2024_02_13_CCGA_2423 Union Street Kitchen HVA.pdf

College of Coastal Georgia CCGA-2423 Union Street Kitchen HVAC Upgrades

NBP #23098

ADDENDUM NO. 2

A2 - 1

This Addendum forms part of the Contract Documents and modifies the original bidding documents dated January 17, 2024. Acknowledge receipt of this Addendum in the space provided on the Bid Form. Failure to do may subject the bidder to disqualification.

The contract documents are herein amended under the date of February 13, 2024 as follows:

AMENDMENTS TO THE SPECIFICATIONS

1. REPLACE existing SECTION 09 5100 – Acoustical Ceilings in its entirety with attached.

END OF ADDENDUM

College of Coastal Georgia January 17, 2024 February 13, 2024

Union Street Kitchen HVAC Upgrades Bid Set Addendum #2

NBP#23098

Acoustical Ceilings 09 5100 - 1

SECTION 09 5100 - ACOUSTICAL CEILINGS

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Suspended metal grid ceiling system.

B. Acoustical units.

1.2 REFERENCE STANDARDS

A. ASTM C635/C635M - Standard Specification for the Manufacture, Performance, and Testing of

Metal Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings; 2013a.

B. ASTM E1264 - Standard Classification for Acoustical Ceiling Products; 2014.

1.3 ADMINISTRATIVE REQUIREMENTS

A. Sequence work to ensure acoustical ceilings are not installed until building is under HVAC control, sufficient heat is provided, dust generating activities have terminated, and overhead work is completed, tested, and approved.

B. Do not install acoustical units until after interior wet work is dry.

1.4 SUBMITTALS

A. See Section 01 3000 - Administrative Requirements, for submittal procedures.

B. Shop Drawings: Indicate grid layout and related dimensioning and mechanical and electrical items installed in the ceiling.

C. Product Data: Provide data on suspension system components, acoustical units, and acoustical insulation.

D. Manufacturer's Installation Instructions: Indicate special procedures.

E. Maintenance Materials: Furnish the following for the Owner's use in maintenance of project.

1. Extra Acoustical Units: 100 tiles in unopened cartons.

1.5 FIELD CONDITIONS

A. Maintain uniform temperature of minimum 60 degrees F, and maximum humidity of 40 percent prior to, during, and after acoustical unit installation.

PART 2 PRODUCTS

2.1 ACOUSTICAL UNITS

A. Manufacturers:

1. Armstrong; Product 770 Kitchen Zone

Acoustical Ceilings 09 5100 - 2

2. Substitutions: Not permitted.

B. Acoustical Units - General: ASTM E1264, Class A.

C. Provide non-combustible tile/unit where indicated on plans and required by Code.

D. Acoustical Panel:

1. Size: 24 x 24 inches

2. Surface Pattern: Kitchen Zone Standard - Smooth

3. Surface Color: White

E. Acoustical Tile: Painted mineral fiber, ASTM Type: III, Form: 2, Pattern: C E with to the following characteristics:

1. VOC Content: Certified as Low Emission by one of the following :

a. GreenGuard Children and Schools; www.greenguard.org.

2. Size: 24 x 24 inches.

3. Thickness: 5/8 inches.

4. Composition: Water felted.

5. Light Reflectance: 87 percent, determined as specified in ASTM E1264.

6. NRC: 0.55

7. Ceiling Attenuation Class (CAC): 33, determined as specified in ASTM E1264.

8. Edge: Square layin.

9. Surface Color: White, except where noted to be painted matte black in Air Traffic Control

Labs. Shall be factory painted.

10. Surface Pattern: Lightly Textured.

2.2 SUSPENSION SYSTEM(S)

A. Manufacturers:

1. Same as for acoustical units.

2. USG.; Product USG DX/DXL 15/16" Exposed Tee: www.usg.com.

3. Substitutions: Not permitted.

B. Suspension Systems - General: Complying with ASTM C635/C635M; die cut and interlocking components, with stabilizer bars, clips, splices, perimeter moldings, and hold down clips as required. White painted.

Acoustical Ceilings 09 5100 - 3

C. Exposed Steel Suspension System: Formed hot dipped galvanized steel, commercial quality cold rolled; intermediate-duty.

1. Profile: Tee; 15/16 inch wide face.

2. Construction: Double web.

3. Finish: White painted, except where noted on drawings as painted black in Air Traffic

Control Simulation Labs. Shall be factory painted.

2.3 ACCESSORIES

A. Support Channels and Hangers: Galvanized steel; size and type to suit application, seismic requirements, and ceiling system flatness requirement specified.

B. Perimeter Moldings: Same material and finish as grid.

1. At Exposed Grid: Provide L-shaped molding for mounting at same elevation as face of grid.

C. Acoustical Insulation: Specified in Section 07 2100.

1. Thickness: 2 inch.

2. Size: To fit acoustical suspension system.

D. Acoustical Sealant For Perimeter Moldings: Non-hardening, non-skinning, for use in conjunction with suspended ceiling system.

E. Touch-up Paint: Type and color to match acoustical and grid units.

PART 3 EXECUTION

3.1 EXAMINATION

A. Verify existing conditions before starting work.

B. Verify that layout of hangers will not interfere with other work.

3.2 INSTALLATION - SUSPENSION SYSTEM

A. Rigidly secure system, including integral mechanical and electrical components, for maximum deflection of 1:360.

B. Lay out system to a balanced grid design with edge units no less than 50 percent of acoustical unit size.

C. Install after major above-ceiling work is complete. Coordinate the location of hangers with other work.

D. Hang suspension system independent of walls, columns, ducts, pipes and conduit. Where carrying members are spliced, avoid visible displacement of face plane of adjacent members.

Acoustical Ceilings 09 5100 - 4

E. Where ducts or other equipment prevent the regular spacing of hangers, reinforce the nearest affected hangers and related carrying channels to span the extra distance.

F. Do not support components on main runners or cross runners if weight causes total dead load to exceed deflection capability.

G. Support fixture loads using supplementary hangers located within 6 inches of each corner, or support components independently.

H. Do not eccentrically load system or induce rotation of runners.

I. Perimeter Molding: Install at intersection of ceiling and vertical surfaces and at junctions with other interruptions.

1. Use longest practical lengths.

2. Overlap and rivet corners.

J. The project includes reinstalling existing light fixtures in the exact same location as in the original ceiling layout. The new ceiling grid shall be measured, planned, and installed so that the existing light fixtures can be set in the new grid without any electrical re-wiring. Refer to

Sheets A2.01 and A2.02. The fixtures shall be removed from the existing ceiling and suspended from the structure during the ductwork installation. Provide new 18 ga wire to support light fixtures. The existing fixtures shall not be electrically disconnected. Refer to

Electrical Drawings.

3.3 INSTALLATION - ACOUSTICAL UNITS

A. Install acoustical units in accordance with manufacturer's instructions.

B. Fit acoustical units in place, free from damaged edges or other defects detrimental to appearance and function.

C. Fit border trim neatly against abutting surfaces.

D. Install units after above-ceiling work is complete.

E. Install acoustical units level, in uniform plane, and free from twist, warp, and dents.

F. Cutting Acoustical Units:

1. Make field cut edges of same profile as factory edges.

G. Where round obstructions occur, provide preformed closures to match perimeter molding.

3.4 WARRANTY

A. 30 year manufacturer warranty.

Acoustical Ceilings 09 5100 - 5

3.5 SCHEDULE

A. All other spaces: Ceiling Type 2

END OF SECTION