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SECTION 08920
GLAZED ALUMINUM CURTAIN WALL SYSTEM
NOTE ** This section is based on aluminum curtain wall
systems manufactured by Vistawall Architectural
Products, a division of Butler Manufacturing
Company. For technical information and support,
contact Vistawall at P.O. Box 629; 803 Airport
Road; Terrell, TX 75160. Telephone: 214-551-
6100; 800-869-4567. FAX: 214-551-6264.
NOTE **
NOTE ** Since 1962, Vistawall has serviced the commercial
glazing industry, and since 1945 has serviced the
skylight industry with Naturalite/EPI Skylight
systems. The company is a single source designer
and manufacturer of glazing systems for entrances,
storefronts, window walls, curtain walls, ribbon
windows, operable windows, sloped walls, sliding
mall fronts, skylights, and smoke and heat vents.
Capabilities include engineering, extruding,
anodizing, application of high performance paints,
fabrication, and customer support services.
Electronic specifications for each Vistawall system
are available from your local Vistawall
representative or the Vistawall marketing
department.
NOTE ** SECTION 08920 - GLAZED ALUMINUM CURTAIN WALL
SYSTEM, Copyright 1996, The Architect's Catalog,
Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Structural design, engineering, fabrication, and
installation of complete curtain wall system:
1. Aluminum framing and integral reinforcing.
2. Closures, trim, and flashings.
3. Fasteners, anchors, and related reinforcement.
B. Installation of glass and glazing.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this
project; add others as required.
A. Section 05120 - Structural Steel.
B. Section 05500 - Metal Fabrications.
C. Section 07620 - Sheet Metal Flashing and Trim.
D. Section 07900 - Joint Sealers.
E. Section 08630 - Metal-Framed Skylights.
F. Section 08800 - Glazing: Products installed as part of
the work of this section.
G. Section 12492 - Horizontal Louver Blinds.
1.3 REFERENCES
NOTE ** Delete references from the list below that are not
actually required by the text of the edited
section.
A. AAMA 3.03 - Guide Specifications for Metal Curtain Wall,
Erection Tolerances; American Architectural Manufacturers
Association.
B. AAMA 501 - Methods of Test for Exterior Curtain Walls;
American Architectural Manufacturers Association.
C. AAMA 603.8 - Voluntary Performance Requirements and Test
Procedures for Pigmented Organic Coatings on Extruded
Aluminum; American Architectural Manufacturers
Association.
D. AAMA 605.2 - Specification for High Performance Organic
Coatings on Architectural Extrusions and Panels; American
Architectural Manufacturers Association.
E. AAMA 607.1 - Voluntary Guide Specification and Inspection
Methods for Clear Anodic Finishes for Architectural
Aluminum; American Architectural Manufacturers
Association.
F. AAMA 608.1 - Voluntary Guide Specification and Inspection
Methods for Electrolytically Deposited Color Anodic
Finishes for Architectural Aluminum; American
Architectural Manufacturers Association.
G. ASTM C 509 - Standard Specification for Elastomeric
Cellular Preformed Gasket and Sealing Material.
H. ASTM C 794 - Standard Test Method for Adhesion-in-Peel of
Elastomeric Joint Sealants.
I. ASTM C 864 - Standard Specification for Dense Elastomeric
Compression Seal Gaskets, Setting Blocks, and Spacers.
J. ASTM C 1036 - Standard Specification for Flat Glass.
K. ASTM C 1048 - Standard Specification for Heat-Treated
Flat Glass -- Kind HS, Kind FT Coated and Uncoated Glass.
L. ASTM D 1149 - Standard Test Method for Rubber
Deterioration -- Surface Ozone Cracking in a Chamber.
M. ASTM E 283 - Standard Test Method for Determining the
Rate of Air Leakage Through Exterior Windows, Curtain
Walls, and Doors Under Specified Pressure Differences
Across the Specimen.
N. ASTM E 331 - Standard Test Method for Water Penetration
of Exterior Windows, Curtain Walls, and Doors by Uniform
Static Air Pressure Difference.
O. ASTM E 773 - Standard Test Methods for Seal Durability of
Sealed Insulating Glass Units.
P. ASTM E 774 - Standard Specification for Sealed Insulating
Glass Units.
Q. GANA (GM) - FGMA Glazing Manual; Glass Association of
North America.
R. IGCC - Classification of Insulating Glass Units;
Insulating Glass Certification Council.
1.4 PERFORMANCE REQUIREMENTS
A. Structural Performance:
1. Design framing system including glazing material to
support the following load requirements with maximum
allowable deflection of any glazing support member
not to exceed 1/175 of the unsupported span as tested
in accordance with ASTM E 330:
a. Positive wind load: __________psf.
b. Negative wind load: __________psf.
2. No glass breakage or permanent damage to panels,
fasteners or anchors is permitted, and permanent
deformation to wall framing members may not exceed
0.2 percent of clear span at a structural test load
equal to 1.5 times the specified positive and
negative design wind pressure.
B. Air and Water Resistance:
1. Air Infiltration: Maximum 0.03 cfm per square foot
through total glazed surface area when system is
tested in accordance with ASTM E 283 at a static
pressure of 6.24 psf.
2. Water Infiltration: No uncontrolled water leakage
when system is tested in accordance with ASTM E 331
at static water pressure of 15 psf.
C. Thermal Performance:
1. CRF: Minimum 55 for 1 inch glazed, thermally
improved system.
2. U-Value: Maximum 0.58 for glazed, thermally improved
system.
1.5 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Product Data: Manufacturer's printed information,
installation instructions, and test reports demonstrating
compliance with specified requirements.
1. Include list of recommended cleaning methods, priming
recommendations, and results of adhesion tests for
sealants proposed for use on project.
C. Shop Drawings: Include detailed plans, elevations, and
details of framing members, glazing materials, sealants,
fasteners, anchors, and thicknesses and types of formed
flashing and closures and relationship with adjacent
materials.
D. Selection Samples:
1. Full range of color samples for selection of aluminum
finish.
2. Full range of color samples for sealant selection.
E. Verification Samples:
1. 2 samples of aluminum framing member, not less than
12 inches long, with specified finish.
2. 2 samples of specified glazing material, not less
than 12 inches square.
NOTE ** Delete paragraph below if structural silicone is
not required for project.
F. Certification for Structural Sealant: Submit written
documentation from sealant manufacturer that selected
sealant has been tested for adhesion and compatibility on
representative samples of metal, glass, and other glazing
components, and that sealant joint design and application
procedures shown on shop drawings are suitable for this
project.
1.6 QUALITY ASSURANCE
A. Manufacturer Qualifications: Firm with a minimum of 5
years of experience in design, extrusion, fabrication,
and finishing of aluminum curtain walls similar in
complexity to those required for this project.
B. Installer Qualifications: Commercial contract glazier
with not less than 5 years of successful experience
installing similar glazing systems and approved by
manufacturer of aluminum curtain wall system.
C. Materials: Provide primary materials of each type by a
single manufacturer and secondary materials acceptable to
that manufacturer.
D. Pre-Installation Conference: Conduct meeting immediately
prior to commencing field operations, to establish
coordination requirements and quality control procedures.
1.7 DELIVERY, STORAGE, AND HANDLING
A. Deliver materials in labeled protective packages. Store
and handle in strict compliance with manufacturers'
instructions and recommendations. Protect from damage
due to weather and construction operations.
B. Sequence deliveries to avoid delays, but minimize storage
on project site.
1.8 PROJECT CONDITIONS
A. Field Measurements: When practical, take accurate field
measurements before preparation of shop drawings and
fabrication. Do not delay progress of the work; allow
for construction tolerances.
1.9 WARRANTY
A. Curtain Wall System Warranty: Provide installer warranty
to repair or replace defective work, including without
limitation, components that exhibit uncontrolled leakage
of water, abnormal aging or deterioration, or other
performance failures.
1. Warranty period: 1 year from completion of work of
this section.
B. Finish Warranty: Provide manufacturer warranty agreeing
to repair or replace work with defective finish.
1. Warranty period for film integrity: One year from
date of application.
NOTE ** Retain subparagraph below only for fluoropolymer
finish.
2. Warranty period for color integrity: One year from
date of application.
1.10 MAINTENANCE MATERIALS
NOTE ** The Owner may want to consider having a small
quantity of extra stock on hand for the most common
sizes and shapes of glass. Lead time for special
tints or coatings may be as much as 14 to 16 weeks.
NOTE **
NOTE ** Note that projects that use federal funds may not
allow purchase of extra materials, since funding
typically excludes maintenance materials.
A. Extra Materials: When 50 or more glazing units of same
type and size are required, provide 1 percent extra
materials for Owner's inventory, boxed separately,
properly labeled, and delivered for storage to area
designated by Owner.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Design is based on curtain wall system by Vistawall
Architectural Products, PO Box 629, 803 Airport Road,
Terrell, Texas; Telephone (214) 551-6100;
FAX (214) 551-6264.
1. Products of other manufacturers may be submitted for
consideration, provided that submittals include
written statement certifying equivalence or list of
exceptions to, or variances from, specified
requirements.
NOTE ** Delete subparagraph above or below.
2. Substitutions will not be acceptable.
2.2 MATERIALS
A. Framing System:
1. Framing members: 6063-T6 extruded aluminum for
structural members; 6063-T5 for non-structural
components; temper and alloy as recommended by
manufacturer.
NOTE ** Select from among the three options below to suit
project requirements.
2. Formed flashing and closures: Minimum 0.040 inch
thick aluminum, anodized finish.
3. Formed flashing and closures: Minimum 0.062 inch
thick aluminum, painted finish.
4. Formed flashing and closures: AISI Type 302/304
stainless steel with satin finish at locations
indicated.
B. Vertical Glazing: As specified in Section 08800.
C. Insulated Panels:
NOTE ** Metal panels integral with the curtainwall system
should be specified in this section. Do not exceed
60 inches in width and 20 feet in length, due to
product availability. Kynar 500/Hylar 5000 type
finishes are most common and the sheets are
normally spray painted (non coil-coated) to match
finish of framework. Some fabricators stock
standard colors, but these rarely match the
standard extrusion colors.
NOTE **
NOTE ** The insulated panels specified below are based on
Vistawall Vistabond aluminum panels.
1. Type: Flat, mill edge aluminum faced panels with
thermoplastic compound core.
2. Face sheets: Prefinished 0.020 inch thick aluminum,
alloy 3105-H25.
NOTE ** Option above is standard; thicker face sheet below
is available with Fire Core Panel.
3. Face sheets: Prefinished 0.028 inch thick aluminum,
alloy 3105-H25.
4. Core: Polyethylene.
5. Core: Fire resistant core.
NOTE ** Select desired core type from options above.
Select panel thickness from options below. Fire
core panel is available in 4 mm and 5 mm thickness.
6. Thickness: 0.157 inch (4 mm).
7. Thickness: 0.197 inch (5 mm).
8. Thickness: 0.236 inch (6 mm).
D. Glazing Gaskets:
1. Exterior: Continuous EPDM gasket at each glass and
spandrel panel.
2. Interior: Continuous, closed-cell PVC foam-sealant
tape, sealed at corners.
E. Anchors and Fasteners:
1. Anchor locations not exposed to weather: Standard
steel, non-plated lag, sleeve and stud bolt anchors.
2. Anchor locations exposed to weather: Zinc chromate
or cadmium plated steel anchors.
3. Connections exposed to weather: 300 series stainless
steel for bolted connections and fasteners.
a. Also use at locations where bolted connections
penetrate secondary gutter of sill member.
4. Reinforce butt, mitered, and expansion joint framing
member splices with internal aluminum splice plates
where possible; mechanically fasten with stainless
steel truss head fasteners or fasten using welds in
accordance with curtain wall manufacturer's standard
connection details.
F. Sealants:
1. Comply with recommendations of sealant manufacturer
for specific sealant selections.
2. Provide only sealants that have been tested per ASTM
C 794 to exhibit adequate adhesion to samples of
glass and metal equivalent to those required for
project.
3. Exposed metal to metal joints: Silicone sealant
selected from manufacturer's standard colors.
2.3 FABRICATION
A. Fabricate framing system to be straight, plumb, level,
and square. Provide components to sizes, shapes, and
profiles indicated on approved shop drawings.
B. Fabricate to accommodate thermal movement in horizontal
members by non-visible means. Assemble components with
uniform, tight joints.
2.4 FINISHES
NOTE ** Fluoropolymer coatings and anodized finishes for
curtain wall applications provide excellent
weathering and chemical resistant characteristics.
Polyester/acrylic finishes are more suitable for
interior surfaces and commercial applications.
Finishes below are listed in order of increasing
cost.
A. Provide finish as follows for exterior exposed aluminum
surfaces:
NOTE ** Select desired finish for exterior from options
below. If interior finish is to be different from
exterior, cut interior finish from options below
and paste under interior finish paragraph following
this one.
1. Clear Anodic Coating, Class II: AAM12C22A31 clear
anodized coating complying with AAMA 607.1, 0.4-0.7
mil thickness minimum.
NOTE ** Coating above is generally for interior, non-
abusive situations. Exterior use is recommended
only if regular maintenance will be performed.
Coating below is suitable for interior or exterior
use.
2. Clear Anodic Coating, Class I: AAM12C22A41 clear
anodized coating complying with AAMA 607.1, 0.7 mil
thickness minimum.
3. Color Anodic Coating, Class II: AAM12C22A34 coating
electrolytically deposited and complying with AAMA
608.1, 0.4 mil thickness minimum.
a. Color: Medium bronze.
b. Color: Dark bronze.
c. Color: Black.
NOTE ** Coating above is generally for interior, non-
abusive situations. Exterior use is recommended
only if regular maintenance will be performed.
Coating below is suitable for interior or exterior
use.
4. Color Anodic Coating, Class I: AAM12C22A44 coating
electrolytically deposited and complying with AAMA
608.1, 0.7 mil thickness minimum.
a. Color: Medium bronze.
b. Color: Dark bronze.
c. Color: Black.
5. Polyester/Acrylic Coating: AAMA 603.8.
a. Color: As selected from manufacturer's standard
colors.
b. Color: Custom color to match Architect's sample.
c. Color: Color No. _______, manufactured by
____________________.
6. Fluoropolymer Coating: 70% Kynar 500/Hylar 5000
resin base fluoropolymer finish complying with AAMA
605.2.
a. Provide 2 coats.
b. Provide 3 coats.
c. Provide 4 coats.
d. Color: As selected from manufacturer's standard
colors.
e. Color: Custom color to match Architect's sample.
f. Color: Color No. _______, manufactured by
____________________.
B. Provide finish as follows for interior exposed aluminum
surfaces:
NOTE ** Select interior finish from options below and
delete others. For third option, cut selection
from above and paste below.
1. Match exterior finish.
2. Match exterior finish, except provide following
color: ________________.
3. [Cut desired selection from above and paste to this
location.]
PART 3 EXECUTION
3.1 PREPARATION
A. Take field dimensions and examine condition of
substrates, supports, and other conditions under which
work of this section is to be performed to verify that
the work may properly commence. Do not proceed with
installation until unsatisfactory conditions have been
corrected.
3.2 INSTALLATION
A. Install glazed curtain wall in strict accordance with
manufacturer's instructions and recommendations. Match
profiles, sizes, and spacings indicated on approved shop
drawings.
B. Ensure that drainage system operates properly in
accordance with AAMA 501 procedures.
C. Do not proceed with structural silicone work when metal
temperature is below 32 degrees F.
D. Coordinate installation with adjacent work to ensure
completion of weatherproof assembly. Anchor work
securely to supporting structure, but allow for
differential and thermal movement in compliance with AAMA
3.03.
E. Isolate between aluminum and dissimilar metals with a
protective coating or plastic strip to prevent
electrolytic corrosion.
F. Install curtain wall system so as to maintain a virtually
flat face cap, with no visible bowing.
G. Install entire system so that fasteners are not visible.
3.3 ADJUSTING AND CLEANING
A. During installation, remove labels, part number markings,
sealant smears, handprints, and construction dirt from
all components.
B. Touch up damaged coatings and finishes and repair minor
damage to eliminate all evidence of repair. Remove and
replace components that cannot be satisfactorily
repaired.
C. Clean all exposed surfaces, including metal and glass,
using non-abrasive materials and methods recommended by
manufacturer of component being cleaned. Remove and
replace components that cannot be cleaned successfully.
3.4 PROTECTION
A. Reclean as necessary to prevent damage. Protect
completed work from damage and deterioration and inspect
immediately before final acceptance of project.
END OF SECTION