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SpecificationsSECTION 07 42 13.23
METAL COMPOSITE MATERIAL WALL PANELS

RAINSCREEN ATTACHMENT SYSTEM

PART 1 – GENERAL­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­                        

1.1 – Scope of Work

Section Includes

The extent of the aluminum composite building panels indicated on the project drawings and as specified herein.

Composite building panels are hereby defined as the composite aluminum panels that may include but are not limited to the following:

Exterior Cladding: Wall panels, Coping, Soffit, Cornice, Column Covers, etc.

Interior Cladding: Wall covers, Column Covers, Ceilings/Soffit, etc.

Miscellaneous Architectural Features: Beam wraps, Spandrels, Accent Panels, etc.

Note that the Rainscreen system shall not be used for skyward facing panels exposed to the elements.  If Rainscreen system is desired, the skyward facing components shall be sealed with manufacturer’s recommended sealant.

Sealant (only where necessary) for a complete panel system shall be recommended by panel system fabricator. Panel system installer shall furnish and install all panel sealant per manufacturer’s recommendations.

All framing and support structures shall be furnished and installed under a related section.  All support elements, including cold-formed stud metal framing, shall be a minimum of 18 gauge.

Related Work Specified Elsewhere

  1. Structural Steel
  2. Cold-Formed Metal Stud Framing
  3. Sheathing/Gypsum Wall Coverings
  4. Sheet Metal Flashing and Trim
  5. Glass and Glazing
  6. Thermal Insulation
  7. Caulking and Sealants
  8. Weather Barriers

References

ALUMINUM ASSOCIATION

  1. AA-M12C22A41:   Anodized – Clear Coating
  2. AA-M12C22A44:   Anodized – Color Coating

AMERICAN SOCIETY FOR TESTING AND MATERIALS

  1. E 330 Structural Performance of Exterior Windows, Curtain Walls, and Doors Under the Influence of Wind Loads
  2. E 283 Rate of Leakage through Exterior Windows, Curtain Walls, and Doors
  3. D 1781 Climbing Drum Peel Test for Adhesives
  4. E 84 Surface Burning Characteristics of Building Materials
  5. D 1929 Standard Test for Ignition Properties of Plastics
  6. D 3363 Method for Film Hardness by Pencil Test
  7. D 2794 Resistance of Organic Coatings to the Effects of Rapid Deformation
  8. D 3359 Methods for Measuring Adhesion by Tape Test
  9. D 2247 Practice for Testing Water Resistance of Coatings in 100% Relative Humidity
  10. B 117 Method of Salt Spray (Fog) Testing
  11. D 2244 Calculation of Color Differences from Instrumentally Measured Color Coordinates
  12. D 4214 Evaluating the Degree of Chalking of Exterior Paint Films
  13. D 822 Practice for Operating Light and Water Exposure  Apparatus (Carbon-Arc Type) for Testing Paint, Varnish, Lacquer, and Related Products
  14. D 1308 Effect of Household Chemicals on Clear and Pigmented Organic Finishes

(Delete, if not required for panel and finish specified)

1.2 – Submittals

Submit shop drawings showing project layout and elevations, fastening and termination details, joint/reveal layout, sealants (where applicable), flashings (if applicable), any adjacent material necessary for panel coordination, and panel numbering system if available at time of submittal.

Submit manufacturer’s color charts for initial color selection.  Once a color is selected, physical samples may be requested by the architect.  Samples to be a minimum of 2.5” x 2.5”.

Submit aluminum composite material manufacturer’s product data.

Submit letter of compliance from aluminum composite material manufacturer certifying the bidding entity as a qualified fabricator and installer.

l.3 – Performance

Performance Test Standards

Static Air Infiltration

  1. ASTM E 283-04 – Air infiltration at 1.57 lb/ft2 (75 Pa) must not exceed 0.06 ft3/min. per ft² of wall area (305 cm3/s per m2 of wall area).

Static Water Infiltration

  1. ASTM E 331-00 – Water infiltration is defined as uncontrolled water leakage through the exterior face of the assembly.  No uncontrolled water infiltration shall occur under a differential static pressure of 6.24 lb/ft2 (300 Pa) after 15 minutes of exposure.

Structural Performance

  1. ASTM E330-02 – shall be tested in accordance with a design pressure of 40 psf.  Deflection limitations as listed previously (1.05.B).  After initial test, test at 150% of design pressure.  No permanent deformation exceeding L/100 or failure to structural members allowed.

Fire Performance Characteristics: Panel material shall be compliant with one or more of the following:

  1. ASTM E 84
    1. Max. Flame Spread 25
    2. Max. Smoke Developed 450
  2. NFPA 285
    1. Panels shall meet requirements of the Intermediate Scale Multi Story.

Dynamic Water Penetration:

  1. AAMA 501.1-05 – Water infiltration is defined as uncontrolled water leakage through the exterior face of the assembly.  No uncontrolled water infiltration shall occur under a dynamic pressure of 15.0 lb/ft2 (718 Pa).

1.4 – Delivery, Storage, and Handling

Protect finishes by applying heavy duty removable plastic film during production and erection.

Package for protection against transportation damage.

Provide markings to identify components consistent with drawings.

Exercise care in unloading, storing and installing panels to prevent bending, warping, twisting and surface damage.

1.5 – Warranty

The panel system manufacturer will warrant that the system to be free from defects for a period of 1 year.

The aluminum composite material manufacturer shall warrant for a period of 20 years against Max 5 fade based on ASTM D 2244 and Max 8 chalk based on ASTM D 4212 and delamination of the paint finish.

For non-painted finishes (anodized, mill finish, etc.), panel finish warranty shall not exceed 5 years.

PART 2 – PRODUCTS

2.1 – Composite Material Manufacturers

  1. Alucobond by Alcan Composites, Inc., Benton, KY.
  2. Alpolic by Mitsubishi Chemical America, Inc., Chesapeake, VA.
  3. Reynobond by Alcoa, Inc., Eastman, GA.

2.2 – Fabricators

Basis of Design – “Rainscreen RS-610” Attachment System as supplied by Peachtree Protective Covers, 3255 S Sweetwater Rd, Lithia Springs, GA 30122, phone: (800)-341-3325 or ppc@peachtreecovers.com.

2.3 – Materials

Thickness:

  1. 4mm (0.157″)
  2. 6mm (0.236”); preferred total thickness of panel shall be 4mm.  Unless specifically stated as 6mm, 4mm will be assumed.

Composition:  (architect to specify one of the following)

  1. PE Core Material
    1. Two sheets of .020 aluminum sandwiching a polyethylene core formed in a continuous process with no glues or adhesives between dissimilar materials.  Core material to be polyethylene (PE) unless noted otherwise.

     

  2. FR Core Material
    1. Two sheets of .020 aluminum sandwiching a core of extruded thermoplastic formed in a continuous process with no glues or adhesives between dissimilar materials.

Panel finish/color:   (architect to specify one of the following)

  1. Standard color as selected by the owner / architect / engineer from manufacturer’s standard colors.
  2. Custom color to be matched by the panel supplier.
  3. Clear coat over pretreated natural and brushed aluminum substrates.

Color Standards:  (architect to specify one of the following)

  1. Two-coat Finish – includes one color coating and one clear coating.  Finish includes all “solid” color non-metallic, non-mica finishes.
  2. Three-coat Finish – includes one color coating, one flake or mica coating, and one clear coating.  Finish includes all metallic and mica finishes.

Coating Thickness:

  1. Colors: 1.0 mil (±0.2 mil)
  2. Clear: 0.5 mil (±0.05 mil)
  3. Anodized: 0.7 mil (±0.05 mil)

2.4 – Panel System Characteristics

Panel system shall be a rout and return “rainscreen” system.  All extents of the panel system where adjoining with dissimilar material shall be caulked where necessary to prevent uncontrolled water drainage or infiltration.  All other panel joinery shall be formed using ACM material and be free from caulks or sealants.

Detail and fabricate panels to the sizes, configurations and layouts as shown on the approved shop drawings.  Where possible, field measuring shall be conducted for all panels to verify dimensions.  Field verified dimensions shall take precedence over approved shop drawings.

Grain pattern of anodized and metallic finished aluminum facing sheets to run in same direction on the same elevation, unless otherwise specified.

Provide protective film on exposed panel faces and leave in place during fabrication.  Film should be removed after installation (including sealant installation) is complete.

Caulk joints are typically not to exceed 5/8” in width.

Fasteners shall be stainless steel or fabricator’s recommended fasteners with extended-life coating.  All exposed fasteners shall be painted or powder-coated to match ACM color.

Panel stiffeners shall have the option of being mechanically fastened if required per project loading conditions.

PART 3 – EXECUTION

3.1 – Examination

Examine substrates, areas, and conditions for compliance with requirements for installation tolerances, metal wall panel supports, and other conditions affecting performance of work.

Examine primary and secondary wall framing to verify that girts, angles, channels, studs, and other structural panel support members and anchorage have been installed within alignment tolerances required by metal wall panel manufacturer.

Examine solid wall sheathing to verify that sheathing joints are supported by framing or blocking and that installation is within flatness tolerances required by metal wall panel manufacturer.

Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 – Composite Wall Panel Installation

General: Install metal wall panels in orientation, sizes, and locations indicated on approved shop drawings. Install panels perpendicular to girts and subgirts, unless otherwise indicated. Anchor metal wall panels and other components of the Work securely in place, with provisions for thermal and structural movement. Anchor panels securely per engineering recommendations and in accordance with approved shop drawings to allow for necessary thermal movement and structural support.

Install attachment system required to support wall panels and to provide a complete wall system, including subgirts, perimeter extrusions, tracks, panel clips, and anchor channels as may be required.

Include attachment to supports, panel-to-panel joinery, panel-to dissimilar- material joinery, and panel-system joint seals.

Do not begin installation until water barrier and flashings that will be concealed by composite panels are installed.

Clip Installation: Attach integral panel clips to supports at locations, spacings, and with fasteners recommended by system fabricator.

3.3 – Erection Tolerances

Installation Tolerances: Shim and align metal wall panel units within installed tolerance of 1/4-inch in 20-feet (6-mm in 6-m), non-accumulative, on level, plumb, and location lines as indicated and within 1/8-inch (3-mm) offset of adjoining faces and of alignment of matching profiles.

3.4 – Cleaning and Protection

Remove temporary protective coverings and strippable films, if any, as metal wall panels are installed, unless otherwise indicated in manufacturer’s written installation instructions. On completion of metal wall panel installation, clean finished surfaces as recommended by metal wall panel manufacturer. Maintain in a clean condition during construction.

END OF SECTION

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