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Lockdown® SPECIFICATION
Section 09545 Suspended Metal Panel Ceiling System
scope of work
submittals
field conditions
product components
finish
performance
material protection and installation
quality assurance
acceptable manufacturers
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1.1
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WORK INCLUDED: This specification covers the material,
installation, and related requirements for the Suspended Metal Acoustical Security
Panel Ceiling System including all necessary acoustical insulation, suspension systems,
and fasteners.
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1.2
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RELATED WORK: The following items of related work are not
included in this Section of the specifications.
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1.2.1
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Ceiling Lighting Systems; their components, layout, coordination,
installation, or support systems. Compatible recessed Security Lighting Fixtures
are to be furnished and installed by Division 16 Electrical.
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1.2.2
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Ceiling Air Supply and Return Systems; their components,
layout, coordination, installation, or support systems. Compatible Air supply and
return systems are to be furnished and installed by Division 15 Mechanical.
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2.1
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A manufacturer's certification of compliance with the acoustical
performance required under Section 6.2 of this specification.
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2.2
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Shop drawings shall be submitted and approved before fabrication
of the ceiling panels or their suspension systems.
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2.3
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1' x 1' assembled samples of each ceiling panel and its
suspension system.
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2.4
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Manufacturers' Product Data and Installation Instructions.
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3.0
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FIELD CONDITIONS: The ceiling
contractor shall verify all dimensions, elevations, and job site conditions before
installation commences.
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4.1
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SUSPENDED METAL PANEL CEILINGS: Ceiling panels shall be
nominally 24" x 24" (24" x 48") 1" deep with sloping vertical legs on all four sides.
All ceiling panels shall be factory formed from perforated 18 gauge minimum A60 galvanealled
steel. Where noted on the drawings for high humidity areas, the ceiling
panels shall be formed of .040" thick aluminum. All perforated panels shall have
.080" diameter holes on .220" staggered 45 degree centers. When installed, the face
of the panels shall rest on the inside surface of the exposed horizontal flanges
of the main runners and cross tees. The sloping vertical legs of the panels shall
lock-down positively and continuously under the bottom surface of the bulb of the
tee sections, providing a visual concealment barrier without the use of concealed
clips or fasteners.
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4.2
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SUPPORT SYSTEMS FOR SUSPENDED METAL PANEL CEILING: The
ceiling panel support system shall consist of main runners , cross tees, hanger
wires, perimeter channel with hold down, and compression struts.
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4.2.1
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MAIN RUNNERS AND CROSS TEES: Shall conform to the requirements
of a heavy-duty classification in accordance with ASTM C-635. They shall be rolled
with a double web and a rectangular bulb from Hot Dipped Galvanized steel, minimum
.020" thick, to an overall height of 1-1/2" with a flange width of 15/16".
The cross tees shall provide a positive mechanical lock into the main runners. If
an aluminum ceiling panel is used, the main runners and cross tees shall have a
white aluminum cap on exposed surfaces.
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4.2.2
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HANGERS: Supporting the main runners shall be 12 gauge
galvanized steel wire hung on minimum 48" centers from the structure above the
ceiling.
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4.2.3
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COMPRESSION STRUTS: Shall be composed of telescoping 1/2"
diameter and 3/4" diameter steel galvanized tubing. The 1/2" diameter tube shall
be notched on one end to fit over the bulb of the main runner. At the other end,
a length of 3/4" diameter tube is to be telescoped over the top portion of the 1/2"
diameter tube and screw fastened to it with two (2) 3/8" long TEK screws so that
the top of the 3/4" diameter tube bears on the structure above and the bottom of
the 1/2" diameter tube fits snugly over the bulb of the main runner. A compression
strut is required at each hanger wire and shall be tied to the hanger wire at the
top and bottom.
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4.2.4
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WALL MOLDINGS: Exposed wall moldings shall be channel shaped
and be of the same material and have the same finish as the suspension system runners
and shall include closure channels to hold perimeter panels in place.
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4.2.5
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FASTENERS: All exposed fasteners shall be tamper proof
and shall be a minimum No. 12 size. Fasteners are to be selected and furnished by
the contractor and approved by the architect/engineer.
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4.3
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ACOUSTICAL MATERIAL: The inside surface of all perforated
ceiling panels shall be covered with Class "A" fiberglass insulation wrapped
in black Fire Retardant Poly. Insulation shall be of sufficient thickness and density
to provide the acoustical requirements as outlined in Section 6.2 of this specification.
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4.4
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LIGHTS AND AIR: Although not furnished by the ceiling system
manufacturer, all light and air units are to be system compatible and sized so as
to fit into and trim off full module opening and shall be independently supported
from the structure above by the installing trade.
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5.1
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CEILING PANELS: The metal panels shall have a Polyester
Powder Coated Paint finish factory applied after perforation to ensure coating of
perforated holes. Panels shall be coated with white polyester powder to a thickness
min 2.0 mil. Before painting, galvanealled steel or aluminum surfaces shall be cleaned,
rinsed, and properly treated to receive the finish. Finish to achieve the following
performance characteristics : Salt Spray per ASTM B-117 - 1000 hours PASS at less
than 1/8" from score; Humidity Resistance per ASTM D-2247 - 1000 hours PASS at less
than 1/8" from score.
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5.2
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SUSPENSION SYSTEMS: The main runners, cross tees, and wall
moldings shall have a factory applied finish coat to match the color of the ceiling
panels.
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6.1
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ACCESSIBILITY: Suspended metal panel ceiling systems shall
be designed and installed to resist access to the plenum area above except through
pre-designated removable ceiling panels which shall be secured to the suspension
system with tamper proof screws. System compatible, hinged, locking, downward accessible
doors are to be provided in locations indicated on architectural reflected ceiling
plans.
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6.2
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ACOUSTICAL REQUIREMENTS: The ceiling systems shall provide
a noise reduction co-efficient (NRC) of not less than .80 when tested in accordance
with ASTM C423-84a in an E-400 mounting as defined in ASTM E795-83.
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7.1
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MATERIAL PROTECTION: Material shall not be delivered to
the job site, nor installed, until all exterior openings have been closed in and
all concrete and other wet work is completed and dry.
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7.2
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SITE INSPECTION: Prior to installation of the ceiling systems,
the general contractor shall verify that the structure and surfaces provided by
other trades are properly built to the dimensions shown on the approved ceiling
shop drawings and that the structure is ready to receive the ceiling system. All
discrepancies shall be corrected prior to commencing installation.
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7.3
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INSTALLATION: The ceiling system shall be installed in
accordance with ASTM C636 in layouts as reflected on the approved shop drawings,
all in compliance with the manufacturer's installation instructions. The suspension
system and wall moldings shall be installed plumb and level. Except for the openings
for light, air, fire protection, or access shown on the reflected ceiling plans,
all openings or cut-outs required in the ceiling panels shall be field cut by the
trades requiring the openings.
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8.1
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MANUFACTURER QUALIFICATIONS: Company specializing and regularly
engaged in the domestic manufacture of metal panel security ceilings with a minimum
of five (5) years experience in the manufacture of ceiling systems for Justice Facilities.
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8.2
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ERECTOR QUALIFICATIONS: Company specializing in the installation
of metal acoustical ceilings, approved by the manufacturer, and having a minimum
of three (3) years experience in the installation of ceiling systems for Justice
Facilities
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8.3
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SINGLE SOURCE RESPONSIBILITY. To insure proper compatibility,
all ceiling components listed in Section 4.0 Product Components, shall be provided
by a single source.
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9.1
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SUSPENDED METAL SECURITY PANEL CEILING SYSTEM: Shall be
Lockdown® as manufactured by Gordon Corrections Division, Bossier City, LA, 866-733-3851, or equal as approved by architect in accordance with Paragraph
9.2 below.
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9.2
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SUBSTITUTIONS: Ceiling systems by other manufacturers may
be substituted only after written approval of the architect, such approval being
received ten (10) calendar days prior to the bid opening. The proposed system shall
meet all the requirements of this specification.
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