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System Specifications MECHANICALLY ATTACHED TPO Revised March 2015 5. On recover projects,tear off all existing base flashings, cant strips and.projection flashirip down to the substrate. The flashing substrate shall be dry and tee of dii,dirt,-grease,sharp edges;and debris. 6. Gravel over existing nailers must be totally removed prior to installing new nailers and flashin6s. Verify that the existing nailers are in good condition and securely an6hofed to the roof decks. 7. When an additional thickness of insulation is being added, new nail6rs,must be added to matcli the height of the new insulation. Nailets'must be securely anchored to the roof,deck-per Section 3.0t of this specificatlon. 8. All roof surfaces shall be free of poncled water, ice,or snow; Sig.nificant,ponding that remains after a period of 48 hours should be eliminated by either installing tapered insUlatioh to create p6sitive.draina06 of the roof surface or by installing 60 W'dtains in the 16W areas where the lJonding remains. Positive drainage shall also ellihihate the possibility of excatisiVe live logdt caused by p6hding water that could cause structural damage or failure. 9. When removing an existing roof during reroofing, remove only y that amount of roofing and flashing that can be made watertightwith new Mule-Hide TPO materials in a onia-d6y period or prior to the onset of inclement weather. 10. Recovering over a gravel surfaced BUR systems require the installation of an acceptable insulation. Loose gravel must be removed. All lead pipe and dtain flashings shall be removed. 11. Smooth Surfaced BUR and smooth Modified Bitumen roofing systems shall require t installation of.an,acceptable insulation or sli.psheet All lead pipe and ALL WORK SHALL COMPLY\'V'TH PF" ivings shall be removed. Single-ply membranes such as EPDM, Hypalon, PVC or CPA mutt have all existing flashings removed,the field sheet must be cut up into sections no larger than 10'IYy 10',aild:an acceptable layer of CODES FLORIDA BUILDING CODE NA11014AL ELECTRIC CODE, insulation shall be over - e E C OF ZF th- existing field membrane. AND T14 CITY P14YRHILLS ORDINANCES 12. Polyurethane Foam roofing systems("PUF")are not acceptable for recover applications. The PUF system must be completely removed and new insulation "Vd prior to the installation of the new TPO Roofing System.. JAN Voi Z" 1.7 Mule-Hide Premium warranty is requested,-the existing roof system must be CITY(jr ZEPHYRHIL— / emdV6d to the deck prior to the irittallatioh.6f the new roofing system or a PLANS EX��Pv?,JNEC) moisture survey by an independent third a party must b*6 taken,call wet areas Dyed and,a copy of the survey submitted to Mule-Hide with the Warranty application.ition. . 3.04 Vapor Retarder Installation(where.specified) A. Specific climatic and job conditions may require the use of a vapor retarder. It is the sole responsibility of tfie.design professional to determine the need for a vapor retarder,and its-type and location in the r6ofing,system. A vapor retarder may often act as an"air baim6r"Which may have 6 positivi. effect in reducing internal air pressure. Vapor retdtdbrs should be strongly considered for building:subject to high internal air pressures such as airplane hangars and buildings with many loading bays such as warehouse facilities. B. The National Roofing Contractor's Association recommends the installation of vapor retarders when interior relative humidity 19 45%or greater and the outside mean average January temperature is below-40-F. Page 14 05-1111 WLE-HIDE PRODUCTS CO.,INC