b. Warpage: 1) Inspect tops for warpage prior to fabrication by placing on true flat surface. a) Maximum allowable warpage: 1/16-inch (1.5 mm) in 36-inch (900 mm) span or 3/16-inch (4.5 mm) in 96-inch (2400 mm) span. c. Fabrication: 1) Shop fabricates in longest practical lengths. a) Bond joints with highly chemical resistant cement with properties and color similar to base material. b) Provide 1/8 inch (3 mm) drip groove at underside of exposed edges, set back ½ inch (13 mm) from face. c) Finish exposed edges. d. Edge treatment: 1) Standard 1/8 inch (2 mm) chamfered edge. e. Corner treatment: 1) Exposed corners shall be eased slightly for safety. f. Back and end splashes: 1) Supplied loose for field installation. 2) Same material and thickness as worksurfaces. 3) 4 inches high unless otherwise indicated. 4) Top-mounted end splash where worksurfaces abut adjacent construction and locations indicated on Drawings. g. Joints: 1) Maximum 1/8 inch (2 mm), bonded with epoxy grout. 2) Make joints between two benches level. 3) Locate joints away from sinks and over or near supports. h. Sink cutouts: 1) Routed for drop-in sink. i. Allowable tolerances: 1) Square. a) Plus, or Minus 1/64 inch (0.4 mm) for each 12 inches (300 mm) of length. 2) Location of cutouts and drilled openings. a) Plus, or Minus 1/8 inch (3 mm) of design dimension. 3) Size of cutouts and drilled openings. a) Plus 1/8 inch (3 mm) or minus 0 inches (0 mm). 3. Epoxy Resin Sinks: a. Mold sinks from thermosetting epoxy resin. b. Mold interior corners to radius and slope sink base to drain outlet. 1) Provide 1-1/2 inch (38 mm) outlet with open ended standpipe. a) Standpipe overflow 2 inches (50 mm) shorter than depth of sink. c. Unless otherwise indicated fabricate sinks of drop-in design supported by upper flange from worksurface. 1) Color. a) Match adjacent worksurface.
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