Appendix_-_Ceiling_Tiles_per_Bar_Screens.pdf
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- Attached to
- Anacostia II WWPS PLC Upgrades project
- Solicitation number
- 98587
- Issued by
- Prince George's County, Maryland
About this file
This is a technical specification document for acoustical tile ceiling installations prepared by the Washington Suburban Sanitary Commission (WSSC) for the Anacostia No. 2 Wastewater Pump Station (WWPS) Bar Screen and NFPA 820 Upgrades project in Maryland. The specification details the requirements for suspended grid ceiling systems and fire-resistive mineral fiber acoustical tile panels to be installed throughout designated areas of the facility. The specification requires exposed aluminum tee grid suspension systems from approved manufacturers (Armstrong AL Prelude Plus, Chicago Metallic 830, or USG Donn AX) with stainless steel hanger wire spaced maximum four feet on center, along with recessed edge lay-in acoustical panels measuring 24 inches by 24 inches with a minimum 3/4-inch thickness, Class A fire rating, and a minimum Noise Reduction Coefficient (NRC) of 0.65. Installation must comply with ASTM C635 and C636 standards and include detailed shop drawings showing grid layout, hanger spacing, fastening details, and change-in-level details. Environmental conditions must be maintained at 65 to 75 percent humidity and 55 to 70 degrees Fahrenheit for 25 hours before, during, and after installation. Approved acoustical panel products include Armstrong Item 556 Cirrus Open Plan and USG Item 76775 Eclipse Clima Plus, both finished in painted white.
The specification establishes execution requirements for sequencing work to coordinate with mechanical and electrical systems, hanging the suspension grid level and in straight alignment, installing edge molding at intersections with vertical surfaces, and placing acoustical units to bear fully on suspension members. Contractors must provide additional material equal to one percent of the installed ceiling area from the same production run as backup stock. Materials must be delivered in original protective packaging with manufacturer labels indicating brand name, pattern, size, thickness, and fire rating. All submittals require detailed shop drawings, one 12-inch square sample of each acoustical unit material, and full-size samples of each suspension system member and molding marked with manufacturer information and technical data. Post-installation cleaning and touch-up of any scratches, abrasions, or defects in painted surfaces are required. Areas receiving acoustical tile ceilings are indicated on the project's Interior Finish Schedule.
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09210-1 WSSC Anacostia No. 2 WWPS Acoustical Tile Ceilings Bar Screen and NFPA 820 Upgrades August 2022
SECTION 09210
ACOUSTICAL TILE CEILINGS
PART 1 GENERAL
1.1 REFERENCES
A. The following is a list of standards that may be referenced in this section:
1. ASTM International (ASTM):
a. A580, Standard Specification for Stainless Steel Wire.
b. C635, Standard Specification for the Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Lay-In Panel Ceilings.
c. C636, Standard Practice for Installation of Metal Ceiling Suspension Systems for Acoustical Tile and Lay-In Panels.
d. E1264, Standard Classification for Acoustical Ceiling Products.
1.2 SUBMITTALS
A. Action Submittals:
1. Shop Drawings:
a. Detailed layout of grid indicating hanger spacing, fastening and splicing details, change in level details, and access location.
b. Manufacturer’s recommendation for installation of system.
2. Samples:
a. One 12-inch square of each acoustical unit material to illustrate range of appearance.
b. One full-size sample of each suspension system member and molding.
c. Mark with the name of the manufacturer and specific design and technical data.
1.3 DELIVERY, STORAGE, AND HANDLING
A. Deliver materials with manufacturer’s labels indicating brand name, pattern, size, thickness, and fire rating.
B. Store materials in original protective packaging to prevent soiling, physical damage, or wetting.
1.4 ENVIRONMENTAL REQUIREMENTS
A. Maintain humidity of 65 to 75 percent in area where acoustical materials are to be installed for 25 hours before, during, and 25 hours after installation.
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B. Maintain a uniform temperature of 55 to 70 degrees F during installation of materials.
1.5 EXTRA MATERIAL
A. Provide additional acoustical units from the same production run as installed equal to 1 percent of area.
PART 2 PRODUCTS
2.1 SUSPENSION SYSTEMS
A. Components, Materials, and Accessories: Product of a single manufacturer.
B. ASTM C635, Intermediate or Light Duty:
1. Exposed Aluminum Tee Grid:
a. Nonrated and spaced to fit lay-in panels.
b. Finish: Factory-painted low-sheen satin white finish.
c. Exposed flange width of 15/16 inch.
d. Manufacturers:
1) Armstrong; AL Prelude Plus system.
2) Chicago Metallic Corp.; All aluminum 830 system.
3) USG; Donn AX system.
2. Hanger Wire: ASTM A580, minimum 12-gauge stainless steel wire.
3. Wire Ties: ASTM A580, 18-gauge stainless steel wire.
4. Furnish manufacturer’s hold down clips and accessories required for a complete system.
2.2 ACOUSTICAL UNITS
A. Recessed Edge Lay-in Panels:
1. Material: Fire-resistive mineral fiber, Class A.
2. Reference Specification: ASTM E1264, Type III, Form 1.
3. Pattern: Fine.
4. Sag and moisture resistant.
5. Noise Reduction Coefficient (NRC): 0.65 minimum.
6. Ceiling Attenuation Class (CAC): 35 minimum.
7. Light Reflectance: LR 0.80 or over.
8. Nominal Size: 24 inches by 24 inches, 3/4 inch minimum thick.
9. Edges: Angular, tegular.
10. Finish and Color: Painted white.
11. Manufacturers and Products:
a. Armstrong; Item 556, Cirrus Open Plan.
b. USG; Item 76775, Eclipse Clima Plus.
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PART 3 EXECUTION
3.1 SEQUENCING
A. Lay out grid.
B. Coordinate with mechanical and electrical equipment in framing and cutting material around ceiling penetrations.
C. Install suspension systems after mechanical work above is complete.
D. Install acoustical units.
3.2 INSTALLATION OF SUSPENDED GRID SYSTEM
A. Hang level and in straight alignment directly from structure following ASTM C636 and the manufacturer’s current printed instructions for type of installation required for this Project.
B. Hanger Wires:
1. Space maximum 4 feet on center each direction and securely attach to structure above.
2. Install additional hangers at ends of each suspension member and at light fixtures, 6 inches from vertical surfaces.
3. Do not splay wires more than 5 inches in a 4-foot vertical drop.
4. Provide four-way wire splays at 45 degrees from main runner to support structure for every 144 square feet of ceiling area.
5. Wrap wire minimum three times horizontally, turning ends upward.
6. Where hanger wires cannot be hung vertically from structure above because of ducts, pipes, cable trays, or other interferences, provide trapezes of steel channels (minimum 2-inch deep, 16-gauge cold-rolled carrying channels) hung on steel rods or 8-gauge wire from structural members above. Hang ceiling wires from these trapezes or similar members supporting ducts or pipes. Do not hang directly from ducts or pipes.
C. Edge Molding:
1. Install at intersection of suspended ceiling and vertical surfaces.
2. Miter corners where moldings intersect or install corner caps.
3. Attach to vertical surface with mechanical fasteners.
D. Provide additional channels, hangers, and trapezes as required to support edges of ceiling around and under mechanical and electrical work.
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3.3 INSTALLATION OF ACOUSTICAL UNITS
A. Install with pattern running in one direction after completion of suspended grid system and other concealed work.
B. Place material to bear all around on suspension members.
3.4 CLEANING
A. Clean soiled or discolored unit surfaces after installation.
B. Touch up scratches, abrasions, voids, and other defects in painted surfaces.
3.5 SCHEDULE OF CEILING TYPES
A. Areas to Receive Acoustical Ceilings: Indicated on Interior Finish Schedule by
“SCT.”
**WSSC**
| Vol3_Dwgs_Anacostia No2 WWPS Bar Screens and NFPA 820 Upgrade_CEILING TILES.pdf |
| Vol1_ Specs01-10_Anacostia No2 WWPS Bar Screens and NFPA 820 Upgrades_CEILING TILES.pdf |
File details come from the government source that posted it. Updated .