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ACOUSTICAL CEILINGS Section 09510 15-1207 1) SDS greater than 1.15 and less than 1.73: For z/h greater than 0.5: 8'x 12' For z/h less than or equal to 0.5: 12'x 12' 2) SDS greater than 1.73: For z/h greater than 0.5: 8'x 8' For z/h less than or equal to 0.5: 8'x 12' 2. Method of Attachment: Secure all lateral bracing to structural members as shown on the plans. Secure at right angles to the direction of the partition and four ways in large ceiling areas. 3. Attachment of bracing wires shall be in accordance with ASTM C636, Part 2, and as shown; no splicing is allowed. C. Compression Struts: Install per drawings at bracing wire lateral force bracing. Compression strut shall resist vertical component of force induced by the bracing wires. Fasten strut to main runner and extend to and fasten to the structural members supporting the floor or roof above. 1. Strut and diagonal bracing shall be designed and constructed in compliance with the DSA IR, and shall not be more than 1 (horizontal) in 6 (vertical) out of plumb. 2. Provide solid blocking wherever necessary for proper installation and connection at strut to floor or roof framing. D. Acoustical Ceiling Panels: 1. Install acoustical panels in coordination with suspended system, with edges resting on flanges of main runner and cross tees. Cut and fit panels neatly against abutting surfaces. Support edges by wall moldings. 2. Cut and rabbet edges of tegular edge acoustical panels, at border areas and vertical surfaces to exactly match factory cut tegular edge. 3. Panel weighing more than'/2 P.S.F. shall be positively attached to ceiling runners in accordance with IR 25-2-13. E. Demolition of Existing Suspended Ceiling System and Panels: Where existing suspended acoustical ceilings are indicated to be removed, unless otherwise noted, this includes the acoustical panels, ceiling grid, all accessories and trim, hanger wires, bracing wire, compression struts, and any other components that are a part of the existing ceiling system. All components for the specified ceiling system are to be new. 3.04 ADJUSTING AND CLEANING A. Upon completion, clean soiled and discolored surfaces so that installation is free from defects. Remove and replace damaged or improperly applied material, as directed. B. Acoustical ceiling panels, acoustical ceiling tile and suspended ceiling system shall be free of scratches, stains, smudges, fingerprints, discolorations, breaks, chips or other damage. Finished ceilings shall be uniform in appearance, including uniform color and texture. E