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ACOUSTICAL CEILINGS Section 09510 15-1207 PART 3 - EXECUTION 3.01 INSPECTION A. Prior to installation of the work of this Section, carefully inspect and verify that installed work of all other trades is complete to the point where this installation may properly commence. B. Verify that suspended acoustical ceiling may be installed in accordance with the original design, all codes and regulations, and the reviewed Shop Drawings. C. In event of discrepancy, immediately notify Architect. Do not proceed in discrepant areas until discrepancies have been fully resolved. D. Installer shall examine all substrates and verify that ceiling surfaces are acceptable. Notify Contractor of conditions detrimental to proper installation of ceiling tile. Beginning work indicates acceptance of existing conditions. 3.02 PREPARATION A. Lay out suspension system and acoustical ceiling panels as indicated in drawings. Install all acoustical units with grain in same direction as applicable. B. Coordinate with mechanical and electrical trades in correct locations of lighting fixtures, grilles, registers and other items to be installed in suspension system. C. Measure each ceiling area and establish layout of adhesive applied acoustical ceiling tiles to balance border widths at opposite edges of each ceiling. Avoid use of less than half -width units at borders and comply with reflected ceiling plans. D. Prior to installation of the suspended ceiling system, a copy of an acceptable substantiating test report and certifications shall be submitted to the Architect as described in article 1.03 above for review. The test shall show that the axial tension and compression ultimate load capacity of the runners and cross runners and their splices, intersection connections and expansion devices complying with these specification requirements. Evaluation of test results shall be made on the basis of the mean values resulting from tests of not fewer than three identical specimens, provided the deviation of any individual test result from the mean value does not exceed plus or minus 10 percent. Tests shall be made by an approved testing agency. 3.03 INSTALLATION OF SUSPENDED CEILING SYSTEM AND PANELS A. Suspended Ceiling System: Install in accordance with manufacturer's printed instructions, drawings, ASTM C636, ASTM E580, and the DSA IR. Fabrication and erection methods and workmanship shall result in completed installation that is neat and uniform, free from defects and irregularities. Suspended ceiling system member lengths shall be as long as is practical. 1. Install wall moulding at perimeter securely fastened at all, straight, level and in true alignment with plane of grid. 2. Hang main runners in a flat., true, level plane, spaced 4 -feet on -center and supported by hanger wires spaced not more than 4 -feet on -center. Cross tees shall be placed on 2 7