Appendix_-_Ceiling_Tiles_per_Bar_Screens.pdf
PDF 425 KB Posted
- Attached to
- Anacostia II WWPS PLC Upgrades project
- Solicitation number
- 98587
- Issued by
- Prince George's County, Maryland
About this file
This is a specification document for acoustical tile ceilings prepared by the Washington Suburban Sanitary Commission (WSSC) in Maryland for the Anacostia No. 2 Wastewater Pump Station (WWPS) Bar Screen and NFPA 820 Upgrades project dated August 2022. The specification outlines requirements for suspended grid ceiling systems and recessed edge lay-in acoustical panels to be installed in designated areas of the facility. The project calls for fire-resistive mineral fiber acoustical units measuring 24 inches by 24 inches with a minimum thickness of 3/4 inch, featuring a noise reduction coefficient of 0.65 minimum and ceiling attenuation class rating of 35 minimum. Acceptable manufacturers for suspension systems include Armstrong, Chicago Metallic Corp., and USG, while acoustical panel suppliers are limited to Armstrong (Cirrus Open Plan) and USG (Eclipse Clima Plus). The specification requires detailed shop drawings indicating grid layout, hanger spacing, and fastening details, along with product samples prior to installation. 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.
The specification requires compliance with ASTM standards for suspension systems and acoustical products, including ASTM C635 for intermediate or light-duty aluminum tee grid systems with exposed flanges and ASTM A580 for stainless steel hanger wire and wire ties. Installation requirements include maximum 4-foot on-center hanger wire spacing, proper wire splays not exceeding 5 inches in vertical drop, and four-way wire splays at 45-degree angles for every 144 square feet of ceiling area. The contractor must coordinate with mechanical and electrical work, install edge molding at intersections with vertical surfaces, and provide one percent additional material from the same production run for future maintenance. All materials must be delivered in original protective packaging with manufacturer labels indicating brand name, pattern, size, thickness, and fire rating, and must be stored to prevent soiling, physical damage, or moisture exposure.
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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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Bar Screen and NFPA 820 Upgrades August 2022
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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Bar Screen and NFPA 820 Upgrades August 2022
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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Bar Screen and NFPA 820 Upgrades August 2022
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 |
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