Metl-Span® CF Fluted Insulated Metal Wall Panel For Commercial & Industrial Buildings
PART 1 – GENERAL
- Pre-insulated metal panel cladding where indicated on the drawings. Also included are all necessary trims, fasteners and sealants as required for a weathertight installation. Panels shall be secured to the structure with concealed clips and fasteners in the side joints.
- Steel faced factory foamed-in-place profiled panels with compatible joinery. Panels shall be designed for installation in a vertical orientation.
- Sealants between panels and their intersection.
1.2 RELATED SECTIONS
- Section 07 62 00 (previously 07620) – Sheet Metal Flashing and Trim
- Section 07 92 00 (previously 07900) – Joint Sealants
- AAMA 501.1 – Standard Test Method for Exterior Windows, Curtain Walls and Doors for Water Penetration Using Dynamic Pressure.
- ASTM A 653 – Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process.
- ASTM A 792 – Standard Specification for Steel Sheet, Aluminum-Zinc Alloy Coated Steel by the Hot-Dip Process
- ASTM C 518 – Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.
- ASTM E 72 – Standard Test Methods of Conducting Strength Tests of Panels for Building Construction
- ASTM E 84 – Standard Test Method for Surface Burning Characteristics of Building Materials
- ASTM E 283 – Standard Method for Determining the Rate of Air Leakage Through Exterior Window, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen
- ASTM E 331 – Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Wall by Uniform Static Air Pressure Difference
- CAN/ULC S102 – Standard Method of Test for Surface Burning Characteristics of Building Materials and Assemblies.
1.4 PERFORMANCE REQUIREMENTS
- Structural Tests: The design load/deflection criteria shall be verified from tests per ASTM E 72 “Air Bag Method” using 20 psf (.96 kPa) simulated wind loads. A deflection limit of L/180 shall apply to wall panels.
- Thermal Transmission: Testing in accordance with ASTM C 518, “measurement of steady state thermal transmission”, the panels shall provide a K-factor of .140 btu/sf/hr/deg. F at 75º F. (24º C) mean temperature (air films are not included).
- Vapor Barrier
- Air Infiltration: Air infiltration shall not exceed .06 cfm per square foot of wall area when tested per ASTM E 283 as a static pressure of 6.24 psf (.30 kPa).
- Static Water Penetration: There shall be no uncontrolled water penetration through the panel joints at a static pressure of 12.0 psf (.58 kPa) when tested per ASTM E 331.
- Dynamic Water Penetration: There shall be no uncontrolled water penetration through the panel joints when subjected to a 95 mph (153 kph) slipstream airflow and application of water for a 15 minute period in accordance with AAMA 501.1.
- Surface Burning Characteristics: The insulated core shall be tested in accordance with ASTM E 84 and CAN/ULC S102 for surface burning characteristics. The core shall have a maximum flame spread of 25 and a maximum smoke developed rating of 450.
- FM Approval Standard 4880, 50’ (15.24 m) High Corner Test for Unlimited Height Structures: The panel assembly shall not support a self-propagating fire which reaches any of the limits of the 50’(15.24 m) high corner test structure as evidenced by flaming or material damage of the ceiling of the assembly. Note: Approval is applicable to structures of unlimited height.
- FM Approval Standard 4881, Standard for Class 1 Exterior Wall Systems.
Note: Panels to be installed per Factory Mutual guidelines for required listings.
- Bond Strength
- Fatigue Test: The panel shall withstand deflection cycling at L/180 to two (2) million alternate cycles with no evidence of delamination, core cracking or permanent bowing.
- Freeze/Heat Cycling: The panel shall exhibit no delamination, surface blistering or permanent bowing when subjected to cyclic temperature extremes of –20º F (-28º C) to +180º F (+82º C) for twenty-one (21) eight hour cycles.
- Humidity Test: The panel shall exhibit no delamination or metal corrosion at interface when subjected to a +140º F (+60º C) temperature and 100% relative humidity for a total of 1200 hours.
- Autoclave Test: The panel shall exhibit no delamination of the foam core from metal skins when exposed to 2 psi (.122 kg/sq. cm) pressure at a temperature of +212º F (+100º C) for a total of 2½ hours.
- Submit under provisions of Section 01 33 00 (previously 01300).
- Manufacturer’s data sheets on each product to be used, including:
- Preparation instructions and recommendations.
- Storage and handling requirements and recommendations.
- Material type, metal thickness and finish.
- Installation methods.
- Shop Drawings: Including elevations, fastening patterns, sections of each condition and details as required.
- Selection Samples: For each finish product specified, two complete sets of color chips representing manufacturer’s full range of available colors and patterns.
- Panel Sample: Submit 1’ (305 mm) high by full width sample panel for each profile specified indicating the metal, texture and finish.
- Manufacturer’s Certificates: Certify products meet or exceed specified requirements.
1.6 QUALITY ASSURANCE
- Manufacturer Qualifications: Company specializing in manufacturing factory foamed-in-place insulated metal panels with a minimum documented experience of ten (10) years.
- Installer Qualifications: Company specializing in installation of the products specified for projects of similar size and scope with minimum five (5) years documented experience.
- Materials, accessories and testing specified shall establish the minimum level of quality, performance, dimension and appearance required of any substitution.
- No substitution will be considered unless a written request to the specifying architect is received for approval at least ten (10) days prior to the established bid date. Evidence shall be submitted to demonstrate equivalency to the products and performance levels specified. Laminated panels shall not be considered acceptable substitutes for the specified foamed-in-place panels.
- A complete description of the substitution including details referenced to the wall panels shown on the contract drawings.
- Independent test reports verifying compliance with specified performance requirements.
- A detailed listing of each specification item with which the substitution does not fully comply.
- The manufacturer or wall panel contractor proposing the substitution shall pay the costs of any other subcontractor affected by the proposed substitution.
1.8 DELIVERY, STORAGE AND HANDLING
- Store products in manufacturer’s unopened packaging until ready for installation.
- Store products off the ground, with panels sloped for drainage and covered to protect factory finishes from damage.
- Manufacturer’s Warranty: Manufacturer’s two (2) year limited warranty that panels are free from defects in materials and workmanship, beginning from the date of shipment of panels, but excluding coil coatings (paint finishes) covered under a separate warranty.
- The installation contractor shall issue a separate one (1) year warranty against defects in installed materials and workmanship, beginning from the date of substantial completion of the installation.
- Submit exterior paint manufacturer’s twenty (20) year limited warranty on paint finish against cracking, peeling, blistering, chalk and color change.
Note: No warranty is offered for the interior painted surface of the panel.
PART 2 – PRODUCTS
- Acceptable Manufacturer: Metl-Span, LLC; 1720 Lakepointe Drive, Suite #101, Lewisville, TX 75057; Toll-Free (877) 585-9969; Fax: (972) 420-9382; E-mail: email@example.com; Web site: http://www.metlspan.com
- Requests for substitutions will be considered in accordance with provisions of Section 01 23 00 (previously 01230).
2.2 PANEL DESIGN
- A. Panel – General Requirements: Metl-Span CF Flute Wall Panel – Roll-formed exterior and interior steel sheet faces chemically bonded to continuously foamed-in-place polyurethane core; laminated panels are not acceptable.
- Exterior Face: G-90 galvanized stucco embossed painted steel, minimum Grade 33 and/or AZ-50 Aluminum-Zinc stucco embossed painted steel, minimum Grade 33 in 26ga (0.0187″), 24ga (0.0250″), 22ga (0.0312″).
- Interior Face: G-90 galvanized stucco embossed painted steel, minimum Grade 33 and/or AZ-50 Aluminum-Zinc stucco embossed painted steel, minimum Grade 33 in 26ga (0.0187″), 24ga (0.0250″), 22ga (0.0312″), unless otherwise indicated.
- Longitudinal Joint Sealants: Field applied.
- Foam Core: Non-CFC, Class I, polyurethane.
- Exterior Finish: Exterior face sheet shall be treated with a nominal 0.2 mil (5 microns) base primer, followed by a nominal 0.7 mil (17.5 microns) finish coat of full strength PVF2 fluoropolymer in manufacturer’s standard colors.
Note: Thick mil coatings for aggressive environments are available at extra cost. Siliconized Polyester is also available. Consult the factory for complete information.
- Interior Finish: The interior face sheet shall be a nominal 0.2 mil (5 microns) primer followed by a nominal 0.7 (17.5 microns) polyester coating in USDA compliant Igloo White.
- Metl-Span CF Flute Wall Panel: Concealed fastener wall panels with offset double tongue and groove joinery and an extended metal shelf allowing fasteners to penetrate both metal faces with clips concealed in the side joint.
- Exterior Face Profile: Flute 1” wide, 3/8” deep
- Interior Face Profile: Mesa Wave Pattern, 1/8” deep
- Module Width: 42”
- Thickness: 2”, 2.5”, 3”, 4”, 5” and 6”
- Foam core shall be continuously foamed-in-place, Non-CFC polyurethane.
- Flashing and trim shall be brake-formed sheet metal in the same thickness and finish to match the panels.
PART 3 – EXECUTION
- Panel installer shall examine all structural steel before beginning installation to ensure that all supporting members are straight, level, plumb, properly braced and satisfactory for panel installation.
- Do not begin installation until unsatisfactory conditions are corrected.
- Start of installation shall signify structure and adjacent conditions as being proper and acceptable.
- Install in accordance with manufacturer’s instructions and recommendations including approved shop drawings, installation guidebook and manufacturer’s handbook of construction details.
- Install panel as indicated on drawings, accurate in size, square, and free from distortion or defects.
- Install flashing and trim true and in proper alignment.
- Install sealants where indicated to clean dry surfaces only without skips or voids, to ensure weathertightness and integrity of the vapor barrier.
3.3 DAMAGED MATERIAL
- Damage caused by the manufacturer or wall panel contractor shall be replaced or repaired to as new construction.
- The panel installer shall inspect and approve each completed wall area and shall be responsible for protection of completed work from damage by other trades.
- Replace damaged panels and other components of work, which cannot be repaired by finish touch-up or similar minor repair.
- Wipe finished surfaces clean of any filings caused by drilling or cutting to prevent rust staining.