2004 Master Format™ Section 07 41 13


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(Previously Section 07411)

Guide Specification: Metl-Span CFR Roof Panels
For Commercial & Industrial Buildings



PART 1 – GENERAL

1.1 SUMMARY

  1. 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 sidejoints.
    1. Steel faced factory foamed-in-place profiled panels with compatible joinery. 
    2. Sealants between panels and their intersection.

1.2 RELATED SECTIONS

  1. Section 07 62 00 (previously 07620) – Sheet Metal Flashing and Trim
  2. Section 07 92 00 (previously 07920) – Joint Sealants

1.3 REFERENCES

  1. ASTM A 653 – Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process.
  2. ASTM A 792 – Standard Specification for Steel Sheet, Aluminum-Zinc Alloy Coated Steel by the Hot-Dip Process.
  3. ASTM C 518 – Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.
  4. ASTM E 72 – Standard Test Methods of Conducting Strength Tests of Panels for Building Construction
  5. ASTM E 84 – Standard Test Method for Surface Burning Characteristics of Building Materials.
  6. ASTM E 1680 – Standard Method for Rate of Air Leakage through Exterior Metal Roof Panel Systems.
  7. ASTM E 1646 – Standard Test Method for Water Penetration of Metal Roof Panel Systems by Uniform Static Air Pressure Difference.
  8. ASTM E 331 – Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Wall by Uniform Static Air Pressure Difference.
  9. CAN/ULC S102 – Standard Method of Test for Surface Burning Characteristics of Building Materials and Assemblies.
  10. CAN/ULC S126 – Standard Method of Test for Fire Spread Under Roof-Deck Assembly.

1.4 PERFORMANCE REQUIREMENTS

  1. Structural Tests:  The design load/deflection criteria shall be verified from tests per ASTM E 72 “Air Bag Method” using a 20 psf (.96 kPa) simulated wind load.  A deflection limit of L/240 shall apply to roof panel.
  2. Thermal Transmission:  Testing in accordance with ASTM C 518, “measurement of thermal performance of building assemblies”, the panels shall provide a K-factor of .140 btu/sf/hr/deg. F at 75° F. (24° C) mean temperature (air films are not included).
  3. Vapor Barrier
    1. Air Infiltration:  Air infiltration shall not exceed .002 cfm per square foot of wall area when tested per ASTM E 1680 at a static pressure of 12.0 psf (.576 kPa).
    2. Static Water Penetration:  There shall be no uncontrolled water penetration through the panel joints at a static pressure of 12.0 psf (.96 kPa) when tested per ASTM E 1646.
  4. Fire
    1. Factory Mutual Research Corporation (FMRC) 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.
    2. Factory Mutual Research Corporation (FMRC) Standard 4471:  The panel shall meet a Class 1A fire classification and a Class SH Hailstorm classification.
    3. Surface Burning Characteristics:  The insulated core shall have been tested in accordance with ASTM E 84 & 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.
    4. Fire Spread under Roof-Deck Assemblies:  The insulated core shall have been tested in accordance with CAN/ULC S126 standard Method of Test for Fire Spread under Roof-Deck Assemblies.
  5. Wind Resistance
    1. The CFR roof panel shall be UL 90 rated in accordance with UL 580 test for wind uplift performance of roof assemblies, and UL 166 rated in accordance with UL 1897 test for wind uplift performance of roof membranes.
    2. The CFR roof panel shall be Factory Mutual 4471 approved and have FM 1-90 windstorm resistance approval.
  6. Bond Strength
    1. 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.
    2. Freeze/Heat Cycling:  The panel shall exhibit no delamination, surface blistering or permanent bowing when subjected to cyclic temperature extremes of –20° F (-28° C) to +180° F (+82° C) for twenty-one (21) eight hour cycles.
    3. Humidity Test:  The panel shall exhibit no delamination or metal corrosion at interface when subjected to a +140° F (+60° C) temperature and 100% relative humidity for a total of 1200 hours.
    4. 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 +212°F (+100° C) for a total of 2½ hours.

1.5 SUBMITTALS

  1. Submit under provisions of Section 01 33 00 (previously 01300).
  2. Manufacturer’s data sheets on each product to be used, including:
    1. Preparation instructions and recommendations.
    2. Storage and handling requirements and recommendations.
    3. Material type, metal thickness and finish.
    4. Installation methods.
  3. Shop Drawings:  Including elevations, fastening patterns, sections of each condition and details as required.
  4. Selection Samples:  For each finish product specified, two complete sets of color chips representing manufacturer’s full range of available colors and patterns.
  5. Panel Sample:  Submit 1’ (305 mm) high by full width sample panel for each profile specified indicating the metal, texture and finish.
  6. Manufacturer’s Certificates: Certify products meet or exceed specified requirements.

1.6 QUALITY ASSURANCE

  1. Manufacturer Qualifications:  Company specializing in manufacturing factory foamed-in-place insulated metal panels with a minimum documented experience of ten (10) years.
  2. Installer Qualifications:  Company specializing in installation of the products specified for projects of similar size and scope with minimum five (5) years documented experience.

1.7 SUBSTITUTIONS

  1. Materials, accessories and testing specified shall establish the minimum level of quality, performance, dimension and appearance required of any substitution.
  2. 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.
    1. A complete description of the substitution including details referenced to the roof panel shown on the contract drawings.
    2. Independent test reports verifying compliance with specified performance requirements.
    3. A detailed listing of each specification item with which the substitution does not fully comply.
  3. The manufacturer or roof panel contractor proposing the substitution shall pay the costs of any other subcontractor affected by the proposed substitution.

1.8 DELIVERY STORAGE AND HANDLING

  1. Store products in manufacturer’s unopened packaging until ready for installation.
  2. Store products off the ground, with panels sloped for drainage and covered to protect factory finishes from damage.

1.9 WARRANTY

  1. 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. 
  2. 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.
  3. 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

2.1 MANUFACTURER

  1. Acceptable Manufacturer:  Metl-Span, LLC; 1720 Lakepointe Drive, Suite #101, Lewisville, TX  75057; Toll-Free (877) 585-9969; Fax: (972) 420-9382; E-mail: panel@metlspan.com; Web site: http://www.metlspan.com
  2. Requests for substitutions will be considered in accordance with provisions of Section 01 23 00 (previously 01230).

2.2 PANEL DESIGN

  1. Panel – General Requirements:  Metl-Span CFR Roof Panel - Roll-formed exterior and interior steel sheet faces chemically bonded to continuously foamed-in-place polyurethane core; laminated panels are not acceptable.
    1. Exterior Face: G-90 galvanized stucco embossed painted steel, minimum Grade 50 and/or AZ-50 Aluminum-Zinc stucco embossed, painted steel in 24ga (0.0250”) & 22 ga (0.0312”); or AZ-55 Aluminum-Zinc stucco embossed, unpainted steel in 24ga (0.0250”) unless otherwise indicated.
    2. 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.
    3. Longitudinal Joint Sealants:  Field applied.
    4. Foam Core:  Non-CFC, Class I, polyurethane.
    5. 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.
    6. 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.
  2. Metl-Span CFR Roof Panel:  The CFR insulated metal roof panel shall have a tongue and groove interlock at the base of the panel and a mechanically closed standing seam at the exterior surface of the panel.  The CFR roof panel shall be attached to the structure with a clip and fasteners concealed within the side joint of the panel and the installation shall be completely from the exterior side of the building envelope.  Exposed through fasteners into the ribs or flat areas of the panel from the exterior side are not acceptable.  The roof panels shall be factory notched and swaged to facilitate endlapping of the panels, and the endlap extensions shall be factory cut and have all foam removed.  Field notching, swaging and cutting of endlap extensions shall not be accepted.  Endlaps shall also have factory installed backer plates to insure proper fit-up of the exterior faces for maximum water tightness.
    1. Exterior Profile:  2” high mechanically closed standing seam; with an 1/8” deep Mesa Wave profile between the seams
    2. Interior Profile:  Mesa Wave Pattern, 1/8” deep
    3. Module Width:  30”, 36”& 42”
    4. Thickness: 2”, 2.5”, 3”, 4”, 5” & 6”
    5. Foam core shall be continuously foamed-in-place, Non-CFC polyurethane.
  3. Flashing and trim shall be brake-formed sheet metal in the same thickness and finish to match the panels.


PART 3 – EXECUTION

3.1 EXAMINATION

  1. 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.
  2. Do not begin installation until unsatisfactory conditions are corrected.
  3. Start of installation shall signify structure and adjacent conditions as being proper and acceptable.

3.2 INSTALLATION

  1. Install in accordance with manufacturer’s instructions and recommendations including approved shop drawings, installation guidebook and manufacturer’s handbook of construction details.
  2. Install panel as indicated on drawings, accurate in size, square, and free from distortion or defects.
  3. Install flashing and trim true and in proper alignment.
  4. 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

  1. Damage caused by the manufacturer or panel contractor shall be replaced or repaired to as new construction.
  2. The panel installer shall inspect and approve each completed area and shall be responsible for protection of completed work from damage by other trades.

3.4 CLEANING

  1. Replace damaged panels and other components of work, which cannot be repaired by finish touch-up or similar minor repair.
  2. Wipe finished surfaces clean of any filings caused by drilling or cutting to prevent rust staining.