09511.pdf

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ACOUSTICAL PANEL CEILINGS 09511 - 1

SECTION 09511 - ACOUSTICAL PANEL CEILINGS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes ceilings composed of acoustical panel ceilings installed with exposed suspension systems.

1. Provide acoustical panel ceilings as scheduled and specified.

B. Related Sections: The following Sections contain requirements that relate to this Section:

1. Division 15 Sections for grilles, registers and diffusers in acoustical ceilings.

2. Division 16 Sections for lighting fixtures in acoustical ceilings.

1.3 SUBMITTALS

A. Product data for each type of product specified including installation instructions for each acoustical ceiling material required, and for each suspension system, including certified laboratory test reports and other data as required to show compliance with these specifications.

1. Include manufacturer’s recommendations for cleaning and refinishing acoustical units, including precautions against materials and methods which may be detrimental to finishes and acoustical performances.

B. Samples for verification of each type of exposed finish required, prepared on samples of size indicated below. Where finishes involve normal color and texture variations, include sample sets showing the full range of variations expected.

1. Full-size samples of each acoustical panel type, pattern, and color required.

2. Set of 12-inch-long samples of exposed suspension system members, including moldings, for each color and system type required.

C. Product test reports from a qualified independent testing agency that are based on its testing of current products for compliance of acoustical panel ceilings and components with requirements.

1.4 QUALITY ASSURANCE

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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. Fire-Test-Response Characteristics: Provide acoustical panel ceilings that comply with the following requirements:

1. Fire-response tests are performed by a qualified testing and inspecting agency. Qualified testing and inspecting agencies include Underwriters Laboratories (UL), Warnock Hersey, or another 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.

a. Flame Spread: 25 or less.

b. Smoke Developed: 50 or less.

C. Single-Source Responsibility for Ceiling Units: Obtain each type of acoustical ceiling panel from a single source with resources to provide products of consistent quality in appearance and physical properties without delaying the Work.

D. Single-Source Responsibility for Suspension System: Obtain each type of suspension system from a single source with resources to provide products of consistent quality in appearance and physical properties without delaying the Work.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Deliver acoustical panels and suspension system components to Project site in original, unopened packages and store them in a fully enclosed space where they will be protected against damage from moisture, direct sunlight, surface contamination, and other causes.

B. Before installing acoustical panels, permit them to reach room temperature and a stabilized moisture content.

C. Handle acoustical panels carefully to avoid chipping edges or damaging units in any way.

1.6 PROJECT CONDITIONS

A. Space Enclosure and Environmental Limitations: Do not install acoustical panel ceilings until spaces are enclosed and weatherproof, wet-work in spaces is completed and dry, work above ceilings is complete, and ambient temperature and humidity conditions are being maintained at the levels indicated for Project when occupied for its intended use.

1.7 COORDINATION

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A. Coordinate layout and installation of acoustical panels and suspension system components with other construction that penetrates ceilings or is supported by them, including light fixtures, HVAC equipment, fire-suppression system components (if any), and partition assemblies (if any).

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Products: Subject to compliance with requirements, provide one of the following for each panel type indicated:

1. Mineral Base Panels (Type C1) - Water-Felted, with Painted Finish and Perforated and Fissured Pattern, Non-Fire-Resistance Rated:

a. Basis-of-Design Product: “Cortega, #704”; Armstrong World Industries, Inc.

2. Mineral Base Panels (Type C2) - Ceramic Base Panels with Scrubbable Finish and

Perforated Pattern Non-Fire-Resistance Rated:

a. Basis-of-Design Product: “Ceramaguard Perforated”; Armstrong World Industries, Inc.

3. Subject to compliance with requirements, provide the Basis-of-Design products or a comparable product by one of the following manufacturers:

a. Armstrong World Industries, Inc.

b. Chicago Metallic Corporation.

c. USG Interiors, Inc.

2.2 ACOUSTICAL PANELS, GENERAL

A. Acoustical Panel Standard: Provide manufacturer's standard panels of configuration indicated that comply with ASTM E 1264 classifications as designated by types, patterns, acoustical ratings, and light reflectances, unless otherwise indicated.

B. Acoustical Panel Colors and Patterns: Match appearance characteristics indicated for each product type.

2.3 MINERAL-BASE ACOUSTICAL PANELS - WET FORMED, NON FIRE-RESISTANCE

RATED

A. Panel Characteristics: Type III, Form 2, Pattern C D, acoustical panels per ASTM E 1264, with painted finish, complying with pattern and other requirements indicated below:

1. Pattern: Panels matching pattern indicated by reference to manufacturer's standard product

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designations in "Manufacturers" Article.

2. Color/Light Reflectance Coefficient: White/LR 0.82.

3. Noise Reduction Coefficient: NRC 0.55.

4. CAC: Minimum 33.

5. Edge Detail: Tegular Lay-in.

6. Thickness: 5/8 inch.

7. Size: 24 by 24 inches.

8. Surface Burning Characteristics: Class A.

B. Suspension System Type: As described below and specified in Part 2 "Non-Fire-Resistance-

Rated, Direct-Hung Suspension Systems" Article:

1. Wide-Face, Capped, Double-Web, Steel Suspension System.

2.4 HIGH-DENSITY, CERAMIC-BASE PANELS WITH SCRUBBABLE FINISH (TYPE B)

A. Panel Characteristics: Type XX units per ASTM E 1264 resistant to heat, moisture, and corrosive fumes and complying with pattern and other requirements indicated.

1. Pattern: Panels matching pattern indicated by reference to manufacturer’s standard product designations in “Manufacturers” Article.

2. Color/Light Reflectance Coefficient: White/LR 0.82.

3. Noise Reduction Coefficient: NRC .55 (perforated).

4. Ceiling Attenuation Class: Minimum 38 CAC.

5. Edge Detail: Square-cut lay-in.

6. Size: 24 inches by 24 inches x 5/8 inch and as indicated and required.

7. Surface Burning Characteristics: Class A.

8. Environmental Characteristics: Moisture resistant, heat resistant, steam resistant and chemical resistant with no visible sag under conditions not to exceed 100o F and 100% humidity.

B. Suspension System Type: As described below and specified in Part 2 “Non-Fire-Resistance- Rated, Direct Hung Suspension Systems” Article.

1. Wide-Faced, Aluminum-Capped, Double-Web, Hot-Dip Galvanized-Steel Suspension

System.

2.4 METAL SUSPENSION SYSTEMS, GENERAL

A. Metal Suspension System Standard: Provide manufacturer's standard metal suspension systems of types, structural classifications, and finishes indicated that comply with applicable ASTM C 635 requirements.

B. Finishes and Colors: Provide manufacturer's standard factory-applied finish for type of system indicated.

C. Attachment Devices: Size for 5 times the design load indicated in ASTM C 635, Table 1, Direct

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Hung unless otherwise indicated.

D. Wire Hangers, Braces, and Ties: Provide wires complying with the following requirements:

1. Zinc-Coated Carbon Steel Wire: ASTM A 641, Class 1 zinc coating, soft temper.

E. Hanger Rods: Mild steel, zinc coated, or protected with rust-inhibitive paint.

F. Flat Hangers: Mild steel, zinc coated, or protected with rust-inhibitive paint.

G. Angle Hangers: Angles with legs not less than 7/8 inch wide, formed with 0.0396-inch-(1 mm)-thick galvanized-steel sheet complying with ASTM A 446, G 90 Coating Designation, with bolted connections and 5/16-inch-diameter bolts.

H. Sheet-Metal Edge Moldings and Trim: Manufacturer's standard moldings for edges and penetrations that fit acoustical panel edge details and suspension systems indicated; formed from sheet metal of same material and finish as that used for exposed flanges of suspension system runners.

2.5 NON-FIRE-RESISTANCE-RATED, DIRECT-HUNG SUSPENSION SYSTEMS

A. Wide-Face, Capped, Double-Web, Steel Suspension System: Main and cross runners roll formed from pre-painted or electrolytic zinc-coated, cold-rolled steel sheet, with prefinished 15/16 -inch wide metal caps on flanges; other characteristics as follows:

1. Structural Classification: Intermediate-duty system.

2. End Condition of Cross Runners: Override (stepped) or butt-edge type, as standard with manufacturer.

3. Cap Material and Finish: Steel sheet painted white.

4. Application: Use where Type “A” ceilings are scheduled.

B. Wide-Faced, Aluminum-Capped, Double-Web, Hot-Dip Galvanized-Steel Suspension System:

Main and cross runners roll formed from hot-dip galvanized, cold-rolled steel sheet, with prefinished 15/16-inch wide aluminum caps on flanges; other characteristics as follows:

1. Structural Classification: Intermediate-duty system.

2. Zinc Coating: ASTM A 525, G 60 (ASTM A 525M, Z 180).

3. High-Humidity Finish: Comply with ASTM C 635 for “Coating Classification for Severe

Environmental Performance.”

4. Finish: Painted white.

5. Application: Use where Type “B” ceilings are scheduled.

C. Products: Subject to compliance with requirements, provide one of the following:

1. Wide-Faced, Capped, Double-Web, Steel Suspension Systems:

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a. Prelude 15/16: Exposed Tee System; Armstrong World Industries, Inc.

b. DX24 System; USG Interiors, Inc.

2. Wide-Face, Aluminum-Capped, Double-Web, Hot-Dip Galvanized-Steel Suspension

Systems:

a. HD Prelude Plus; Armstrong World Industries, Inc.

b. Environmental ZXA 24 Grid System: USG Interiors, Inc.

2.6 ACOUSTICAL SEALANT

A. Acoustical Sealant for Exposed and Concealed Joints: Manufacturer's standard non-sag, paintable, nonstaining latex sealant complying with ASTM C 834 and the following requirements:

1. Product is effective in reducing airborne sound transmission through perimeter joints and openings in building construction as demonstrated by testing representative assemblies per

ASTM E 90.

2. Product has flame-spread and smoke-developed ratings of less than 25 per ASTM E 84.

B. Acoustical Sealant for Concealed Joints: Manufacturer's standard nondrying, nonhardening, non-skinning, nonstaining, gunnable, synthetic rubber sealant recommended for sealing interior concealed joints to reduce transmission of airborne sound.

C. Products: Subject to compliance with requirements, provide one of the following:

1. Acoustical Sealant for Exposed Joints:

a. AC-20 FTR Acoustical and Insulation Sealant; Pecora Corp.

b. SHEETROCK Acoustical Sealant; United States Gypsum Company.

2. Acoustical Sealant for Concealed Joints:

a. BA-98; Pecora Corp.

b. Tremco Acoustical Sealant; Tremco, Inc.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates and structural framing to which acoustical panel ceilings attach or abut, with

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Installer present, for compliance with requirements specified in this and other Sections that affect ceiling installation and anchorage. Do not proceed with installation until unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Coordination: Furnish layouts for cast-in-place anchors, clips, and other ceiling anchors whose installation is specified in other Sections.

1. Furnish anchors and similar devices to other trades for installation well in advance of time needed for coordinating other work.

B. Measure each ceiling area and establish the layout of acoustical panels to balance border widths at opposite edges of each ceiling. Avoid using less-than-half-width panels at borders, and conform to the layout shown on reflected ceiling plans.

3.3 INSTALLATION

A. General: Install acoustical panel ceilings to comply with publications referenced below per manufacturer's instructions and CISCA "Ceiling Systems Handbook."

1. Standard for Ceiling Suspension System Installations: Comply with ASTM C 636.

B. Suspend ceiling hangers from building's structural members and as follows:

1. Install hangers plumb and free from contact with insulation or other objects within ceiling plenum that are not part of the supporting structure or of the ceiling suspension system.

2. Splay hangers only where required to miss obstructions; offset resulting horizontal forces by bracing, countersplaying, or other equally effective means.

3. Where width of ducts and other construction within ceiling plenum produces hanger spacings that interfere with the location of hangers at spacings required to support standard suspension system members, install supplemental suspension members and hangers in the form of trapezes or equivalent devices. Size supplemental suspension members and hangers to support ceiling loads within performance limits established by referenced standards and publications.

a. Hanger wires shall not penetrate ductwork.

4. Secure wire hangers to ceiling suspension members and to supports above with a minimum of 3 tight turns. Connect hangers either directly to structures or to inserts, eye screws, or other devices that are secure, that are appropriate for substrate, and that will not deteriorate or otherwise fail due to age, corrosion, or elevated temperatures.

5. Secure flat, angle, channel, and rod hangers to structure, including intermediate framing members, by attaching to inserts, eye screws, or other devices that are secure and appropriate for both the structure to which hangers are attached and the type of hanger

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involved. Install hangers in a manner that will not cause them to deteriorate or fail due to age, corrosion, or elevated temperatures.

6 Do not attach hangers to steel deck. Attach hangers to structural members.

7 Space hangers not more than 48 inches o.c. along each member supported directly from hangers, unless otherwise shown; and provide hangers not more than 8 inches from ends of each member.

C. Install edge moldings and trim of type indicated at perimeter of acoustical ceiling area and where necessary to conceal edges of acoustical panels.

1. Apply acoustical sealant in a continuous ribbon concealed on back of vertical legs of moldings before they are installed.

2. Screw attach moldings to substrate at intervals not over 16 inches o.c. and not more than 3 inches from ends, leveling with ceiling suspension system to a tolerance of 1/8 inch in 12 feet. Miter corners accurately and connect securely.

3. Do not use exposed fasteners, on moldings and trim.

D. Install suspension system runners so they are square and securely interlocked with one another.

Remove and replace dented, bent, or kinked members.

E. Install acoustical panels with undamaged edges and fitted accurately into suspension system runners and edge moldings. Scribe and cut panels at borders and penetrations to provide neat, precise fit.

1. Arrange directionally patterned acoustical panels as follows:

a. Install panels with pattern running in one direction.

2. For square-edged panels, install panels with edges fully hidden from view by flanges of suspension system runners and moldings.

3.4 CLEANING

A. Clean exposed surfaces of acoustical panel ceilings, including trim, edge moldings, and suspension system members. Comply with manufacturer's instructions for cleaning and touchup of minor finish damage. Remove and replace ceiling components that cannot be successfully cleaned and repaired to permanently eliminate evidence of damage.

END OF SECTION 09511