PART 1 - GENERAL
1.01
GENERAL REQUIREMENTS
A. Attention is directed to the Contract and General conditions and all Sections
within Division 1 – GENERAL REQUIREMENTS, which are hereby made a part
of this Section of the Specifications.
B. Examine all other Sections of the Specifications for requirements that affect work
of this Section whether or not such work is specifically mentioned in this Section.
C. Coordinate work with that of all other trades affecting, or affected by work of this
Section. Cooperate with such trades to assure the steady progress of all work
under the Contract.
1.02
SUMMARY
A. This Section includes the following:
1. Rooftop acoustical screens.
B. Related Sections include the following:
1. Section 05120 – STRUCTURAL STEEL, for steel elements for support of
acoustical screens in addition to those specified herein.
2. Section 07530 – EPDM MEMBRANE ROOFING, for roofing, membrane
flashing and associated materials.
3. Section xxxxx – xxxxx
1.03
PERFORMANCE REQUIREMENTS
A. Structural Performance: Provide screens capable of withstanding the effects of
gravity loads and the following loads and stresses within limits and under
conditions indicated without permanent deformation of acoustical screen
components, noise or metal fatigue caused by acoustical screen blade rattle or
flutter, or permanent damage to fasteners and anchors. Wind pressures shall be
considered to act on vertical projection of acoustical screens.
1. Wind Loads: Determine loads based on a uniform pressure of 35 lbs./sq. ft.
(1675 Pa), acting inward or outward.
B. Seismic Performance: Provide acoustical screens capable of withstanding the
effects of earthquake motions determined according to Massachusetts State
Building Code.
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C. Thermal Movements:
Provide acoustical screens that allow for thermal
movements resulting from the following maximum change (range) in ambient and
surface temperatures by preventing buckling, opening of joints, overstressing of
components, failure of connections, and other detrimental effects. Base
engineering calculation on surface temperatures of materials due to both solar
heat gain and nighttime-sky heat loss.
1. Temperature Change (Range): 120 deg. F. (67 deg. C), ambient; 180 deg.
F. (100 deg. C), material surfaces.
D. Airborne Sound Transmission Loss: Provide acoustical screens complying with
airborne sound transmission loss ratings indicated, as demonstrated by testing
manufacturer’s stock units identical to those specified, except for length and
width.
1. Airborne Sound Transmission Loss: STC 42 and the following minimum
sound transmission loss values per ASTM E 413, determined by testing per
ASTM E 90.
Frequency
(Hz)
63
125
250
500
1000
2000
4000
8000
Transmission
Loss
21
21
30
41
52
59
64
67
2.
1.04
Noise Reduction Coefficient: NRC 1.0 and the following minimum sound
absorption coefficients per ASTM C 423:
Frequency (Hz)
63
125
250
500
1000
2000
4000
8000
Absorption
Coefficient
.18
.75
1.02
1.07
.98
.89
.80
.86
SUBMITTALS
A. Prepare and submit the following submittals in accordance with the requirements
of Section 01300 – Submittals.
B. Product Data: For each type of product indicated.
C. Shop Drawings: For acoustical screens and accessories. Include plans,
elevations, sections, details, and attachments to other Work. Show panel profiles
and spacing.
1. For installed acoustical screens indicated to comply with design loads,
include structural analysis data signed and sealed by the qualified
professional engineer responsible for their preparation.
D. Samples for Initial Selection: For units with factory-applied color finishes.
E. Samples for Verification: For each type of metal finish required.
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F. Product Test Reports: Based on evaluation of comprehensive tests performed
by an independent qualified testing agency or by manufacturer and witnessed by
a qualified independent testing agency, for each type of acoustical screen.
G. Erector Certificate: Signed by acoustic screen manufacturer certifying that
Erector is approved, authorized, or licensed by manufacturer to install acoustical
screen.
H. Manufacturer Certificate: Signed by manufacturer certifying that products comply
with requirements.
1.05
QUALITY ASSURANCE
A. Erector Qualifications: An experienced erector who has specialized in erecting
and installing work similar in material, design, and extent to that indicated for this
Project and who is acceptable to manufacturer.
B. Engineering Responsibility: Preparation of Shop Drawings and comprehensive
engineering analysis by a qualified professional engineer.
C. Welding: Qualify procedures and personnel according to the following:
1. AWS D1.3, “Structural Welding Code – Sheet Steel.”
D. SMACNA Standard: Comply with recommendations in SMACNA’s “Architectural
Sheet Metal Manual” for fabrication, construction details, and installation
procedures.
E. Inspector Qualifications: The acoustical screen installation shall be inspected by
a representative of the approved acoustical screen manufacturer fully qualified to
perform inspections.
1.06
PROJECT CONDITIONS
A. Field Measurements:
Verify acoustical screen dimensions by field
measurements before fabrication and indicate measurements on Shop Drawings.
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PART 2 - PRODUCTS
2.01
MANUFACTURERS
A. Available Manufacturers:
Subject to compliance with requirements,
manufacturers offering products that may be incorporated into the Work include,
but are not limited to, the following:
1. Acoustical screens:
a. George Koch Sons, LLC Evansville, IN
812-465-9771ddh@kochllc.com
b. Approved substitution
c. Approved substitution
B. Basis-of-Design Product: The design for the acoustical screens for this Project is
based on Koch Acoustical Barriers manufactured by Koch Sons, LLC. Subject to
compliance with requirements, provide either the named product or a comparable
product by one of the other manufacturers specified.
2.02
MATERIALS
A. Galvanized Steel Sheet: ASTM A 653/A 653M, G90 (Z275) zinc coating, mill
phosphatized.
B. Steel shapes, plates and bars shall conform to the requirements of Standard
Specification for Steel for Bridges and Buildings, ASTM A36.
C. Fasteners for Acoustical Panels: Self-tapping screws, bolts, nuts, self-locking
rivets and bolts, end-welded studs, and other suitable fasteners designed to
withstand design loads.
1. Self-drilling Type 410 stainless steel or self-tapping Type 304 stainless steel
or zinc-alloy-steel hex washer head, with EPDM or PVC washer under
heads of fasteners bearing on weather side of metal panels.
2. Steel bolts and nuts shall conform to ASTM B-6.
D. Non-Shrink Grout: Hydraulic cement for installing bolts and fastenings into
masonry and concrete and for setting pipe posts into sleeves and cements; quick
setting, non-staining, non-shrinking exterior type, as approved.
E. Bituminous Paint: Cold-applied asphalt emulsion complying with ASTM D 1187.
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2.03
ACOUSTICAL PANELS
A. Formed metal sound barrier and absorption panels: Partially perforated, formed
metal panels with acoustical insulation core, secured to steel frame.
1. Panel Dimensions:
a. Width: 33 inches (838 mm).
b. Length: As shown on Drawings
c. Depth: 4 inch (102 mm).
B. Construction: Exterior and interior galvanized steel shells mechanically fastened
and spot-welded to internal channel frame.
1. Internal Frame: Galvanized steel channels with configuration and spacing
required to comply with structural requirements.
2. Vertical Edges: Provide roll-formed edge profile for tongue-and-groove
joints between adjacent panels.
C. Solid Exterior Shell: Roll-formed, galvanized steel sheet, of thickness required to
comply with structural performance requirements, but not less than 0.048-inch
(1.2 mm) nominal thickness (18 gauge).
D. Perforated Interior Shell: Roll-formed, galvanized steel sheet, of thickness
required to comply with structural performance requirements, but not less than
0.030-inch (0.76 mm) nominal thickness (22 gauge).
1. Perforations: 3/32-inch (2.4 mm) diameter perforations, staggered spacing
3/16-inch (4.8 mm) on center.
E. Cap: Factory formed channel formed to cover top surface of top panel, with
powder coat finish to match panels.
F. Base: Factory formed channel to cover bottom surface of panel with weep
penetrations for self drainage, powder coat finished to match panels.
G. Corner: Factory-formed corner trim powder coat finished to match panels.
H. Accessories: Manufacturer’s standard accessories and trim as required for
complete installation.
I. Acoustical Insulation: Mineral-fiber, rigid-board insulation in conformance with
HH-1-558B and ASTM E-136, and with the following properties:
1. Density: 4 pounds per cubic foot.
2. Water Absorption: Less than 1%; non-hygroscopic and resistant to water
wicking.
3. Melting Temperature: Greater than 2,000 degrees F.
4. Flame spread less than 15, and smoke development of 0, when tested
according to ASTM E 84.
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5.
Noncombustible in accordance with STM E 136.
J. Basis-of-Design Product: George Koch Sons, LLC, Koch Acoustical Panel
System, or equal product of an approved manufacturer.
2.04
STRUCTURAL FRAME
A. Frame: Refer to Section 05210 – STRUCTURAL STEEL, for structural steel
sections including tubular steel posts, base plates, channels and retaining
angles, bolted as required to support loads specified herein.
1. Finish for Frame: Galvanize, shop-prime and shop finish frame and
fasteners in accordance with the requirements for finishes specified in
Section 05500 – Miscellaneous Metal Work.
2.05
FABRICATION
A. Shop and Field Connections:
1. Shop connections shall be welded or riveted, and field connections bolted
unless otherwise indicated.
2. Use flat head countersunk rivets finished flush where riveted connections
are exposed to view in finished work.
3. Bolts shall be turned up tight and threads deformed to prevent loosening.
B. Include supports, anchorages, and accessories required for complete assembly.
C. Joints and connections exposed to weather shall be formed to exclude water.
2.06
FINISHES
A. Comply with NAAMM’s “Metal Finishes Manual for Architectural and Metal
Products” for recommendations for applying and designating finishes.
B. Finish acoustical panels in shop prior to assembly and acoustic insulation fill.
C. Surface Preparation: Clean surfaces of dirt, grease, and other contaminants.
Clean welds, mechanical connections, and abraded areas and repair galvanizing
according to ASTM A 780. Apply a conversion coating suited to the organic
coating to be applied over it.
D. Powder-Coated Finish: Prepare, treat, and coat galvanized metal acoustical
screens to comply with resin manufacturer’s written instructions and as follows:
1. Prepare panels by thoroughly removing grease, dirt, oil, flux, and other
foreign matter.
2. Treat prepared acoustical screens with zinc-phosphate pretreatment, rinse,
and seal surfaces.
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3.
4.
Apply thermosetting polyester or acrylic urethane powder coating with
cured-film thickness not less than 3.0 mils (0.08mm).
Color and Gloss: As selected by Architect from manufacturer’s full range.
E. Surface Protection: Apply temporary 3.0 mil thickness PVC temporary covering
to powder coated surface after cure for shipment and installation protection.
PART 3 - EXECUTION
3.01
EXAMINATION
A. Examine structural frame, with Installer present, for compliance with
requirements for installation tolerances and other conditions affecting
performance.
1. Proceed with installation only after unsatisfactory conditions have been
corrected.
3.02
INSTALLATION
A. Install panels on structural frames as shown on approved shop drawings, so that
top edge of acoustical screen is level, with adjacent panels aligned for smooth,
continuous appearance. Install components in accordance with approved shop
drawings and manufacturer’s recommendations.
B. Form closely fitted joints with exposed connections accurately located and
secured.
C. Repair finishes damaged by cutting, welding, soldering, and grinding. Restore
finishes so no evidence remains of corrective work. Return items that cannot be
refinished in the field to the factory, make required alterations, and refinish entire
unit or provide new units.
D. Protect galvanized and nonferrous-metal surfaces from corrosion or galvanic
action by applying a heavy coating of bituminous paint on surfaces that will be in
contact with concrete, masonry, or dissimilar metals.
3.03
ADJUSTING AND CLEANING
A. Remove temporary PVC covering during installation.
B. Clean exposed surfaces of acoustical screens that are not protected by
temporary covering, to remove fingerprints and soil during construction period.
Do not let soil accumulate until final cleaning.
C. Before final inspection, clean exposed surfaces with water and a mild soap or
detergent not harmful to finishes. Thoroughly rinse surfaces and dry.
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D. Restore acoustical screens damaged during installation and construction so no
evidence remains of corrective work. If results of restoration are unsuccessful,
as determined by Architect, remove damaged units and replace with new units.
1. Touch up minor abrasions in finishes with air-dried coating that matches
color and gloss of, and is compatible with, factory-applied finish coating.
END OF SECTION 13080
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