SECTION ACOUSTICAL CEILING SYSTEMS

Transcription

1 SECTION PART 1 - GENERAL 1.01 SUMMARY A. This Section includes the following: 1. Ceilings consisting of acoustical panels and exposed suspension systems. 2. T-Bar mounted light fixture support brackets. 3. Acoustic tile, adhesive applied to backing materials; plastic edge trim. B. Related Divisions include the following: 1. Division 09 Gypsum Board Systems. 2. Division 23 Section Mechanical. 3. Division 26 Section Electrical RELATED DOCUMENTS: A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. B. Requirements of Regulatory Agencies: 1. Codes: Conform to CCR Title 19, 21, and 24 (in particular, Part 2, Chap. 25A) and UBC Std. 25-2, which refers to U.L. "Tunnel Test" for Fire Hazard Classification of Building Materials. 2. Structural: a. Per Title 24, Section 2501A.1 in particular; with all ceiling assemblies being "designed brace systems" as a min. standard; and any additional requirements specified herein or shown. b. Framing shall comply with the most stringent of ASTM C635 "Standard Specification for Metal Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings" and UBC Standard 25-2, latest edition, of same title. C. Reference Standards; Acoustical Materials: 1.03 QUALITY ASSURANCE: 1. Acoustical & Insulating Materials Assoc. (AIMA) Bulletin "Performance Data for Architectural Acoustic Materials." 2. Fed. Spec. (FS) SS-S-118A, Sound Control Blocks & Board (Acoustical Tiles & Panels, Prefabricated). A. Installer Qualifications: Engage an experienced installer who has completed acoustical panel ceilings similar in material, design, and extent to that indicated for this Project and with a record of successful in-service performance. B. Source Limitations for Ceiling Units: Obtain each acoustical ceiling panel from one source with resources to provide products of consistent quality in appearance and physical properties without delaying the Work. C. Source Limitations for Suspension System: Obtain each suspension system from one source with resources to provide products of consistent quality in appearance and physical properties without delaying the Work. Improvements to Existing Modular Classrooms for Interim Housing Page 1 of 8

2 D. Fire-Test-Response Characteristics: Provide acoustical panel ceilings that comply with the following requirements: 1. Fire-response tests were performed by UL, ITS/Warnock Hersey, or another independent testing and inspecting agency that is acceptable to authorities having jurisdiction and that performs testing and follow-up services. 2. Surface-burning characteristics of acoustical panels comply with ASTM E 1264 for Class A materials as determined by testing identical products per ASTM E 84. E. Design Criteria: Suspension system to limit deflection of finished ceiling to 1/360 of span or less SUBMITTALS: 1. Allowable Tolerance: 1/8" max. permissible variation from true plane measured from 10 foot straightedge placed on finished ceiling surface. A. All submittals shall be made in accordance with Division 01. B. Samples: 1. Samples for Initial Selection: Manufacturer s color charts consisting of actual acoustical panels or sections of acoustical panels, suspension systems, and moldings showing the full range of colors, textures, and patterns available for each type of ceiling assembly indicated. 2. Samples for Verification: Full-size units of each type of ceiling assembly indicated; in sets for each color, texture, and pattern specified, showing the full range of variations expected in these characteristics. a. 6-inch (150-mm-) square samples of each acoustical panel type, pattern, and color. b. Set of 12-inch- (300-mm-) long samples of exposed suspension system members, including moldings, for each color and system type required. C. Qualification Data: For firms and persons specified in Quality Assurance Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of architects and owners, and other information specified. D. Product Test Reports: Indicate compliance of acoustical panel ceilings and components with requirements based on comprehensive testing of current products. E. Research/Evaluation Reports: Evidence of acoustical panel ceiling s and components compliance with building code in effect for Project, from a model code organization acceptable to authorities having jurisdiction. F. Shop Drawings: 1. Submit for all work; reference to Architect's detail numbers. 2. Show complete plan layouts and installation details for all this work, accurately to scale. a. Ceiling suspension system members. b. Method of attaching suspension system hangers to building structure. c. Minimum Drawing Scale: 1/8 inch = 1 foot (1:96). 3. Show related work of other Sections that are installed in, attached to, or penetrates ceiling areas, such as: air distribution devices and electrical devices. a. Ceiling-mounted items including light fixtures; air outlets and inlets; speakers; sprinklers; and special moldings at walls, column penetrations, and other junctures of acoustical ceilings with adjoining construction 4. Show major ductwork and electrical conduit trays above ceilings. Improvements to Existing Modular Classrooms for Interim Housing Page 2 of 8

3 G. Product Data: 1. Suspension Grid for Lay-in Ceiling: Printed data for all suspension grid system components, including load tests. H. Maintenance Materials; Spare Acoustic Panels: Quantity equal to 1% of the area of each typical module size of acoustical panel, but not less than 8 of each size and in multiples of factory wrapped packages. Deliver to the Architect at Project Site, for transmission to District. District Supervisor will sign for all shelf materials at the completion of each phase of the work PRODUCT DELIVERY, STORAGE & HANDLING: A. Delivery: Deliver all materials to site in original sealed packages; mfr., brand, and product clearly identified thereon. B. Storage: Store materials in building area where they will be installed, in original package. Keep materials clean and free from damage due to water or deteriorating elements. Before installing acoustical panels, permit them to reach room temperature and a stabilized moisture content. C. Handle so as to prevent damage during storage and installation JOB CONDITIONS: A. Environmental Limitations: Do not install acoustical panel ceilings until spaces are enclosed and weatherproof, wet-work in spaces is complete and dry, work above ceilings is complete, and ambient temperature and humidity conditions are maintained at the levels indicated for Project when occupied for its intended use. B. Environmental Requirements: Maintain temperature in space at 55 F or above for 24 hours before and after, and all during application of materials. C. Sequencing, Scheduling 1.07 GUARANTEE: 1. Before concealing work of other Sections, ascertain that required inspections of such work have been made. 2. Coordinate with related work of other Sections. Coordinate location and symmetrical placement of air distribution devices, electrical devices, and all penetrations with appropriate Section. A. General: 2-year guarantee for all work. See Spec. Section , Contract Close-Out. Date shall initiate the warranty period. B. Acoustical Materials: A separate 15-year manufacturer s guarantee for dimensional stability of materials and against rust of the Tee Bar System. PART 2 - PRODUCTS 2.01 MATERIALS; SUSPENSION GRID FOR 2 X 4 LAY-IN ACOUSTICAL CEILINGS: A. For ceilings, products from USG Interiors, Inc. (800) , have been used to set the standard; products by other manufacturers meeting the specified characteristics will be accepted. B. T-Bar mounted light fixture support brackets: T-bridge support bracket: by Advance Design and Development Company, (510) or equal. Improvements to Existing Modular Classrooms for Interim Housing Page 3 of 8

4 C. Suspension System: Ceiling system shall be heavy-duty, consisting of two-way exposed grid steel tee, with members locked in place to form rigid grid. In addition to ceiling loads, the system shall be designed for lighting fixture loads when applicable. Design shall be in accordance with Table 16A-0, Title 24, CCR, and DSA IR M Main Runners (Heavy Duty): USG Interiors, Inc. Donn DX, as standard of quality. a. Length: 12 feet. b. Height: 1-1/2 inches. c. Allowable load per 4-foot spacing: 16 lbs./lin. Ft. d. Color: Factory White 2. Cross Tees (Heavy Duty): USG Interiors, Inc. Donn DX, as standard of quality. a. Length: 2ft. and 4 ft. b. Height: 1 x 1-1/2. c. Allowable load per 2 foot spacing: 32 lbs./lin. Ft. d. Color: Factory White 3. Wall Moldings and Trim: USG Interiors, Inc. Donn M7 Wall Angle, as standard of quality. a. Length: 12 feet. b. Flange: 7/8 inches. c. Metal: 24 gauge. d. Edges: Hemmed e. Color: Factory White 4. Hold-Down Clips: Ceiling Manufacturer s standard to fit system furnished. 5. Hanger Wire: No. 12 gauge, galvanized annealed steel. 6. Edge Moldings: a. Metal: Aluminum or steel with white baked enamel finish MATERIALS; ACOUSTICAL PANELS FOR LAY-IN ACOUSTICAL CEILINGS: A. General: 1. Flame Spread: 25 maximum for all panels; per "Tunnel Test", UBC Std Smoke Density: 10 maximum for all panels; per "Tunnel Test", UBC Std B. Acoustical Material: Tile and lay-in panels shall be ASTM E 1264 Type III, Form 2, Pattern CD Mineral Acoustical Material, Class A (ASTM E84), conforming to Federal Specification No. SS-S Mineral Tile for 2-0 x 4-0 lay-in ceiling: a. Pattern: USG Interiors, Inc. Radar ClimaPlus b. Size: 24 x 48 x 3/4 c. NRC:.70 d. CAC: e. Edge Detail: SLT (Tegular) f. Light reflectance:.84 g. Color: Factory White h. Texture: Non-Directional, medium textured, perforated 2. Mineral Tile for 2-0 x 2-0 lay-in ceiling: a. Pattern: USG Interiors, Inc. Radar b. Size: 24 x 24 x 5/8 c. NRC: Improvements to Existing Modular Classrooms for Interim Housing Page 4 of 8

5 d. CAC: e. Edge Detail: SLT (Tegular) f. Light reflectance:.84 g. Color: Factory White h. Texture: Non-Directional, medium textured, perforated. 3. Mineral Tile for 1-0 x 1-0 glue-on application: C. General Accessory Materials a. Pattern: USG Interiors, Inc. Radar b. Size: 12 x 12 x 5/8 c. NRC: d. CAC: e. Edge Detail: BESK (Bevel with kerf, or as applicable for glue-on application) f. Light reflectance:.84 g. Color: Factory White h. Texture: Non-Directional, medium textured, perforated. 1. Adhesive: As recommended by tile mfr. 2. Plastic edge trim shapes for glue-on tiles: J-shape, as recommended by acoustic tile mfr. 3. Splines: Fiber alignment splines for tile corners. 4. Other Acceptable Types: Equal or better products by USG and Celotex D. Lay-In At Food Service Instruction Rooms, and all open food preparation and service areas. PART 3 - EXECUTION 3.01 PREPARATION: 1. Kitchen Panel: Clean Room Mylar, #1716. a. Size: 24 x 48 inches b. Thickness: 3/4 inch c. Light Reflectance: 0.79 d. NRC: 0.55 e. CAC: 35 f. Edge: Square lay-in g. Surface Color: White A. Furnish layouts for inserts, clips or other supports and struts required to be installed by other trades that depend upon support by the suspended ceiling. B. Coordinate other trades to efficiently install their related work prior to final clips or fasteners to avoid damage by reinstallation. C. Lay-In Ceiling Systems: Compare layouts with construction conditions. Tile shall be spaced symmetrically about the centerlines of the room or space, and shall start with a tile or joint line, as required, to avoid narrow tiles at the finish edges unless indicated otherwise. Joints shall be tight with joint lines straight and aligned with the walls. Ceiling mouldings shall be used where tile abuts wall. Notify Architect of any discrepancies INSTALLATION; SUSPENSION GRID SYSTEMS: A. General: 1. System to be complete; all joints neatly and tightly joined and securely fastened; grid members hung in a true, flat, level plane. Improvements to Existing Modular Classrooms for Interim Housing Page 5 of 8

6 2. Hanger Wires: #12 typically, larger sizes as indicated and wound tight enough to prevent damaging tiles when removed. a. Secure wires to panel points and structure above per most stringent requirements of fabricator and Title 24, and as indicated on drawings. Wires shall be plumb (1:12) from the runners to the ceiling to allow easy removal of the panels. Make all runner wire connections less than ¼ inch, outside to outside of wire, to ensure easy removal of the Ceiling Tile. b. Wires exceeding 1:12 out-of-plumb shall be braced with counter-sloping wires thus making the wires in the area 12 inches above the runners plumb, thus ensuring Ceiling Tile removal without damage from wire ties. c. Keep wires 6" min. clear of un-braced ducts, pipes, and other items. d. Install wire within 6" of ends of all main runners and cross-tees at ceiling perimeters. e. When obstructions prevent direct suspension, provide approved trapezes or equivalent devices; 1-1/2" min. cold-rolled channels back-to-back may be used for spans to 6 feet max. f. Wire to be straight, without extraneous kinks or bends. 3. Bracing Wires to Resist Seismic Forces: #12 typically, larger sizes as indicated. a. System for Bracing Ceilings: Lay-In Ceiling Systems: Install one four-wire set of sway-bracing wires and a vertical strut for each 144 sf. max. of ceiling area. Locate wire-sets and struts at 12 feet max. O.C. At ceiling perimeters, wire-sets must be within 6 ft. of walls. b. Locate four-wire sets and struts within 2 in. of cross-runner intersection with main runner; space wires 90 from each other and run parallel to all runners. c. Do not install sway bracing wires at an angle greater than 45 with the ceiling plane. d. Wires to be taut without causing ceiling to lift. e. Secure struts as shown. 4. Provide all additional wires, #12 min., necessary to properly support grid at electrical devices, air distribution devices, vertical soffits, and other concentrated loads. 5. Grid: a. Grid members may be attached to 2 adjacent walls but must be 1/2" min. clear of other walls. b. Any grid members not attached to walls shall be interconnected to prevent spreading, near their free end, with a horizontal metal strut or #16 ga. taut tie wire. c. Provide additional tees or sub-tees to frame openings for lights, air distribution devices, electrical devices, and other items penetrating through ceiling, which do not have an integral flange to support and conceal cut edges of acoustic panels. Provide cross-bracing necessary to securely support any surface mounted fixtures or other items. 6. Attachment of Wires: a. To Wood Joists, or Framing Members: As indicated. Improvements to Existing Modular Classrooms for Interim Housing Page 6 of 8

7 b. To Grid Members: Insert through holes in members or supporting clips and make all runner connections less than ¼ inch, outside to outside of wire, to ensure easy removal of the Ceiling Tile. c. All wires to be fastened with tight turns; three tight turns min. for hanger wires; four tight turns min. for bracing wires. All turns to be made in a 1-1/2" max. wrap distance and wound tight enough to prevent damaging tiles when removed. B. Grid System for 2' x 4' Lay-In Acoustical Ceilings: 1. Main Runners: Space main runners 4'-0" apart; #12 hanger wires space 4'-0" on center max. along runners, and within 6" of ends. 2. Install wall mouldings. 3. Cross-Tees: Install between main runners in a repetitive pattern of 2' spacing as shown. 4. Sub-Tees: Install at edges of all penetrations, per above paragraph A.5.c. 5. Bracing Wires: Install as specified in Article 3.02A INSTALLATION; ACOUSTICAL PANELS: A. Lay panels into grid. Partial panels to be neatly cut, painted to cover exposed edges and fitted to grid and around penetrations and/or obstructions. Duplicate Tegular edges at partial panels; cuts to be straight. Repaint cut tiles to match existing color at visually exposed conditions. Architect and the District Project Manager to be final judges of exposed conditions ADHERED TILE INSTALLATION: A. Tile applied to solid backing surfaces shall be cemented in place using specified adhesive in accordance with manufacturer's installation recommendations. 1. Do not butter too many tiles in advance, as a skin will form and weaken the bonding ability. 2. Provide thicker adhesive where required to create a flush installation at patched areas. B. Tile shall be spaced symmetrically about centerlines of the room or space, and shall start with a tile or joint line as required to avoid less than one-half tiles at wall line. Joints shall be straight and tight and aligned with the walls or existing tile. Ceiling molds shall be used where tile abuts wall and where shown RELATED WORK SPECIFIED ELSEWHERE; INSTALLATION; LIGHT FIXTURES: A. This work to be performed by Division 26, Electrical. B. Fixtures Weighing Less Than 56 Pounds: Lay fixtures into grid, secure earthquake clips to grid members. Install two #12 ga. taut safety wires, plumbed (1:12), to each fixture at diagonally opposite corners, to support their weight independent of the grid. Make all runner safety wire connections less than ¼ inch, outside to outside of wire, to ensure easy removal of the Ceiling Tile. C. Fixtures Weighing More Than 56 Pounds: Lay fixtures into the grid, secure earthquake clips to grid members. Install not less than four taut #12 ga. wires, plumbed, capable of supporting four times the fixture load. Size the gage of the wire to meet the four times the weight requirement for proper support. Make all runner connections less than ¼ inch, outside to outside of wire, to ensure easy removal of the Ceiling Tile RELATED WORK SPECIFIED ELSEWHERE; INSTALLATION OF AIR DISTRIBUTION DEVICES: A. This work to be performed by Division 23, Mechanical. Improvements to Existing Modular Classrooms for Interim Housing Page 7 of 8

8 B. Lay air distribution grilles and other devices into grid. Install four #12 ga. taut wires, plumbed, to each device within 3" of device corners, to support their weight independent of the grid. Make all runner connections less than ¼ inch, outside to outside of wire, to ensure easy removal of the Ceiling Tile ADJUSTMENT & CLEANING: A. Cleaning: 1. General: After installation of acoustical material has been completed, clean all surfaces of the material, removing any dirt, or discolorations by foreign matter. 2. Acoustical Panels: Minor abraded spots and cut edges shall be touched up with the same paint as was used for factory applied finish of the lay-in panels under Division 09. END OF SECTION Improvements to Existing Modular Classrooms for Interim Housing Page 8 of 8