RENOVATE BLDG 204 CATH LAB II

Project #621-22-121

INSULATED METAL WALL PANELS

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PART 1 – GENERAL

1.1 SECTION INCLUDES

A. Foamed-insulation-core concealed fastener metal wall panels with related metal trim and accessories.

1.2 RELATED REQUIREMENTS

A. Division 01 Section "Sustainable Design Requirements" for related general requirements.

B. Division 05 Section "Structural Steel Framing" for steel framing supporting metal panels.

C. Division 05 Section "Cold-Formed Metal Framing" for cold-formed metal framing supporting metal panels.

D. Division 07 Section "Sheet Metal Flashing and Trim" for sheet metal flashing items in addition to items specified in this Section.

E. Division 07 Section "Metal Roof Panels" for standing seam insulated metal roof panel system.

1.3 REFERENCES

A. American Architectural Manufacturer's Association (AAMA):

www.aamanet.org:

AAMA 501.2 - Quality Assurance and Diagnostic Water Leakage Field Check of Installed Storefronts, Curtain Walls, and Sloped Glazing Systems.

B. American Society of Civil Engineers (ASCE): www.asce.org/codes-standards:

ASCE 7 - Minimum Design Loads for Buildings and Other Structures.

C. ASTM International (ASTM): www.astm.org:

ASTM A 653 - Specification for Steel Sheet, Zinc-Coated (Galvanized) or

Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process.

ASTM A 755 - Specification for Steel Sheet, Metallic Coated by the Hot-

Dip Process and Prepainted by the Coil-Coating Process for Exterior

Exposed Building Products.

ASTM A 792 - Standard Specification for Steel Sheet, 55% Aluminum-Zinc

Alloy-Coated 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 C 1363 - Standard Test Method for Thermal Performance of Building

Materials and Envelope Assemblies by Means of a Hot Box Apparatus.

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ASTM C 273 – Properties of Sandwich Core Materials.

ASTM D 1621 - Compressive Properties of Rigid Cellular Plastics.

ASTM D 1622 - Apparent Density of Rigid Cellular Plastics.

ASTM D 1623 – Standard Test Method for Tensile and Tensile Adhesion

Properties of Rigid Cellular Plastics.

ASTM D 2244 - Test Method for Calculation of Color Differences from

Instrumentally Measured Color Coordinates.

ASTM D 4214 - Test Methods for Evaluating Degree of Chalking of

Exterior Paint Films.

ASTM D 6226 - Standard Test Method for Open Cell Content of Rigid

Cellular Plastics.

ASTM E 72 - Standard Test Methods of Conducting Strength Tests of

Panels for Building Construction.

ASTM E 84 - Test Methods for Surface Burning Characteristics of

Building Materials.

ASTM E 283 - Standard Test Method for Determining Rate of Air Leakage

Through Exterior Windows, 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 Walls by Uniform Static Air

Pressure Difference.

ASTM E 1592 - Standard Test Method for Structural Performance of Sheet

Metal Roof and Siding Systems by Uniform Static Air Pressure

Difference.

D. National Fire Protection Association (NFPA):

NFPA 259 – Test Method for Potential Heat of Building Materials.

NFPA 285 – Evaluation of Fire Propagation Characteristics of Exterior

Non-Load Bearing Wall Assemblies.

NFPA 286 – Fire Test of Evaluating Conditions of Wall and Ceiling

Finish to Roof Fire Growth.

E. FM Global (FM): www.fmglobal.com:

FM 4880 Examination Standard for Class 1 Fire Rating of Building Panels or Interior Finish Materials.

FM 4881 Approval Standard for Class 1 Exterior Wall Systems.

1.4 QUALITY ASSURANCE

A. Manufacturer/Source: Provide metal panel assemblies and accessories from a single manufacturer approved under an accredited third-party quality control program.

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B. Manufacturer Qualifications: Approved manufacturer listed in this

Section with minimum ten years’ experience in the manufacturing of similar products and successful use in similar applications.

1. Approval of Comparable Products: Submit product data, samples, project references, sample warranty, and quality control certificates in accordance with project substitution requirements.

2. Substitutions following award of contract are not allowed except as stipulated in Division 01 General Requirements. C. Installer

Qualifications: Experienced Installer certified by metal panel manufacturer with minimum of five years’ experience with successfully completed projects of a similar nature and scope.

3. Installer's Field Supervisor: Experienced mechanic certified by metal panel manufacturer supervising work on site whenever work is underway. D. Buy American Compliance: Materials provided under work of this Section shall comply with the following requirements:

4. Buy American Act of 1933 BAA-41 U.S.C §§ 10a – 10d.

5. Buy American provisions of Section 1605 of the American Recovery and Reinvestment Act of 2009 (ARRA).

1.5 ADMINISTRATIVE REQUIREMENTS

A. Preinstallation Meeting: Prior to erection of framing, conduct preinstallation meeting at site attended by Owner, Architect, metal panel installer, metal panel manufacturer's technical representative, and related trade contractors. Coordinate building framing and opening/penetrations in relation to metal wall panel system.

1.6 ACTION SUBMITTALS

A. Product Data: Manufacturer’s data sheets for specified products.

B. Shop Drawings: Show layouts of metal panels. Include details of each condition of installation, panel profiles, edge conditions, joints, fastener and sealant placement, flashings, openings, penetrations, and structural support coordination.

C. Samples for Verification:

1. Provide 12-inch-long section of specified metal panel profile.

2. Provide color chip verifying Dark Gray Metallic finish.

1.7 INFORMATIONAL SUBMITTALS

A. Product Test Results: Indicating compliance of products with requirements.

B. Qualification Information: For Installer and Field Supervisor.

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C. Accreditation Certificate: Indicating manufacturer accreditation under

IAS AC472.

D. Warranty: Unexecuted sample copies of manufacturer and installer warranties.

1.8 CLOSEOUT SUBMITTALS

A. Maintenance data.

B. Executed copy of manufacturer's and installer's warranties.

1.9 DELIVERY, STORAGE, AND HANDLINGA.

A. Protect products of metal panel system during shipping, handling, and storage to prevent staining, denting, or deterioration.

B. Deliver, unload, store, and erect metal panels without deforming panels or exposing them to surface damage. Store per manufacturer's instructions and shield panels from direct sunlight until installed.

1.10 WARRANTY

A. Special Manufacturer’s Warranty: Manufacturer’s two (2) year limited warranty providing panels to be free from defects in materials and workmanship, beginning from date of Substantial Completion.

B. Installer Warranty: Installation contractor's two (2) year written warranty against defects in installed materials and workmanship.

C. Special Panel Finish Warranty: Manufacturer’s limited warranty on the exterior fluoropolymer paint finish against film failure, adhesion loss, cracking, peeling, and excessive chalking/fading per ASTM D 2244 and ASTM

D 4214.

PART 2 – PRODUCTS

2.1 MANUFACTURER

A. Basis of Design Manufacturer: Metl-Span, a Nucor company; Lewisville, Texas. Tel: 844.574.5367; Web: metlspan.com.

B. Provide basis of design product or comparable product (style and performance) approved by Architect/VA COR prior to construction.

2.2 PERFORMANCE REQUIREMENTS

A. General: Provide metal panel system meeting performance requirements as determined by application of specified tests by a qualified testing facility.

B. Structural Performance: Capable of withstanding structural and wind load pressures indicated on structural drawings within limits set by ASTM

E 72. Deflection limits shall not exceed 1/180 of the span under design loads.

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C. FM Approvals Listing: Comply with FM Approval 4881 for exterior wall systems.

D. Fire Performance Characteristics:

Flame Spread Index (ASTM E 84): 25 or less core rating.

Smoke Developed Index (ASTM E 84): 450 or less core rating.

Large Scale Fire Performance: Class 1 per FM 4880.

Wall Assembly Fire Propagation: Complies with NFPA 285.

Room Surface Fire Growth: Complies with NFPA 286.

Potential Heat: Tested per NFPA 259.

E. Air Infiltration (ASTM E 283):

Less than 0.01 cfm/sq. ft. air infiltration rate at static pressure differential of 6.24 psf (300 Pa).

F. Water Penetration (ASTM E 331):

No uncontrolled water penetration at static pressure differential of

20.0 psf (958 Pa).

G. Thermal Movement:

Accommodate thermal movement resulting from ambient and surface temperature variations without buckling, stress on fasteners, or failure of joint sealants.

2.3 INSULATED METAL WALL PANELS

A. Concealed Fastener, Insulated Metal Wall Panels with Foam Core:

Structural insulated wall panels consisting of exterior and interior metal face sheets factory-bonded to a polyurethane core with tongue-and-groove joint profile. Basis of Design: Metl-Span, CF Mesa.

Exterior Face Sheet:

a. Material: 22 Gauge G-90 Galvanized Coated Steel (ASTM A 653) or AZ-

50 Aluminum-Zinc Alloy-Coated Steel (ASTM A 792).

b. Profile: Mesa micro-corrugated profile (4 inches on center by 1/8 inch deep).

c. Surface Texture: Stucco embossed.

d. Finish: Two-Coat Fluoropolymer (PVDF) System (0.2-0.3 mil primer with 0.7-0.8 mil 70% PVDF topcoat).

e. Color: Dark Gray Metallic (to match standing seam roof panel color).

Interior Face Sheet:

a. Material: 26 Gauge G-90 Galvanized or AZ-50 Aluminum-Zinc Alloy-

Coated Steel.

b. Profile: Light Mesa micro-corrugated profile.

c. Surface Texture: Stucco embossed.

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d. Finish: Standard USDA-compliant Polyester finish system.

e. Color: Manufacturer's Standard Igloo White.

Panel Dimensions:

a. Panel Width: 42 inches (1067 mm) standard.

b. Panel Thickness: As indicated on drawings to achieve required continuous insulation value.

Insulating Core: Factory foamed-in-place closed-cell polyurethane with zero ozone depletion potential.

a. Closed-Cell Content: Minimum 90 percent per ASTM D 6226.

b. Minimum Core Density: 2.0 pcf per ASTM D 1622.

c. Minimum Compressive Strength: 20 psi per ASTM D 1621.

2.4 METAL WALL PANEL ACCESSORIES

A. General: Provide complete metal panel assemblies incorporating trim, base channels, copings, flashings, closures, and sealants.

B. Flashing and Trim: Match material, gauge (minimum 22 or 24 ga as required), finish, and Dark Gray Metallic color of exterior wall panels.

C. Panel Clips: Heavy-gauge hot-dip galvanized steel clips designed for fully concealed attachment within panel side joints.

D. Fasteners: Self-drilling or self-tapping screws as recommended by panel manufacturer. Where exposed fasteners cannot be avoided, provide stainless steel or coated heads factory-matched to panel finish.

E. Joint Sealers: Mastic Tape / Non-Skinning Sealant: Factory or field applied in panel side joints per manufacturer installation details.

Gaskets: Manufacturer's standard continuous interior joint gaskets.

2.5 FABRICATION

A. Factory fabricate insulated metal wall panels and trim to accurate profiles, lengths, and specified tolerances.

B. Form panel joints to fit tight with continuous interlock concealing mechanical clips and fasteners.

PART 3 – EXECUTION

3.1 EXAMINATION

A. Examine support framing with Installer present. Confirm framing members are plumb, level, and within manufacturer tolerances (not exceeding 1/4 inch in 20 feet in any plane).

B. Do not proceed with panel installation until structural framing deficiencies are corrected.

3.2 INSTALLATION

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A. Install CF Mesa panels in accordance with manufacturer's written instructions and approved shop drawings.

B. Fasten panels securely to structural supports using concealed clips and specified fasteners.

C. Field Cutting: Cut panels using clean-cutting tools recommended by manufacturer (no abrasive saws or torches).

D. Joint Sealing: Apply continuous beads of non-skinning butyl sealant in panel side joints and base details to ensure continuous air and vapor barrier continuity.

3.3 ACCESSORY INSTALLATION

A. Install metal flashing, base gutters, trim, and roof-to-wall transition accessories in a weather-tight manner, allowing for thermal expansion and contraction.

3.4 FIELD QUALITY CONTROL

A. Water-Spray Test: Perform field hose testing per AAMA 501.2 on selected panel transitions and details if required by Owner or Architect.

3.5 CLEANING AND PROTECTION

A. Strip protective plastic film immediately upon panel installation.

Clean exposed panel faces according to manufacturer guidelines.

B. Remove metal filings and debris from panel surfaces daily to prevent surface rust.

C. Replace damaged panels that cannot be restored to original factory condition.

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