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ACOUSTICAL CEILINGS Section 09510 15-1207 foot intervals and locked to main runners in true alignment and to provide a continuous cross tie right angle to main runner. At two adjacent walls main runners and cross tees shall be securely interlocked to wall angles per the drawings. Secure wall moldings to walls as shown.. 3. Expansion Joints and Penetrations: a. Expansion joints shall be provided where require by the DSA IR and in accordance with ASTM E 580. b. Sprinkler heads and other similar devices that are not integrally tied to the ceiling system in the lateral direction shall have a 2 inch oversized ring, sleeve or adaptor through the ceiling tile to allow free movement of one inch in all horizontal directions. A flexible sprinkler hose fitting that can accommodate 1 inch of ceiling movement may be provided in lieu of the oversized ring, sleeve or adaptor. 4. Hanger wires shall be provided for all main runners and cross runners within 8" of ceiling perimeters or as indicated otherwise in drawings. Install hanger wires as plumb as possible at all locations. Secure to main runners at lower end. Hanger wires to be no more than 1 in 6 out of plumb. Attachment of hanger wires shall be in accordance with ASTM C636, Part 2, and as shown. 5. Separate all ceiling hanger and bracing wires at least six inches from all unbraced ducts, pipes, conduits, etc. 6. Provide field testing of drilled in concrete anchors or power actuated anchors as shown. power actuated anchors in concrete are not permitted for bracing wires. If any anchor fails, all anchors must be tested at no expense to the Owner. 7. Frame around light fixtures, grilles, registers, etc. All light fixtures shall be attached to the ceiling grid to resist a horizontal force equal to the weight of the light fixture. All 4 ft. x 4ft. light fixtures must have #12 gauge slack safety wires at each corner. 8. Flush or recessed light fixtures, mechanical terminals, and flexible sprinkler hose fittings, or services weighing less than 56 pounds may be supported on heavy duty grid but must have two #12 gauge slack safety wires from diagonal corners to the structure above. 9. All flush or recessed light fixtures and air terminals or services mounted in heavy duty suspension systems and weighing 56 pounds or more shall be independently supported by not less than four taut 12 gauge wires each attached to the fixture and to the structure above. The four taut 12 gauge wires including their attachment to the fixture shall be capable of supporting four (4) times the weight of the item being supported. 10. Projection screens suspended from runners shall utilize T -bar support clip, Caddy Clip "IDS" Series clips over grid with additional hanger wire and four splay wires. B. Lateral Bracing: A set of 4 bracing wires, splayed at 45 degrees, shall be provided at 12'-0" o.c. each way. Wires shall be taut without causing ceiling to lift. There shall be a brace assembly a distance of not more than 6'-0" from each surrounding wall, expansion joint and at the edges of any ceiling vertical offsets. A minimum of one set of bracing wires is required between any two adjacent expansion cut-outs on runners being braced. a. Lateral Force Brace Assembly Spacing: When the Design Spectral Acceleration Parameter (SDS) indicated on the structural plans, exceeds 1.15, the spacing for the lateral bracing assembly shall be reduced as follows: M