09 51 00 Bldg 1 ADC Acoustical Ceilings.docx

VA Western New York Healthcare System 3495 Bailey Avenue Building 1 Abatement, Demo, and Construction Buffalo, NY 14215

SECTION 09 51 00

ACOUSTICAL CEILINGS

GENERAL

SUMMARY

Section Includes:

Acoustical units.

Metal ceiling suspension system for acoustical ceilings.

Adhesive application.

RELATED REQUIREMENTS

Ceiling Suspension System: Section 09 22 16, NONSTRUCTURAL METAL FRAMING.

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.

PREINSTALLATION MEETINGS

Conduct preinstallation meeting at project site minimum 30 days before beginning Work of this section.

Required Participants:

Contracting Officer's Representative.

Architect/Engineer Contractor.

Installer.

INSTALLATION - GENERAL

Install products according to manufacturer's instructions and provided drawing.

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.

Markers:

Install color coded markers to identify the various concealed piping, mechanical, and plumbing systems.

Attach colored markers to exposed grid on opposite sides of the units providing access.

Attach marker on exposed ceiling surface of upward access acoustical unit.

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 and bracing 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 and bracing 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.

Seismic Ceiling Bracing System:

Install according to ASTM E580.

Connect bracing wires to structure above as specified for anchorage to structure and to main runner or carrying channels of suspended ceiling at bottom.

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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