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' <br /> . . . <br /> ' <br /> EXISTING ROOFING <br /> � <br /> R908.1 General. <br /> Materials and methods of application used for re-covering or replacing an existing roof covering shall <br /> comply with the requirements of this chapter. <br /> Exception: Reroofing shall not be required to meet the minimum design slope requirement ofone- <br /> quarter unit vertical in 12 units horizontal (2-percent slope) in Section R905-for roofs that provide <br /> positive roof drainage. <br /> R908.l.1 <br /> Not more than 25 percent of the total roof area or roof section of any existing building or structure shall <br /> be repaired, replaced or recovered in any 12-month period unless the entire existing roofing system <br /> or roof section ie replaced to conform to the requirements of this code. <br /> R908,2Stouctoral8od construction loads. <br /> The structural roof components shall be capable of supporting the roof covering system and the <br /> material and equipment loads that will be encountered during installation of the roof covering system. <br /> R908.3Rec0YeriDg versus replacement. <br /> New roof coverings oh8|| not be installed without first removing all existing layers of roof coverings <br /> where any 0f the following conditions occur: <br /> 1 Where the existing roof or roof covering is water soaked or has deteriorated to the point that the <br /> existing roof or roof covering is not adequate as a base for additional roofing. <br /> 2. VVhena the existing roof covering is wood shingle or ahmke, s|a&*, c/oy, cement or asbestos- <br /> cement tile. <br /> 3. Where the existing roof has two or more applications of any type of roof covering. <br /> 4' When blisters exist in any n)ofing, unless blisters are out or scraped open and remaining <br /> materials secured down before applying additional roofing. <br /> 5' Where the existing roof is to be used for attachment for a new roof system and compliance with <br /> the aeuurannont provisions of Section Fl9O5 cannot bamet. <br /> Exceptions: <br /> 0. Complete and separate roofing avetenno, such as standing-seam metal roof systems, that <br /> are designed to transmit the roof loads directly to the building's structural avmtanm and that d0 <br /> not rely on existing roofs and roof coverings' for support, ah8U not require the renoOve| of <br /> existing roof coverings. <br /> 7. Reserved. <br /> 8. The application of new protective coating over existing spray polyurethane foam roofing <br /> systems shall be permitted without tear-off of existing roof coverings. <br /> 9. Reserved. � <br /> 10. Roof coating. Application of elastomeric and/or maintenance coating systems over existing <br /> asphalt shingles shall be in accordance with the shingle manufacturer's approved installation <br /> instructions. <br /> Rg08,5ReioSta}}atiou0fmaterials. <br />