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Gateway Park Center PERKINS+WILL <br /> 810495.00 <br />12/06/18 <br />031000-6 Concrete Formwork <br />a)Class A – For surfaces prominently exposed to public view where <br />appearance is of special importance. <br />b)Class B – Coarse-textured concrete-formed surfaces intended to <br />receive plaster, stucco or wainscoting. <br />c)Class C – General Standard for permanently exposed surfaces <br />where other finishes are not specified. <br />d)Class D - Minimum quality surface where roughness is not <br />objectionable, usually applied where surfaces will be concealed. <br />4.Furnish forms in largest practicable sizes to minimize number of joints <br />and to conform to joint system shown on Drawings, using form materials <br />with sufficient thickness to withstand pressure of newly-placed concrete <br />without bow or deflection. <br />5.Butt Joints: Shall be solid and complete with backup material to prevent <br />leakage of cement paste. <br />B.Form Finishes for Exposed Surfaces: <br />1.Type: Straight, smooth, free of cement paste leaks at butt-joints, surface <br />imperfections and other irregularities detrimental to appearance of <br />finished concrete, fully coordinated with requirements for required finish <br />material. <br />2.Form exposed areas of columns, beams, ledges, balcony fascias to <br />achieve true alignment and level soffit of edge beams and concrete <br />edges. All such areas must be sharp, straight and true to line and level. <br />Edge beams and concrete canopies and ledges must have adequate <br />shoring to prevent any visible amount of sag and sufficient bracing to <br />prevent any lateral movement during construction. <br />2.2 FORM MATERIALS <br />A.General: Plywood, fiberglass, metal, metal-framed plywood faced, or other <br />acceptable panel-type materials. <br />1.Provide materials with sufficient strength to prevent warping. <br />B.Plywood: Of species and grade suitable for intended use, sound undamaged <br />sheets with clean true edges, minimum 5/8" (16mm) thick, complying with U.S. <br />Product Standard PS-1. <br />1.Other Acceptable Sheet Materials: 14 gauge (2.0mm) sheet steel or <br />fibrous glass reinforced resin. <br />C.Lumber: Construction grade or better consistent with calculation requirements, <br />without loose knots or other defects. <br />1.Use only where entire width can be covered with one board 11-1/4" <br />(285mm) or less in width.