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THERMOPLASTIC MEMBRANE ROOFING -ADHERED Section 07541 15-1207 E. Reroofing Over Existing Bitumen Roofing F. General Criteria: The Owner's Representative and Applicator shall determine the condition of the existing roof deck and old roof system. Areas with deteriorated decking or wet materials are to be removed and replaced. 1. On graveled surfaces, all loose gravel and debris shall be removed by power brooming or vacuuming. All blisters shall be removed and sealed or cut, fastened down and sealed. Any accumulation of bitumen or other irregularities shall be scratched and removed so as to produce a smooth surface. 2. On smooth surfaced roofs, the surface must be clean and dry. All blisters shall be removed and sealed or cut, fastened down and sealed. For Type III hot asphalt attachment of new insulation board, priming of the old roof surface after preparation is necessary. 3. Coal -tar pitch or heavily resaturated roofs may require removal. Contact Sika Sarnafil Technical for coal -tar pitch or heavily resaturated reroof preparation requirements. 3.04 SUBSTRATE INSPECTION A. A dry, clean and smooth substrate shall be prepared to receive the Sarnafil Adhered roof system. B. The Applicator shall inspect the substrate for defects such as excessive surface roughness, contamination, structural inadequacy, or any other condition that will adversely affect the quality of work. C. The substrate shall be clean, smooth, dry, free of flaws, sharp edges, loose and foreign material, oil and grease. Roofing shall not start until all defects have been corrected. D. All roof surfaces shall be free of water, ice and snow. E. Sarnafil shall be applied over compatible and accepted substrates only. 3.05 VAPOR BARRIER / AIR BARRIER INSTALLATION (AS REQUIRED BY DESIGNER) General Criteria: Interior (inside temperature/relative humidity) and exterior conditions may create a need for a vapor barrier. The design professional shall decide whether a vapor barrier is necessary. It is the design professional's responsibility to determine the type and location of a vapor barrier. If sealed properly, a vapor barrier can also act as an air barrier (positive pressure) for roofs intended over air -permeable decks (steel, wood, precast, etc.). When reroofing over the existing asphalt roof, the old roof may be considered to be an adequate vapor barrier/air barrier if the details are properly sealed. A. Sarnavap-10 1. Steel Deck or Wood Deck (New Construction or Reroofing with Removal of Existing ip