36C24419B0044-016.docx

12-01-18

SECTION 09 51 00

ACOUSTICAL CEILINGS

GENERAL

SUMMARY

Section Includes:

Acoustical units.

APPLICABLE PUBLICATIONS

Comply with references to extent specified in this section.

ASTM International (ASTM):

A641/A641M09a(2014) - Zinccoated (Galvanized) Carbon Steel Wire.

A653/A653M15e1 - Steel Sheet, ZincCoated (Galvanized) or ZincIron Alloycoated (Galvannealed) by the HotDip Process.

C42309a - Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method.

C63413 - Terminology Relating to Environmental Acoustics.

C635/C635M13a - Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Layin Panel Ceilings.

C636/C636M13 - Installation of Metal Ceiling Suspension Systems for Acoustical Tile and Layin Panels.

D177998(2011) - Adhesive for Acoustical Materials.

E8415b - Surface Burning Characteristics of Building Materials.

E11916 - Fire Tests of Building Construction and Materials.

E41316 - Classification for Rating Sound Insulation.

E580/E580M14 - Installation of Ceiling Suspension Systems for Acoustical Tile and Layin Panels in Areas Subject to Earthquake Ground Motions.

E126414 - Classification for Acoustical Ceiling Products.

International Organization for Standardization (ISO):

ISO 146441 - Classification of Air Cleanliness.

QUALITY ASSURANCE

Manufacturer Qualifications:

Regularly manufactures specified products.

Manufactured specified products with satisfactory service on five similar installations for minimum five years.

DELIVERY

Deliver products in manufacturer's original sealed packaging.

Mark packaging, legibly. Indicate manufacturer's name or brand, type, production run number, and manufacture date.

Before installation, return or dispose of products within distorted, damaged, or opened packaging.

STORAGE AND HANDLING

Store products indoors in dry, weathertight facility.

Protect products from damage during handling and construction operations.

FIELD CONDITIONS

Environment:

Product Temperature: Minimum 21 degrees C (70 degrees F) for minimum 48 hours before installation.

Work Area Ambient Conditions: HVAC systems are complete, operational, and maintaining facility design operating conditions continuously, beginning 48 hours before installation until Government occupancy.

Install products when building is permanently enclosed and when wet construction is completed, dried, and cured.

WARRANTY

Construction Warranty: FAR clause 52.24621, "Warranty of Construction."

PRODUCTS

SYSTEM DESCRIPTION

Ceiling System: Acoustical ceilings units on exposed grid suspension systems.

SYSTEM PERFORMANCE

Design product complying with specified performance:

Maximum Deflection: 1/360of span, maximum.

Surface Burning Characteristics: When tested according to ASTM E84.

Flame Spread Rating: 25 maximum.

Smoke Developed Rating: 450 maximum.

PRODUCTS - GENERAL

Provide acoustical units from one manufacturer.

Provide each product exposed to view from one production run.

Provide suspension system from same manufacturer.

ACOUSTICAL UNITS

General:

Ceiling Panel and Tile: ASTM E1264, biobased content according to USDA BioPreferred Product requirements.

Mineral Fiber: 3.6 kg/sq. m (3/4 psf) weight, minimum.

METAL SUSPENSION SYSTEM

General: ASTM C635.

Suspension System: Provide the following:

Galvanized coldrolled steel, bonderized.

Main and Cross Runner: Use same construction Do not use lighterduty sections for cross runners.

Exposed Grid Suspension System: Support of layin panels.

Grid Width: 22 mm (7/8 inch) minimum with8 mm (5/16 inch) minimum panel bearing surface.

Molding: Fabricate from the same material with same exposed width and finish.

Finish: Bakedon enamel flat texture finish.

Color: To match adjacent acoustical units unless specified otherwise in Section 09 06 00, SCHEDULE FOR FINISHES.

Concealed Grid Suspension System: Mineral base acoustical tile support.

Concealed grid upward access suspension system initial opening, 300 mm by 600 mm (12 by 24 inches).

Flange Width: 22 mm (7/8 inch) minimum except:

Access Hook and Angle: 11 mm (7/16 inch) minimum.

Suspension System Support of Metal Type V, VI, and VII Tiles: Concealed grid type with runners for snapin attachment of metal tile (pans).

Carrying Channels Secondary Framing: Coldrolled or hotrolled steel, black asphaltic paint finish, rust free.

Weight per 300 m (per thousand linear feet), minimum:

Anchors and Inserts: Provide anchors or inserts to support twice the loads imposed by hangers.

Hanger Inserts: Steel, zinccoated (galvanized after fabrication).

Clips: Galvanized steel, designed to secure framing member in place.

Tile Splines: ASTM C635.

Wire: ASTM A641.

Size:

Wire Hangers: Minimum diameter 2.68 mm (0.1055 inch).

Bracing Wires: Minimum diameter 3.43 mm (0.1350 inch).

ACCESSORIES

Adhesives: Low pollutant-emitting, water based type recommended by adhered product manufacturer for each application.

Perimeter Seal: Vinyl, polyethylene or polyurethane open cell sponge material, density of 1.3 plus or minus 10 percent, compression set less than 10 percent with pressure sensitive adhesive coating on one side.

Thickness: As required to fill voids between back of wall molding and finish wall.

Size: Minimum 9 mm (3/8 inch) wide strip.

EXECUTION

PREPARATION

Examine and verify substrate suitability for product installation.

Protect existing construction and completed work from damage.

Remove existing acoustical panels and suspension system to permit new installation.

Retain existing acoustical panels and suspension system for reuse.

Dispose of other removed materials.

INSTALLATION - GENERAL

Install products according to manufacturer's instruction.

When manufacturer's instructions deviate from specifications, submit proposed resolution for Contracting Officer's Representative consideration.

ACOUSTICAL UNIT INSTALLATION

Applications:

Cut acoustic units for perimeter borders and penetrations to fit tight against penetration for joint not concealed by molding.

Layout acoustical unit symmetrically, with minimum number of joints.

Installation:

Install acoustic tiles after wet finishes have been installed and solvents have cured.

Install layin acoustic panels in exposed grid with minimum 6 mm (1/4 inch) bearing at edges on supports.

Install tile to lay level and in full contact with exposed grid.

Replace cracked, broken, stained, dirty, or tile.

Tile in concealed grid upward access suspension system:

Install acoustical tile with joints close, straight and true to line, and with exposed surfaces level and flush at joints.

Make corners and arises full, and without worn or broken places.

Locate acoustical units providing access to service systems.

Adhesive applied tile:

Condition of surface according to ASTM D1779, Note 1, Cleanliness of Surface, and Note 4, Rigidity of Base Surface.

Size or seal surface as recommended by manufacturer of adhesive and allow to dry before installing units.

Touch up damaged factory finishes.

Repair painted surfaces with touch up primer.

CEILING SUSPENSION SYSTEM INSTALLATION

General: Install according to ASTM C636.

Use direct or indirect hung suspension system or combination of both.

Support a maximum area of 1.48 sq. m (16 sq. ft.) of ceiling per hanger.

Prevent deflection in excess of 1/360 of span of cross runner and main runner.

Provide additional hangers located at each corner of support components.

Provide minimum 100 mm (4 inch) clearance from the exposed face of the acoustical units to the underside of ducts, pipe, conduit, secondary suspension channels, concrete beams or joists; and steel beam or bar joist unless furred system is shown.

Provide main runners minimum 1200 mm (48 inches) in length.

Install hanger wires vertically. Angled wires are not acceptable except for seismic restraint bracing wires.

Direct Hung Suspension System: ASTM C635.

Support main runners by hanger wires attached directly to the structure overhead.

Maximum spacing of hangers, 1200 mm (4 feet) on centers unless interference occurs by mechanical systems. Use indirect hung suspension system where not possible to maintain hanger spacing.

Anchorage to Structure:

Concrete:

Install hanger inserts and wire loops required for support of hanger wire. Install hanger wires with looped ends through steel deck when steel deck does not have attachment device.

Use eye pins or threaded studs with screwon eyes in existing or already placed concrete structures to support hanger wire. Install in sides of concrete beams or joists at mid height.

Steel:

Install carrying channels for attachment of hanger wires.

Size and space carrying channels to support load within performance limit.

Attach hangers to steel carrying channels, spaced four feet on center, unless area supported or deflection exceeds the amount specified.

Attach carrying channels to the bottom flange of steel beams spaced not 1200 mm (4 feet) on center before fireproofing is installed. Weld or use steel clips for beam attachment.

Attach hangers to bottom chord of bar joists or to carrying channels installed between the bar joists when hanger spacing prevents anchorage to joist. Rest carrying channels on top of the bottom chord of the bar joists, and securely wire tie or clip to joist.

Indirect Hung Suspension System: ASTM C635.

Space carrying channels for indirect hung suspension system maximum 1200 mm (4 feet) on center. Space hangers for carrying channels maximum 2400 mm (8 feet) on center or for carrying channels less than 1200 mm (4 feet) or center so as to insure that specified requirements are not exceeded.

Support main runners by specially designed clips attached to carrying channels.

CEILING TREATMENT

Moldings:

Install metal wall molding at perimeter of room, column, or edge at vertical surfaces.

Install special shaped molding at changes in ceiling heights and at other breaks in ceiling construction to support acoustical units and to conceal their edges.

Perimeter Seal:

Install perimeter seal between vertical leg of wall molding and finish wall, partition, and other vertical surfaces.

Install perimeter seal to finish flush with exposed faces of horizontal legs of wall molding.

Existing ceiling:

Where extension of existing ceilings occurs, match existing.

Where acoustical units are salvaged and reinstalled or joined, use salvaged units within a space. Do not mix new and salvaged units within a space which results in contrast between old and new acoustic units.

Comply with specifications for new acoustical units for new units required to match appearance of existing units.

CLEANING

Remove excess adhesive before adhesive sets.

Clean exposed surfaces. Remove contaminants and stains.

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