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enable installation of new plumbing vent pipe extensions and completion of flashings. b. Clean plumbing vent piping to ensure that joint surfaces are clean, dry, and free from contamination including dirt, oils, grease, tar, wax, rust, and other substances that may inhibit adhesive or sealant performance. 2. Installation a. Insert end of plumbing vent pipe extension into existing plumbing vent pip- ing. i. Verify circumference of existing plumbing vent piping and plumb- ing vent pipe extension is appropriate to achieve secure, rigid in- stallation. ii. Mark plumbing vent pipe extension at required height above fin- ished roof surface level, and cut to required length. iii. Apply adhesive or sealant to plumbing vent piping as appropriate to existing pipe material and plumbing vent pipe extension, and mate plumbing vent pipe extension to existing piping. Apply ade- quate adhesive or sealant to achieve secure, rigid installation. 3.7 LIGHTWEIGHT CONCRETE FILL A. Remove all loose, wet, and deteriorated existing lightweight concrete fill from repair area. B. If fill is wet or deteriorated down to the steel form deck refer to Steel Deck Repair specifi- cation section. C. Mix lightweight concrete fill with water utilizing ratios, quantities, and methods recom- mended by the manufacturer. D. Slowly pour lightweight fill into repair area and screed off flush with surrounding existing fill. E. Mechanical attachment of base sheet may begin after the new fill has set. 3.8 STEEL PLATE INSTALLATION A. Mechanically attach deck repair plates to concrete deck with approved fasteners 6" on 3.9 SCUPPER INSTALLATION A. Locate bottom of overflow scupper 2 inches above surface of the roof system adjacent to the nearest roof drain (excluding sump). B. Remove existing masonry and store for reuse if in good condition. Reinstall masonry units to extent possible. Provide new brick or concrete masonry units to match existing. C. Extend opening through entire thickness of parapet. Take precautions to avoid damaging adjacent wall surfaces. D. Provide finished openings as indicated. E. Install veneer materials of same type, size and finish to match existing. Set units in full beds of mortar to match adjacent joints in thickness. Tool joints to match. F. Repair exterior finish to match adjacent surfaces. IRC -1838 Indian River County - Main Library Roof Replacement 0701 50-5 Preparation for Reroofing (Revision 1)