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2. Large blisters on existing roof systems shall be cut and patched to provide a <br /> reasonably level substrate surface. <br /> 3. Gravel over existing milers must be totally removed prior to installing new nailers <br /> and fleshings. Verify that the existing nailers are securely anchored to the roof <br /> decks. <br /> 4. When an additional thickness of insulation is being added, new nailers must be <br /> added to match the height of the new insulation. Nailers must be securely <br /> anchored to the roof deck per Section 3.05 of this specification. <br /> 5. All roof surfaces shall be free of ponded water, ice, or snow and drain properly. <br /> Drainage is the responsibility of the roofing contractor and designer /specifier. <br /> 6. Specifier and roofing contractor shall determine the condition of the existing roof <br /> deck and roofing. Areas with deteriorated decking or wet insulation or other <br /> materials shall have those affected materials removed 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 /> Specific climatic and job conditions may require the use of a vapor retarder. It is the sole responsibility of <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 often act as an "air barrier" which may have a positive effect in reducing <br /> internal air pressure. 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 facilities. <br /> The National Roofing Contractor's Association recommends the installation of vapor retarders when <br /> interior relative humidity is 45% or greater and the outside mean average January temperature is below <br /> 40 °F. <br /> Contact Mule -Hide Customer Service Department for questions 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 roof penetrations and projections <br /> (unless otherwise shown on Mule -Hide standard details). <br /> B. Nailers shall be firmly anchored to the decks at a maximum 7 -0" o.c. and shall resist a <br /> pullout force of 200 lbs. /linear foot in any direction. A 1/2" vent space shall be provided <br /> between adjacent lengths of milers. Fasteners shall be installed within 6 inches of each <br /> end. Spacing and fastener embedment shall conform to Factory Mutual Loss Prevention <br /> Data SF eet 1-49 or local building code requirements. <br /> C. Height of nailers shall match the surface level of the insulation and roof membrane. <br /> D. All woodwork to be reused shall resist a minimum force of 200- lbs./linearfoot in any <br /> direction and shall be free of rot. <br /> 3.06 Insulation Installation <br /> A. Mule -Hide accepted roof insulations shall be installed in accordance with Mule -Hide <br /> specifications or the insulation manufacturer's requirements whichever is more stringent. <br /> 10 <br />