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SECTION 07482
ARCHITECTURAL METAL WALL CLADDING
NOTE ** Metalwerks architectural metal wall cladding
systems.
NOTE **
NOTE ** This section is based on products manufactured by
Metalwerks Division, Metal Sales and Service, Inc.,
which is located at the following address:
NOTE ** P.O. Box 637
NOTE ** Kennett Square, PA 19348
NOTE ** Tel: (800) 321-7816
NOTE **
NOTE ** Metalwerks offers a complete line of ornamental
metal cladding assemblies, including architectural
metal wall cladding, ornamental sheet metal
enclosures, and metal panel ceilings.
NOTE **
NOTE ** SECTION 07482 - ARCHITECTURAL METAL WALL CLADDING,
Copyright 1997, The Architect's Catalog, Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Delete items below not required for project.
A. Architectural Metal Wall Cladding.
B. Structural Framing for Architectural Metal Panel System.
C. Associated matching sheet metal flashing and trim.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this
project; add others as required.
A. Section 05400 - Cold-Formed Metal Framing.
B. Section 05500 - Metal Fabrications.
C. Section 05735 - Ornamental Sheet Metal Enclosures.
D. Section 07620 - Sheet Metal Flashing and Trim.
E. Section 07900 - Joint Sealants.
1.3 REFERENCES
NOTE ** Delete references from the list below that are not
actually required by the text of the edited
section.
A. AAMA 605.2 - Specification for High Performance Organic
Coatings on Architectural Extrusions and Panels.
B. AISC M016 - Manual of Steel Construction - Allowable
Stress Design.
C. AISC S303 - Code of Standard Practice for Steel Buildings
and Bridges.
D. AISI SG-673 - Cold-Formed Steel Design Manual.
E. ASTM A 36/A 36M - Standard Specification for Carbon
Structural Steel.
F. ASTM A 123 - Standard Specification for Zinc (Hot-Dip
Galvanized) Coatings on Iron and Steel Products.
G. ASTM A 366/A 366M - Standard Specification for Steel
Sheet, Carbon, Cold-Rolled, Commercial Quality.
H. ASTM A 653/A 653M - Standard Specification for Steel
Sheets, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-
Coated (Galvannealed) by the Hot-Dip Process.
I. ASTM B 209 - Standard Specification for Aluminum and
Aluminum-Alloy Sheet and Plate.
J. ASTM B 209M - Standard Specification for Aluminum and
Aluminum-Alloy Sheet and Plate (Metric).
K. ASTM D 1730 - Standard Practices for Preparation of
Aluminum and Aluminum-Alloy Surfaces for Painting.
L. ASTM E 283 - Standard Test Method for Determining the
Rate of Air Leakage Through Exterior Windows, Cirtain
Walls, and Doors Under Specified Pressure Differences
Across the Specimen.
M. ASTM E 330 - Standard Test Method for Structural
Performance of Exterior Windows, Curtain Walls, and Doors
by Uniform Static Air Pressure Difference.
N. ASTM E 331 - Standard Test Method for Water Penetration
of Exterior Windows, Curtain Walls, and Doors by Uniform
Static Air Pressure Difference.
O. AWS D1.1 - Structural Welding Code - Steel.
P. AWS D1.2 - Structural Welding Code - Aluminum.
Q. DIN 50939 - Protection Against Corrosion; Chromating of
Aluminum, Directives, Symbols, and Methods of Test;
Deutsches Institut fur Normung.
R. SSPC Paint 12 - Part of Steel Structures Painting Manual,
Volume 2, Systems and Specifications.
1.4 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Design Data: Design calculations for architectural metal
wall cladding and its connections to structure, bearing
seal and signature of structural engineer.
NOTE ** Delete the following paragraph if not required for
project.
C. Test Data: Certified reports from independent testing
agency showing compliance of a full-scale laboratory mock-
up to performance requirements specified, including:
1. Air infiltration, tested in accordance with ASTM E
283.
2. Water penetration, tested in accordance with ASTM E
331.
3. Structural performance, tested in accordance with
ASTM E 330, at 150 percent of design wind load.
D. Product Data: Manufacturer's descriptive literature,
specifications, installation instructions, and
recommendations, for each component and finish.
E. Shop Drawings: Indicate the following:
1. Layouts of cladding system, including project-
specific details.
2. Field measurements of construction over which
cladding will be installed, with notation of
dimensions which vary significantly from the Contract
Documents.
3. Details of edge conditions, joints, joint widths,
corners, supports, anchorages, trim, flashings,
closures, and perimeter conditions.
4. Scale: 1/2 inch to 1 foot (1:20).
5. Materials list; include component model numbers.
NOTE ** Delete the following paragraph if specifying custom
colors or finishes, or if they are specified in
this section.
F. Selection Samples: Two sets, representing manufacturer's
full range of available materials, finishes, and colors.
G. Verification Samples:
1. For each selected material, color, and finish, submit
two samples, minimum size 24 inches (609 mm) square,
representing actual material and finish.
2. Two samples of each type of accessory specified.
NOTE ** Delete the following paragraph if not required;
these samples would increase project cost.
H. Samples of Fabricated Materials: Submit full-scale
sample of panel joint showing panel edge fabrication,
primary members, anchors, expansion provisions, and
sealers.
I. Test Report for Finish: Certified test reports from
independent testing agency documenting conformance of
coating to specified requirements.
J. Installer's qualifications.
K. Manufacturer's printed installation instructions for
architectural metal wall cladding components; include
component storage requirements.
L. Manufacturer's written instructions for maintenance of
materials and finishes.
1.5 QUALITY ASSURANCE
NOTE ** Delete the following paragraph if not required.
A. Designer's Qualifications: Structural engineer licensed
to practice in the State in which the project is located.
B. Manufacturer Qualifications: Minimum ten years
documented experience producing architectural metal wall
cladding similar to those specified in this section.
1. Maintaining an in-house quality assurance program.
2. Having sufficient capacity to produce the required
systems within project time requirements.
C. Installer Qualifications: Minimum five years documented
experience installing architectural metal wall cladding
similar to those specified in this section, and approved
by manufacturer.
NOTE ** Delete the following paragraph if not required.
D. Mock-Up: Construct mock-up using materials specified in
this section.
1. Construct mock-up at locations indicated or directed,
and as follows:
a. Size: __ feet by __ feet (__ mm by __ mm).
b. Include panels, reveals if any, indicated
accessories, fasteners, and anchors.
2. Obtain Architect's acceptance of mock-up before
beginning construction activities of this section;
accepted mock-up will be standard by which completed
construction activities of this section is judged.
NOTE ** Retain one of the following two sub-paragraphs.
3. Mock-up may not remain as part of work.
4. Accepted mock-up may remain as part of work.
NOTE ** Delete the following paragraph if not required.
E. Pre-Installation Meeting: Convene at job site seven
calendar days prior to scheduled beginning of
construction activities of this section to review
requirements of this section.
1. Require attendance by representatives of the
following:
a. Installer of this section.
b. Other entities directly affecting, or affected
by, construction activities of this section.
2. Notify Architect four calendar days in advance of
scheduled meeting date.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Deliver, handle, and store components in manner to
prevent bending, warping, twisting, and surface damage.
B. Deliver and store components of this section in
manufacturer's unopened packaging until installation.
C. Store components off ground/floor on skids; protect
against warpage, scratches, damage from moisture,
exposure to direct sunlight, and other surface
contamination until installation.
1.7 WARRANTY
A. Written warranty signed by manufacturer and installer
warranting that architectural metal wall cladding is free
from defective materials and installation, and is in
conformance with Contract Documents, and further
warranting repair or replacement of defective materials
or installation at no additional cost, and at the
convenience of the Owner, for five year period following
Substantial Completion. Defective is defined to include,
but not be limited to, the following:
1. Early deterioration, aging, or discoloration of
finish, gaskets, or other components.
2. Uncontrolled penetration of air or water.
3. Failure of the system to meet performance
requirements.
B. Written warranty signed by manufacturer and installer
warranting that finish will not develop excessive fading
or excessive non-uniformity of color or shade, and will
not crack, pit, peel, corrode, or otherwise fail as a
result of defects in materials or installation, and
further warranting repair or replacement of defective
materials and installation at no additional cost, and at
the convenience of the Owner, for a ten year period
following Substantial Completion.
1. Excessive fading is defined to mean a change of
appearance which is perceptible and objectionable, as
determined by the Owner's representative when
visually compared with the original color range
standard.
2. Pit or corroding is defined as being discernible from
a distance of 10 feet (3 m), resulting from the
natural elements in the atmosphere at the project
site.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Acceptable Manufacturer: Metalwerks Division, Metal
Sales and Service, Inc., P.O. Box 637, Kennett Square, PA
19348. ASD. Tel: (800) 321-7816.
NOTE ** Delete one of the two following paragraphs;
coordinate with Division 1 requirements.
B. Requests for substitution will be considered in
accordance with provisions of Section 01600.
C. Substitutions: Not permitted.
D. Provide all components specified in this section from the
same manufacturer.
2.2 ARCHITECTURAL METAL WALL CLADDING SYSTEM
A. Wall Cladding System - Performance:
NOTE ** Insert required performance values in the blanks in
the following paragraphs.
1. Air infiltration: ____ cubic feet per minute per
square foot (___ cu m/h per sq m) at ___ pounds per
square foot (___ kPa) pressure.
2. Water infiltration: ____ cubic feet per minute per
square foot (___ cu m/h per sq m) at ___ pounds per
square foot (___ kPa) pressure, maximum.
NOTE ** Edit the following paragraph to suit project. 30
psf is a relatively high design wind load.
3. Wind load resistance: Withstand 30 pounds per square
foot (14 kPa), positive and negative pressure,
overall, and 60 pounds per square foot (29 kPa),
positive and negative pressure, at corners; without
breakage, component disengagement, or permanent
distortion.
4. Normal-to-wall deflection: Maximum 1/240 of clear
span, or 1/4 inch (6 mm), whichever is less, at full
design load for each panel.
5. Permanent deflection of members: Maximum 0.1 percent
of clear span under 150 percent of anticipated loads,
including windloads, direct loading, structural
movement, structural deflection, and erection
tolerances.
6. Structural movement: Accommodate anticipated
structural movement without loss of water
infiltration integrity, air infiltration integrity,
oil-canning of components, or other result which
would impair appearance or performance of metal
cladding system.
7. Joints: Design for minimum shear forces on sealant
bead and for joint sealer beads uninterrupted by
anchors, shims, or other components.
NOTE ** This section is based on Metalwerks Arc Wall System
1500, 2000, and 2500. If desired, enter the system
number in the blank below. Otherwise, delete the
blank. In paragraphs that follow there are choices
that must be made between 1500, 2000, and 2500
panel system details.
B. Wall Cladding System: Metalwerks Arc Wall System _____;
factory-fabricated aluminum panel system, complete with
all connections, supports, and anchors, with dimensions
based on actual field measurements and coordinated with
adjacent work.
NOTE ** The following drainage system applies only to
System 2500.
1. Drainage: 1/2 inch (13 mm) deep internal
drainage/furring system behind vertical and
horizontal joints, with vertical gutters draining
into horizontal gutters, and horizontal gutters
draining to exterior of panel system at indicated
locations; gutters sealed to back flange of panels
with gaskets.
2. Exposed components: Fabricated from materials
selected for surface flatness, smoothness, and
freedom from surface blemishes.
3. Edges: Straight, with bending radii not less than
minimum recommended by material supplier.
4. Fasteners and anchors: Concealed; exposed fasteners
not permitted except as indicated on approved shop
drawings.
5. Fabricate components as indicated on approved shop
drawings.
C. Panels: Pan-type, with formed right-angle returns and
welded corners.
NOTE ** Delete one of the following two paragraphs. System
1500 uses 1-1/2 inch deep panels, while Systems
2000 and 2500 use 2 inch deep panels.
1. Panel depth: 1-1/2 inch (38 mm).
2. Panel depth: 2 inches (50 mm).
3. Welds: Fully welded, then ground to finish matching
adjacent non-welded surfaces.
NOTE ** Delete one of the following two paragraphs. System
1500 uses 4-sided attachment; systems 2000 and 2500
use one-sided attachment, which permits expansion
and contraction in two directions.
4. Attachment flanges: For four-sided attachment, with
opposing flanges offset for flush appearance.
5. Attachment flanges: Shiplap-type, for overlapping,
weather-shedding, horizontal joint; for panel
anchorage on one flange only.
NOTE ** The following paragraph is for System 1500 only.
6. Vertical and horizontal panel joints: For exposed,
field-applied sealant with backer rod.
NOTE ** The following two paragraphs are for System 2000
only.
7. Vertical panel joints: For dry gasket seals or
exposed, field-applied sealant with backer rod, at
manufacturer's option.
8. Horizontal panel joints: Internally sealed with
factory-applied butyl sealant or for exposed, field-
applied sealant with backer rod, at manufacturer's
option.
NOTE ** The following two paragraphs apply to System 2500
only.
9. Vertical panel joints: For dry gasket seals or
exposed, field-applied sealant with backer rod, at
manufacturer's option.
10. Horizontal panel joints: Internally sealed with
factory-applied butyl sealant.
NOTE ** The following two paragraphs apply to Systems 2000
and 2500, NOT to System 1500. If System 1500 is
used, delete the following two paragraphs.
11. Integral flanges opposing attachment flanges: 2 inch
by 1/2 inch (50 mm by 13 mm) channel for structural
spanning capability and maximum panel rigidity.
12. Concealed hook-on cleat fastener engagement.
13. Curved panels: Accurately factory-formed to radii
with no apparent seams between panel face and legs of
panels or trim.
14. Fascia panels: Also provide 1/4 inch (6 mm) splice
in vertical joints with backup plate.
15. Profiled panels: Where formed returns are not
possible, use welded end caps, miters, and returns
ground smooth prior to finishing.
16. Dimensions: As indicated, for joint width indicated,
on approved shop drawings.
17. Panel dimensional tolerances:
a. Panel Bow: 0.2 percent of panel dimension in
width and length, or 0.1875 inch (4.7 mm),
whichever is greater, maximum.
b. Width or Length: Plus or minus 0.032 inch (0.8
mm) for width or length dimension up to 48 inches
(1220 mm), plus or minus 0.064 inch (1.6 mm) for
width or length dimension 48 inches (1220 mm) to
144 inches (3660 mm).
c. Thickness: Plus or minus 0.008 inch (0.19 mm).
d. Squareness: 0.1875 inch (4.7 mm) difference
between diagonal measurements.
e. Camber: 0.032 inch (0.8 mm).
NOTE ** Delete one of the following two paragraphs.
18. Finish: Fluoropolymer coating.
19. Finish: Polyester powder coating.
2.3 MATERIALS
A. Panels: Aluminum sheet with strength and durability not
less than that required for ASTM B 209/ASTM B 209M, alloy
and temper 3003 H-14 or 5005 H-32AQ.
1. Sheet thickness: Minimum 0.125 inch (3.2 mm).
B. Fluoropolymer Coating Finish: Polyvinylidene fluoride
three-coat coating system, applied by coater certified by
coating manufacturer, conforming to AAMA 605.2, and as
follows:
1. Pretreatment: Chemical etch with cleaner specified
by coating manufacturer.
2. Primer: Acid-resistant primer coating specified by
coating manufacturer; dry film thickness range 0.2 to
0.3 mils (0.005 to 0.007 mm).
3. Color Coat: Containing minimum 70 percent
polyvinylidene resin by weight; Kynar 500(R) or Hylar
5000(R); dry film thickness of 0.8 to 1.2 mils (0.02
to 0.03 mm).
4. Top Coat: Clear top coating containing minimum 70
percent polyvinylidene resin by weight; minimum dry
film thickness of 0.8 mils (0.02 mm).
NOTE ** Delete all but one of the following three
paragraphs to specify color; coordinate selection
method with requirements for Samples in SUBMITTALS
Article of Part 1.
5. Color: _________________.
6. Color: Selected from full range of coating
manufacturer's standard colors.
7. Color: Match Architect's sample.
C. Polyester Powder Coating Finish: Manufacturer's standard
electrostatically-applied or spray-applied polyester
powder coating system as follows:
1. Multi-stage pretreatment process in accordance with
ASTM D 1730, Type B, method 5 or 7, and DIN 50939.
2. Finish coat: One coat commercial-grade polyester
powder coating.
NOTE ** Delete the following paragraph if specifying single
coat only.
3. Second finish coat: Additional coat commercial-grade
polyester powder coating.
4. Total coating thickness: 2.5 to 3.5 mils (0.06 to
0.08 mm) dry film thickness on panel face; 3.5 to 5
mils (0.08 to 0.12 mm) dry film thickness on panel
edges and corners.
NOTE ** Delete all but one of the following three
paragraphs to specify color; coordinate selection
method with requirements for Samples in SUBMITTALS
Article of Part 1.
5. Color: _________________.
6. Color: Selected from full range of manufacturer's
standard colors.
7. Color: Match Architect's sample.
D. Panel Accessories: Same material, sheet thickness, and
finish as adjacent panels, unless otherwise indicated;
including ceiling/soffit panels, fascia panels, reveals,
ceiling closures, and joint sealer recesses.
E. Clips, Stiffeners, and Retainers: Formed or extruded
stainless steel or aluminum, designed for concealed
installation and specified performance criteria.
1. Screws: AISI type 305 stainless steel, self-
tapping, with aluminum washers and rubber grommets;
self-drilling fasteners not permitted.
2. Bolts, nuts, and washers: AISI type 305 stainless
steel.
F. Studs, Purlins, and Sub-Girts: Channel sections roll-
formed of galvanized steel sheet conforming to ASTM A
653/A 653M SQ, with hot-dip G90/Z275 zinc coating,
minimum 16 gage (1.6 mm); minimum 3/4 inch (19 mm) depth;
sizes as indicated and as required to allow for
adjustment.
G. Steel Angles, Plates, Bars, Rods, and Accessories:
Structural steel shapes conforming to ASTM A 36/A 36M, or
formed steel sheet conforming to ASTM A 366/A 366M; hot-
dip galvanized after fabrication in accordance with ASTM
A 123, G90 coating, or coated after fabrication with
epoxy paint, minimum of 0.0785 inch (2 mm) thick.
H. Accessory Materials: Provide concealed gaskets, fillers,
insulation, and other materials as required to complete
the installation.
I. Concealed Gaskets: Vinyl or rubber.
J. Sheet Metal Flashing and Trim Associated with Cladding
System: Same material and finish as panels, and as
specified in Section 07620.
K. Joint Sealants: As specified in Section 07900, and as
recommended by panel manufacturer.
L. Thermal Insulation: As specified in Section 07210.
M. Bituminous Paint: Cold-applied asphalt mastic, SSPC
Paint 12, formulated for 15 mil (0.3 mm) dry film
thickness per coat.
2.4 FABRICATION
A. Welding:
1. Use electrodes and methods recommended by
manufacturer of material being welded, and in
accordance with applicable AWS standards.
2. Use only methods which prevent distortion and
discoloration of exposed faces.
3. Grind weld areas smooth, using only clean equipment
and materials free of iron or iron compounds.
4. Restore finish of welded areas component parts to
finish matching adjacent non-welded surfaces after
welding and grinding.
B. Complete forming and welding of panels before applying
specified finish.
C. Shop Coating: If galvanizing on framing members is not
compatible with alloy of component parts, apply shop coat
of epoxy paint, minimum coating thickness 0.0785 inches
(1.99 mm), after cutting members to size.
D. Apply protective masking to surfaces which will be
exposed in finished work; ensure that masking materials,
including adhesive, will not adversely affect appearance
of components.
PART 3 EXECUTION
3.1 EXAMINATION
A. Verify the following:
1. Dimensions of locations to receive architectural
metal wall cladding are in accordance with approved
shop drawings.
2. Substrates to receive architectural metal wall
cladding are prepared for installation of metal wall
cladding.
3. Substrates are within tolerances to allow plane
tolerances specified in this section.
B. Examine areas and conditions under which work is to be
performed. Do not start work until unsatisfactory
conditions have been corrected.
3.2 INSTALLATION
A. Install components in accordance with approved shop
drawings.
B. Concealed Supports and Fastening Systems: Install in
accordance with referenced AISC publications. Perform
welding as specified for fabrication.
C. Panels: Install to specified tolerances, with hairline
joints between adjacent components.
1. Field cutting of panels not permitted.
2. Do not install panels that are bowed, warped, or
otherwise damaged or impaired in appearance.
D. Anchor with concealed fasteners; provide separators to
prevent freeze-up of moving joints, corrosion, and
electrolytic action.
E. Protect metal surfaces from corrosion and electrolytic
action by applying two coats bituminous paint on surfaces
which will be in contact with concrete, masonry, or
dissimilar metals; secure fastening systems to substrates
using anchors specified in approved shop drawings.
F. Accessories:
1. Install to achieve weathertight assembly as
construction activities progress.
2. Tool sealants to concave profile, cleaning excess
sealant materials from panel surfaces in the process.
G. Installation Tolerances:
1. Maximum variation from plumb, plane, level, slope, or
location in plan: 1/4 inch in 20 feet (5 mm in 5 m),
non-cumulative.
2. Maximum variation in horizontal and vertical joint
alignment: Plus or minus 1/16 inch (1.5 mm).
3.3 CLEANING
A. After removing factory-applied masking, clean surfaces
using materials and methods specified in manufacturer's
instructions.
3.4 PROTECTION
A. Protect installed components from damage to finish or
function by subsequent construction activities; do not
remove factory-applied masking from components until time
of Substantial Completion.
B. Repair damaged components and finishes, if any, in
accordance with manufacturer's recommendations; replace
components which cannot be repaired to Architect's
acceptance.
END OF SECTION