Part 1 - General

1.1 SUMMARY

This Section includes:

Edit to suit project requirements.

1. Acoustical panels.

2. Acoustical tiles.

3. Exposed suspension systems.

4. Concealed suspension systems.

5. Direct adhesion to substrates.

1.2 RELATED SECTIONS:

Following are examples of closely related sections found elsewhere in the project manual. Edit to match sections actually written.

A. Section 09250 - Gypsum Board.

B. Section 09840 - Acoustical Wall panels.

C. Section 09120 - suspension system framing and furring for plaster and gypsum board assemblies.

D. Division 15 Sections - mechanical work.

E. Division 16 Sections - electrical work.

1.3 REFERENCES:

A. ASTM A 446 Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot Dip Process, Structural (Physical) Quality.

B. ASTM A 641 Specification for Zinc-Coated (Galvanized) Carbon Steel  Wire.

C. ASTM C 423 Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method.

D. ASTM C 635 Specification for the Manufacture, Performance and Testing of Metal Suspension Systems for Acoustical Tile and Lay-in Panels

E. ASTM C 636 Practice for Installation of Metal Ceiling Suspension Systems for Acoustical Tile and Lay-in Panels.F. ASTM D 1779 Specification for Adhesion for Acoustical Materials.

G. ASTM E 84 Surface Burning Characteristics of Building Materials.

H. ASTM E 119 Fire Test of Building Construction and Materials.

I. ASTM E 413 Classification for Rating Sound Insulation.

J. ASTM E 488 Test Method for Strength of Anchors in Concrete and Masonry Elements.

K. ASTM E 580 Practice for Application of Ceiling Suspension Systems for Acoustical Tile and Lay-In Panels in Areas Requiring Seismic Restraint.

L. ASTM E 795 Practices for Mounting Test Specimens During Sound Absorption Tests.

M. ASTM E 1264 Classification for Acoustical Ceiling Products.

N. ASTM E 1414 Test Method for Airborne Sound Attenuation Between Rooms Sharing a Common Ceiling Plenum.

O. ASTM E 1477 Light Reflectance of Acoustical Materials by the Integrating Sphere Reflectometer.

P. AWCI Association of the Wall and Ceiling Industries International

Q. CISCA Ceilings and Interior Systems Construction Association.

R. UL Underwriters Laboratories Inc. Fire Resistance Directory.

1.4 SUBMITTALS:

Reflected ceiling plans are not included, as they are typically incorporated with the contact drawings. If they are required as a shop drawing submittal, then included here.

A. Product data for each type of ceiling product including acoustical units and suspension system components.

B. Samples not less than 6 inches square of each type of acoustical ceiling unit.

C. Samples 8 inches long of each suspension system component.

D. Manufacturer's certificate that products meet or exceed specified requirements.

1.5 QUALITY ASSURANCE:

A. Installer Qualifications: An entity experienced in the installation of acoustical ceiling systems similar to requirements for this Project, and acceptable to, or licensed by, acoustical ceiling systems manufacturer.

B. Comply with the following standards:

1. CISCA "Acoustical Ceilings: Use and Practice."

2. CISCA "Ceiling Systems Handbook."

Delete following standard if not required.

3. CISCA “Recommendations for Direct-Hung Acoustical Tile and Lay-In Panel Ceilings. Seismic Zones 0-2.”

4. CISCA “Guidelines for Seismic Restraint Direct Hung Suspended Ceiling Assemblies. Seismic Zones 3 and 4.”

C. Fire Performance: Comply with the following:

1. Surface Burning Characteristics: Tested in accordance with ASTM E 84, and with suitable identification.

Retain the following for fire-rated assemblies.

2. Fire Resistance Rating: Test in accordance with ASTM E 119, UL Classified and listed in UL "Fire Resistance Directory."

a. Refer to Fire Resistance Directory for specified UL Design Number and related assembly construction data.

b. Consult with authorities having jurisdiction for requirements to achieve acceptable fire resistance rating for particular fire resistive assembly and components thereof.

1.6 DELIVERY, STORAGE, AND HANDLING:

A. Deliver acoustical ceiling system components in manufacturer's original unopened packages or containers, with labels intact.

B. Store all components to provide suitable protection against deleterious effects from exposure to moisture, direct sunlight, or other causes.

C. Handle all components to preclude damage. Take special precaution to prevent damage to acoustical ceiling unit edges and corners.

D. Comply with manufacturer's Material Safety Data Sheets (MSDS) for delivery, storage, and handling of components.

1.7 PROJECT CONDITIONS:

A. Environmental Conditions: Install acoustical ceiling systems only when temperature and humidity conditions closely approximate interior conditions to exist when building is occupied. Maintain this condition prior to, during, and after installation. However, as a minimum, maintain [60 degrees F to 85 degrees F with maximum 70 percent R. H.] [maximum 104 degrees F with maximum 90 percent R.H.] [maximum 104 degrees F with maximum 95 percent R.H.] [maximum 104 degrees F with maximum 100 percent R.H.].

B. Prior to installation, the following conditions must exist:

1. All windows and exterior doors in place and roof watertight.

2. Work of all wet trades completed and thoroughly dried to installation of any system components.

3. Mechanical and Electrical trades shall have completed their work above ceiling line prior to acoustical ceiling systems installation. Coordinate with Mechanical and Electrical trades prior to start of installation.

Delete following if not required.

4. When a pressurized return air plenum is being used, the ventilation system shall be operating 48 hours prior to installation of acoustical ceiling units to cleanse duct system.

1.8 EXTRA MATERIALS:

Select percentage or extra materials desired. A smaller percentage may be more suitable for large quantity projects.Provide extra material in a quantity equal to [5] [_______] percent of each system component installed, in manufacturer's standard packaging with suitable protection for storage and identification labels intact.Add special warranty provisions here, if required, to address uncommon project requirements. For example, high temperature/relative humidity warranty against visible sag. Verify that such a warranty is available. Note: Industry standard is one year for materials and workmanship. Ten year product and fifteen year system limited warranties are available on select products and systems.

PART 2 - PRODUCTS

2.1 MATERIALS, GENERAL:

ASTM E 1264 has replaced Federal Specification SS-S-118bProvide acoustical ceiling system materials in accordance with ASTM E 1264 and ASTM C 635.

2.2 ACOUSTICAL CEILING UNITS:

A. Manufacturer: Provide products specified herein as manufactured by CertainTeed.

Insert selected product and physical characteristics.

B. Product:

1. Name:[___________________________________________________________________].

2. Description:[_______________________________________________________________].

3. Physical Characteristics:

a. Type:[ ].

b. Form:[ ].

c. Surface Pattern:[ ].

d. Size, Nominal:[ ].

e. Edge Detail[ ].

Select one of the following color options:

f. Color:[ ].
f. Color: As selected from manufacturer's standard color line.
f. Color: Match Architect's control sample.

4. Performance Criteria:

Refer to CertainTeed product literature for values to be filled-in.

a. Noise Reduction Coefficient (NRC): [ ], pursuant to ASTM C 423.

b. Ceiling Attenuation Class (CAC): [ ], pursuant to ASTM E 1414 and ASTM E 413.

c. Minimum Light Reflectance Coefficient (LR): [ ], pursuant to ASTM E 1477.

d. Surface Burning Characteristics: The following, pursuant to ASTM E 84:

1) Flame Spread: 25 or less.

2) Smoke Developed: 50 or less.

Delete following if not required. Refer to UL Fire Resistance Directory for complete construction assembly information.

e. Time-Rated Fire Resistance Assembly: UL Design Number [___________]. Packages of acoustical material must bear appropriate UL Classification Marking.

Add additional UL Design if required, with appropriate designations for location.

If more than one acoustical ceiling unit is required, add additional products in same format. Revise article headings (usually by adding a designation such as "ACT 1") to differentiate products chosen. Coordination with room finish schedule is necessary.

2.3 EXPOSED SUSPENSION SYSTEM:

Fill-in manufacturer. Verify acceptability with acoustical ceiling unit manufacturer.

A. Manufacturer: Subject to compliance with requirements, provide product specified herein as manufactured by CertainTeed.

B. Product:

1. Name: [__________________________].

2. Grid Finish and Color:

Select one of the following color options.

a. [________________________________].

a. As selected by Architect from manufacturer's available selections.

a. Match Architect's control sample.

a. Color to match acoustical ceiling units.

Edit following three paragraphs to suit project requirements.

3. Structural Classification: [Light] [Intermediate] [Heavy] Duty in accordance with ASTM C 635.

4. Main runners, cross tees and related grid components manufactured of [cold-rolled galvanized steel] [cold rolled aluminum] with [15/16"] [9/16"] face dimension.

5. Attachment Devices: Size anchors and intermediate support members for 5 times design load indicated in ASTM C 635, Table I. Wire for hangers of size and type to suit intended application, complying with ASTM C 641, Class 1 zinc coating, not less than 12 gauge.

a. Angle Hangers: ASTM A 446 steel with G90 coating.

b. Flat Hangers: Zinc-coated steel.

c. Hanger Rods: Zinc-coated steel.

d. Concrete Anchors: Corrosion-resistant design; tested pursuant to ASTM E 488.

e. Seismic Restraints: Pursuant to CISCA recommendations, ASTM E 580 and local code requirements.

Select molding profile.

6. Moldings [Cold-rolled galvanized steel] [Cold-rolled aluminum], painted finish; [wall angle] [wall channel] [stepped profile] design [as shown], suitable for suspension system and ceiling unit profile.

Delete following if not required. Refer to UL Fire Resistance Directory for complete construction assembly information.

7. Time-Rated Fire Resistance Assembly: UL Design Number as specified for Acoustical Ceiling Units.
All main runners and cross tees must bear appropriate UL Classification Markings.

If more than one exposed suspension system is required, add additional products in same format. Coordination with room finish schedule is necessary.

2. 4 CONCEALED SUSPENSION SYSTEM:

Fill-in manufacturer.

A. Manufacturer: Subject to compliance with requirements, provide product specified herein as manufactured by
[____________________________________________________________________________].

Choose one of the following substitution options.

No substitutions are permissible.
Substitutions as acceptable to Architect are permissible.
Substitutions are limited to the following manufacturers.

1. [_________________________________________].

2. [_________________________________________].

B. Product:

1. Name:[____________________________________].

2. Structural Classification: Intermediate Duty in accordance with ASTM C 635.

3. Main runners, cross-tees, variable placement tees, grid adapters, splines, and access components manufactured of cold rolled galvanized steel.

4. Attachment Devices: Size anchors and intermediate support members for 5 times design load indicated in ASTM C 635, Table I. Wire for hangers of size and type to suit intended application, complying with ASTM C 641, Class 1 zinc coating, not less than 12 gauge.

Edit following to suit project requirements.

a. Angle Hangers: ASTM A 446 steel with G90 coating.

b. Flat Hangers: Zinc-coated steel.

c. Hanger Rods: Zinc-coated steel.

d. Concrete Anchors: Corrosion-resistant design; tested pursuant to ASTM E 488.

e. Seismic Restraints: Pursuant to CISCA recommendations, ASTM E 580 and local code requirements.

Select molding profile.

5. Moldings: Sold-rolled galvanized steel, painted finish; [wall channel] [stepped profile] design [as shown], suitable for suspension system and ceiling unit profile.

Delete following if none; edit to suit access requirements if retained

6. Access: Direct [upward][downward] initial access, [________] x [_________] in size for [every ceiling module] [each module as shown on Drawings].

7. Time-Rated Fire Resistance Assembly: UL Design Number as specified for Acoustical Ceiling Units. All main runners and cross tees must bear appropriate UL Classification Markings.

If more than one concealed suspension system is required, add additional products in same format. Coordination with room finish schedule is necessary.

2.5 MISCELLANEOUS MATERIALS:

A. Tile Adhesive: Pursuant to ASTM D 1779; type as recommended by tile manufacturer. Flame Spread: 25 maximum; pursuant to ASTM E 84.

B. Acoustical Sealant: As recommended by acoustical ceiling unit manufacturer.

PART 3 - EXECUTION

3.1 INSPECTION:

Determine acceptability of substrates and conditions under which acoustical ceiling systems are to be installed. Do not proceed until unacceptable conditions have been corrected. Commencement of installation constitutes Installer's acceptance of substrates and conditions.

3.2 PREPARATION:

A. Layout ceiling system in accordance with reflected ceiling plans and as acceptable to Architect.

Retain following for adhered tile applications. CISCA does not advise application over plywood or other surfaces, which expand and contract with changes in weather.

B. Surfaces to receive adhered tile shall be free of oils, form residue, dust or any other substance that may be detrimental to proper tile adhesion. Prime surfaces to receive adhered tile and test moisture-bearing substrates pursuant to CISCA recommendations.

C. Unless otherwise indicated, establish layout of acoustical ceiling units to balance border widths at opposite edges, with no units less than 1/2 width.

3.3 COORDINATION:

Coordinate layout and installation with other work supported by, or penetrating through ceiling, including, as applicable, light fixtures, HVAC equipment, fire suppression system components, and partition systems.

3. 4 INSTALLATION, GENERAL:

A. Prior to installation of acoustical ceiling units, open packages and allow product to stabilize to current environment.

Delete following if not required.

B. Install acoustical materials and suspension systems in strict accordance with the manufacturer’s printed recommendations, ASTM C 636, ASTM E 580 and CISCA recommendations.

Delete following if not required.

C. Adhered Installation: Adhere tile to properly prepared substrates pursuant to CISCA recommendations. Install splines in tile joints. Provide straight, aligned joints with tiles tightly butted together. Level acoustical ceiling to 1/8" in 12'-0"

Delete following article if not required.

3.5 EXPOSED SUSPENSION SYSTEM INSTALLATION:

A. Main runners directly suspended by minimum 12 gage galvanized steel wire; hanger wire wrapped tightly a minimum three full turns.

Select runner spacing option.

1. Runner Spacing: [24] [36] [48] [60] inches on center.

1. Runner Spacing: As indicated on Drawings.

1. Runner Spacing: [_______________________________].

Select hanger spacing option.

2. Hanger Spacing: [48] [60] inches on center.

2. Hanger Spacing: As indicated on Drawings.

2. Hanger Spacing: [________________________________].

B. Main runners interconnected by cross-tees to form modules as shown on reflected ceiling plans. Suitable cross-tee lengths adjacent to recessed light fixtures on each side not supported by a main runner.

Select cross-tee spacing option.

Cross-Tee Spacing: [24] [36] [48] [60] inches on center.

Cross-Tee Spacing: As indicated on Drawings.

Cross-Tee Spacing: [_________________________________].

C. Wall moldings installed wherever suspension components meet vertical surfaces. [Set into acoustical sealant bed] and firmly secure to substrates; [corners neatly mitered] [corner caps installed]

Provide trim molding around recessed light fixture openings.

D. Level acoustical ceiling to 1/8" in 12'-0" with maximum deflection of 1/360 of the span length in inches.

E. Joints and exposed suspension systems shall be straight and in alignment.

Delete following article if not required.

3.6 CONCEALED SUSPENSION SYSTEM INSTALLATION

A. Main runners directly suspended by minimum 12 gage galvanized steel wire; hanger wire wrapped tightly a minimum three full turns.

Select runner spacing option.

1. Runner Spacing [24] [36] [48] [60] inches on center.

1. Runner Spacing: As indicated on Drawings.

1. Runner Spacing: [______________________________]

Select hanger spacing option.

2. Hanger Spacing: [48] [60] inches on center.

2. Hanger Spacing: As indicated on Drawings.

2. Hanger Spacing: [___________________________]

B. Main runners interconnect by cross-tees to form modules. Suitable cross-tee lengths adjacent to recessed light fixtures on each side not supported by main runner.

Select cross-tee spacing option.

Cross-Tee Spacing: [24] [36] [48] [60] inches on center.

Cross Tee Spacing: As indicated on Drawings.

Cross-Tee Spacing: [_______________________________________].

Select module size option.

2. Module Size [______________] x [____________] inches.

2. Module Size: As indicated on Drawings.

C. Wall moldings installed wherever suspension components meet vertical surfaces; firmly secured with [corners neatly mitered] [corner caps installed]. Install spring spacers between wall moldings and adjacent ceiling tiles to prevent drift.

Provide trim molding to trim around recessed light fixture openings.

D. Flat tee splines, as required, placed between all ceiling tile kerfs not occupied by other components concurrently with installation of ceiling tile, except at points of direct initial access.

Select spline length option.

Spline Length: [24] [36] [48] [60] inches.

Spline Length: As indicated on Drawings.

Spline Length: [______________________________].

E. Access: At each point of direct initial access, following to replace tee splines:

Choose access option.

Upward Access: The necessary number of bottom access angles [24] [36] [48] [60] inches long with proper length and number of top access angles placed in ceiling tile kerfs to achieve specified amount of initial access.

Retain following for fire-rated installations with ceiling tiles weighing less than 1 lb./sq. ft.

Install proper number of fire rated access clips in kerfs of all adjacent initial access tiles and over top of corresponding adjacent component.

Downward Access: The necessary number of downward access tees [48] [___________] inches long with proper length and number of downward access angles placed in ceiling kerfs to achieve specified amount of initial access.

Retain following for fire-rated installations with ceiling tiles weighing less than 1 lb./sq. ft.

All downward access tees shall be [directly suspended at midpoint by not less than 12 gage galvanized steel wire] [interconnected at midpoint to closest parallel cross-tee or main runner with proper length spacer bar].

F. Level acoustical ceiling to 1/8' in 12'-0" with maximum deflection of 1/360 of the span length in inches.

3.7 ACOUSTICAL CEILING UNITS:

Delete following if not applicable.

A. Install acoustical ceiling units directionally as shown by reflected ceiling plans.

B. Install acoustical ceiling units in coordination with suspension system with edges supported on main runner and cross tee flanges. Support perimeter edges by wall moldings.

C. Neatly scribe acoustical ceiling units at abutting surfaces and at all penetrations or projections when wall moldings are not acceptable.

Delete following if not applicable.

D. Adhered Installation: Adhere tile to properly prepared substrates pursuant to CISCA recommendations. Install splines in tile joints. Provide straight, aligned joints with tiles tightly butted together. Level acoustical ceiling to 1/8" in 12'-0".

3.8 FIRE RATED ASSEMBLIES:

A. Comply with UL Design Number for acceptable component and hanger wire spacing, number and size of acoustical panels, fixture protection and other installation requirements.

Retain hold-down clips for fire-rated lay-in ceiling panels weighing less than 1 lb. per sq. ft.

B. Hold Down Clips: Two per locking cross-tee, for ceiling panels weighing less than 1 lb. per sq. ft. For access panels, substitute two accessible hold down clips.

3. 9 ADJUSTMENTS:

A. Make adjustments in ceiling system as necessary to ensure compliance with this specification.

B. Remove and replace damaged or soiled acoustical ceiling units.

3.10 CLEANING:

Remove debris which may have been caused during installation of this work.