installing new nailers <br /> and flashings. Verify that the existing nailers are securely anchored to the roaf <br /> decks. ' <br /> 4. When an additional thickness of insulation is being added, new nailers must be <br /> added to match the height aF the new insulation. Nailers must be securely <br /> anchored to the roaf dedc per Sedion 3.05 � this specification. <br /> 5. All roof surtaces shall be free of ponded water, ice, or snow and drain prope�ly. <br /> Drainage is the responsibility of the ro�ing contrador and designedspecifier. <br /> 6. Specifier and roofiing cor�trador shall detem�ine the condition of the existing roof <br /> deck and roofing. Areas with deteriorated decking or wet insulation or dher <br /> materials shall have those affected materials remaved and replaced. <br /> 7_ When removing an existing roof during reroofing, remove only that amount of <br /> roofing and flashing that can be made watertight with new Mule-Hide PVC <br /> materials in a one-day period or prior to the onset of indement weather. <br /> 3.04 Vapor Retarder Installation (where specified) <br /> General <br /> Speafic climatic and job conditions may require the use aF a vapor retarder. It is the sole responsibility af <br /> the design professional to determine the need for a vapor retarder, its type and location in the roofing <br /> system. A vapor retarder may aften ad as an "air barrier" which rnay have a positive effect in reduang <br /> intemal air �.xessure. Air barriers should be strongly considered for buildings subject to high intemal air <br /> pressures such as airplane hangars and buildings with many loading bays such as warehouse faalities. <br /> The National Roofing Contrador's Association recommends the installation af vapor retarders when <br /> intericx relative humidity is 45% or greater and the outside mean average January temperature is below <br /> 40°F. <br /> Contact Mule-Hide Customer Service Departmentfor qusstions regarding compatibility with Mule-Hide <br /> products. <br /> 3.05 Wood Nailers <br /> A. Install nailers at the perimeter of the roof and around all roo�F penetrations and projections <br /> {unless othervuise shown on Mule-Hide standard d�ails). <br /> 8. Nailers shall be firmly anchored to the decks at a ma�cimum 2'-0" o.c. and shall resist a <br /> pulloutferce of 200 IbsJlinearfoot in any direction. A 1/2" vent space shall be provided <br /> between adjacent lengths ofi nailers. Fasteners shall be installed within 6 inches of each <br /> end. Spacing and fastener embedmerrt shall cor�form to Factory Mutual Loss Prevention <br /> Data She� 1-49 or local building code requirements. <br /> C. Height af nailers shall match the surface level of the insulation and roof inembrane. <br /> D. All w�oodwork to be reused shall resist a minimum force pf 200-Ibs./linear foot in any <br /> direction and shall be free of rot. <br /> 3.061nsulation Installation <br /> A. Mule-Hide accepted roaF insulations shall be installed in accordance with Mule-Hide <br /> spec�cations or the insula6on manufacturer's requirements whichever is more stringent. <br /> 10 <br /> � <br />