A. All formwork shall comply with all the recommendations of ACI 347 “Recommended Practice for Concrete Formwork” except as modified herein. B. The CONTRACTOR shall assume full responsibility for the design and construction of all formwork. 1.2 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS A. Commercial Standards ACI 117 Specifications for Tolerances for Concrete Construction and Materials. ACI 301 Specifications for Structural Concrete for Buildings. ACI 347 Recommended Practice for Concrete Formwork. 1.3 QUALITY ASSURANCE A. The CONTRACTOR shall set and maintain concrete forms and perform finishing operations so as to ensure that the completed work conforms to the shape, line, grade, and dimensions as shown in the drawings. Formwork tolerances shall not exceed permissible deviations given in ACI 117. Use Class A formwork facing material offset. Use “very flat floor” finishing tolerance. See Section 03 30 00 for additional construction tolerances. Tolerance is the specified permissible variation from lines, grades, or dimensions shown. Surface defects and irregularities are defined as finishes and are to be distinguished from tolerances. PART 2 -- PRODUCTS 2.1 MATERIALS A. For all concrete surfaces to be unexposed, form surfaces that will be in contact with concrete shall be of No. 2 common or better lumber or other material producing equivalent finish. B. For all concrete surfaces to be exposed, finishes shall be as specified in Section 03 30 00. C. Form ties shall be factory-fabricated, snap-off metal ties of design that will not allow form deflection and will not spall concrete upon removal. Wire ties will not be permitted. Ties shall be free of devices that will leave a hole larger than 1 inch or less than 1/2-inch in diameter in the concrete surface. The portion of the tie remaining in the concrete after removal of the exterior parts shall not project beyond the surface of the concrete and shall be at least 1-1/2 inches back from any surface of the concrete that will be exposed, painted, damp-proofed, waterproofed, or receive direct applications of plaster
