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THERMOPLASTIC MEMBRANE ROOFING - ADHERED Section 07541 15-1207 1. Steel Deck: a) FM Approved Steel Deck - All rusted or deteriorated decking shall be brought to the attention of the Owner's Representative and FM to determine method of treatment or replacement. Surface -only rusted metal shall be sanded and treated with rust - inhibiting paint. Sections that have rusted deeper than the surface or are not structurally sound shall be removed and replaced. The use and type of steel roof deck construction shall conform to FM's recommendations as outlined in FM Loss Prevention data Sheet 1-29 and local requirements. b) Non -FM Approved Steel Deck - All rusted or deteriorated decking shall be brought to the attention of the Owner's Representative to determine method of treatment or replacement. Surface -only rusted metal shall be sanded and treated with rust - inhibiting paint. Sections that have rusted deeper than the surface or are not structurally sound shall be removed and replaced. Deck type shall match existing and the attachment shall conform to local code requirements. 2. Wood Deck: a) All rotted or deteriorated wood shall be removed and replaced. The deck thickness shall be 1-1/2 inch lumber or 15/32 plywood or match existing deck if greater. Deck type and attachment shall conform to local code requirements. Fastener heads shall be recessed into the wood surface. 3. Insulating Fill Substrate: All wet or deteriorated insulating fill shall be removed and replaced. All accumulations of bitumen shall be removed and the surface of the deck shall be smooth, and free of ridges and depressions. See steel/concrete requirements. C. Reroofing with Removal of Existing Single -Ply Roofing General Criteria: The Owner's Representative and Applicator shall determine the condition of the roof deck and existing insulation. Deteriorated decking or wet or deteriorated materials are to be removed and replaced. After removal of single -ply roof, inspect insulation boards and reuse only if dry and in stable condition. Add a Sika Sarnafil approved recover board or new insulation board. Fasten recover board or top layer of insulation in accordance with Sika Sarnafil's requirements. D. Reroofing Over Existing Single Ply Roofing General Criteria: The Owner's Representative and Applicator shall determine the condition of the roof deck and existing insulation. Deteriorated decking or wet or deteriorated materials are to be removed and replaced. Remove all debris from the existing single -ply roof and cut membrane to reduce future stress.. Install a layer of a Sika Sarnafil approved cover board or insulation board over the existing single ply. Fasten the board according to Sika Sarnafil's requirements. 17