Guide Specifications
2012 Master Format™ Section 07 42 13.19
2012 Master Format™ Section 07 41 13.23
Metl-Span® LS-36™ Insulated Metal Roof and Wall Panel
PART 1 – GENERAL
1.1 Work Included
A. Pre-insulated metal panel cladding where indicated on the drawings. Also included are all
necessary trims, fasteners, sealants and gaskets 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 with compatible joinery.
2. Extruded aluminum trim related to the walls and its intersection with adjacent
materials.
3. Sealants between panels and their intersection.
1.2 Related Section
A.
B.
C.
D.
E.
F.
G.
Section 01 81 13 – Sustainable Design Requirements for LEED general requirements
Section 05 12 00 – Structural Steel Framing
Section 05 40 00 – Cold Formed Metal Framing
Section 07 62 00 – Sheet Metal Flashing and Trim
Section 07 92 00 – Joint Sealants
Section 07 71 10 – Manufactured Roof Specialties
Section 13 34 19 – Metal Building Systems
1.3 References
A. American Architectural Manufacturer’s Association (AAMA): www.aamanet.org:
1. AAMA 501.2 – Quality Assurance and Diagnostic Water Leakage Field Check of
Installed Storefronts, Curtain Walls, and Sloped Glazing Systems.
2. AAMA 621 – Voluntary Specifications for High Performance Organic Coatings
on Coil Coated Architectural Hot Dipped Galvanized (HDG) & Zinc-Aluminum
Coated Steel Substrates.
3. AAMA 809.2 – Voluntary Specification Non-Drying Sealants.
B. American Society of Civil Engineers (ASCE): www.asce.org/codes-standards:
ASCE 7 – Minimum Design Loads for Buildings and Other Structures.
C. American Society for Testing and Materials (ASTM)
D.
E.
F.
G.
1. 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.
2. ASTM A 792/A 792M – Standard Specification for Steel Sheet, 55% AluminumZinc Alloy-Coated by the Hot-Dip Process.
3. ASTM C 920 – Specification for Elastomeric Joint Sealants.
4. ASTM C 1363 – Standard Test Method for Thermal Performance of Building
Materials and Envelope Assemblies by Means of a Hot Box Apparatus.
5. ASTM D 2244 – Test Method for Calculation of Color Differences from
Instrumentally Measured Color Coordinates.
6. ASTM D 4214 – Test Methods for Evaluating Degree of Chalking of Exterior
Paint Films.
7. ASTM E 72 – Standard Test Methods of Conducting Strength Tests of Panels for
Building Construction.
8. ASTM E 84 – Test Methods for Surface Burning Characteristics of Building
Materials.
9. 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.
10. 10. ASTM E 331 – Standard Test Method for Water Penetration of Exterior
Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure
Difference.
11. 11. ASTM E 1592 – Standard Test Method for Structural Performance of Sheet
Metal Roof and Siding Systems by Uniform Static Air Pressure Difference.
Factory Mutual (FM)
1. FM Approval Standard 4880 – Class 1 Fire Rating of Insulated Wall, Ceiling and
Roof Panels
International Accreditation Service (IAS): www.iasonline.org:IAS AC 472 Accreditation
Criteria for Inspection Programs for Manufacturers of Metal Building Systems, Part B.
ICC Evaluation Service (ICC-ES): www.icc-es.org:ICC-ES AC 04 Acceptance Criteria
for Sandwich Panels.
Green Building Council (USGBC)Leadership in Energy and Environmental Design
(LEED) Green Building Rating System.
1.4 Performance Requirements
A. Structural Performance: Provide metal panel assemblies capable of withstanding the
effects of indicated loads and stresses within limits and under conditions indicated, as
determined by ASTM E 72 applied in accordance with IES AC 04, Section 4, Panel Load
Test Option or Section 5, Panel Analysis Option:
1. Wall Panel Wind Suction Testing: Certify capacity of metal panels by actual
testing of proposed assembly per ASTM E 1592 or ASTM E 72.
2. Deflection Limits: Withstand inward and outward wind-load design pressures in
accordance with applicable building code with maximum deflection of [1/120]
[1/180] [1/240] of the span with no evidence of failure.
3. Seismic Performance: Comply with ASCE 7, Section 9, “Earthquake Loads.”
B. Wall Panel Thermal Performance:
Thermal-resistance (R) value indicated, per ASTM C 1363 at a mean temperature of 75
deg. F (24 deg. C) heat flow horizontal, utilizing test specimen of minimum 64 sq. ft.
(5.9 m2) incorporating at least two side joints, and not including air films.
C. Wall Panel Air Infiltration, ASTM E 283:
1. Maximum 0.04 cfm/sq. ft. (0.20 L/s per sq. m) at static-air-pressure difference of
1.52 lbf/sq. ft. (75 Pa).
2. Maximum 0.051 cfm/sq. ft. (0.26 L/s per sq. m) at static-air-pressure difference of
6.24 lbf/sq. ft. (300 Pa).
3. Maximum 0.066 cfm/sq. ft. (0.33 L/s per sq. m) at static-air-pressure difference of
12 lbf/sq. ft. (575 Pa).
D. Wall Panel Water Penetration Static Pressure, ASTM E 331:No uncontrolled water
penetration at a static pressure of 20 lbf/sq. ft. (958 Pa)
E. Fire:Surface Burning Characteristics: The insulated core shall have been tested in
accordance with ASTM E84 for surface burning characteristics. The core shall have a
maximum flame
spread of 25 and a smoke developed rating of 450.
1.5 Quality Assurance
A. Installer Qualifications: Installed by a contractor with a minimum of five (5) years’
experience with this type of construction, and documentation indicating successful
completion of contracts for projects of similar size, scope and materials.
B. Manufacturer’s Qualifications: The manufacturer shall have a minimum of ten (10)
years’ experience in production of factory foamed-in-place insulated metal panels.
1.6 Submittals
A. Complete shop drawings, including elevations, fastening patterns and sections of each
condition shall be submitted for approval prior to fabrication. Such drawings shall also
include material type, metal thickness, paint finish and manufacturer’s installation
suggestions.
B. Submit under provisions of Section 01 33 00.
C. 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.
D. Selection Samples: For each product specified, two complete sets of color chips
representing manufacturer’s full range of available colors and patterns.
E. Panel Samples: Submit 1′-0″ (30.48 cm) by full width sample panel indicating the metal,
texture and finish proposed.
F. LEED Submittals:
1. SS – Sustainable Sites
2.
3.
4.
5.
6.
a. SS Credit 7.2: Heat Island Effect
i.
Solar Reflectance Index (SRI) for low sloped and/or steep sloped
roof application.-Any color from Metl-Span standard color chart.
EA – Energy and Atmosphere
a. EA Credit 1: Optimize Energy Performance
i.
Demonstrating percentage of performance improvement that meets
or surpasses ASHRAE/IESNA Standard 90.1-2004.
b. EA Credit 2: On-Site Renewable Energy
i.
Using the CFR Insul-Solar product in conjunction with the CFR
Roof Panel. Renewable system as a percentage of the
buildings annual cost per ASHRAE/IESNA Standard 90.1-2004 or
US DOE Commercial Buildings Energy Consumption Survey
Database.
MR – Material and Resource
a. MR Credit 4.1 & 4.2: Recycled Content
i.
Percentage weight of post-consumer and pre-consumer recycled
content – use materials with recycled content.
ii.
Recycled content value of product assembly by weight.
iii. Indicate total value (cost) of each product used.
IEQ – Indoor Environmental Quality
a. IEQ Credit 4.1: Low-Emitting Materials – Adhesives and Sealants
i.
Product data on adhesives and sealants to comply with standards of
South Coast Air Quality Management District Rule #1168.
ii.
Product data for paint and coatings have no VOC’s.
WE – Water Efficiency
a. WE Credit 1 & 2: Water Efficient Landscaping and Innovative
Wastewater Technology
i.
Demonstrated reduction in irrigation water by 50% from calculated
mid-summer base line case.
ii.
Demonstrated reduction in potable used for building sewage
conveyance by 50%.
Manufacturer’s Certificates: Certify products meet or exceed specified
requirements.
1.7 Warranty
A. Submit manufacturer’s written two (2) year limited warranty providing panels to be
free from defects in materials and workmanship, beginning from the date of substantial
completion excluding coil coatings (paint finishes) that are covered under a separate
warranty.
B. 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.
1.8 Finish Warranty
A. Submit Manufacturer’s forty (40) year limited warranty on the exterior paint finish for
adhesion to the metal substrate and thirty (30) year limited warranty on the exterior paint
finish for chalk and fade.
Note to Specifier: No warranty is offered for the interior painted surface of the panel.
PART 2 – PRODUCTS
2.1 Acceptable Manufacturer
A. LS-36 Insulated Metal Roof & Wall Panels as manufactured by Metl-Span of Lewisville,
TX, 75057, USA, Phone: (972) 221-6656, Fax: (972) 420-9382, Email:
panel@metlspan.com Website: www.metlspan.com.
2.2 Panel Design
A. Lap Seam, Exposed Fastener, Foamed-Insulation-Core Metal Roof & Panels: Structural
metal panels consisting of exterior metal sheet with three major tapered ribs and two
minor ribs between each major rib, and interior metal sheet, with factory foamed-in-place
polyisocyanurate core in thermally-separated profile, with tongue-and-groove panel
edges,
attached to supports using exposed fasteners.
2.3 Materials
A. Aluminum-Zinc Alloy-Coated Steel Sheet: ASTM A 792/A 792M, structural quality,
Grade 50, Coating Class AZ50 (Grade 340, Coating Class AZM150), prepainted by the
coil-coating process per ASTM A 755/A 755M.
B. Exterior Face Sheet: 0.0185 inch/26 gage (0.48 mm), 0.023 inch/24 gage (0.60 mm),
0.029 inch/22 gage (0.76 mm) coated thickness, with smooth stucco embossed surface.
C. Interior Face Sheet: 0.0185 inch/26 gage (0.48 mm), 0.023 inch/24 gage (0.60 mm),
0.029 inch/22 gage (0.76 mm) coated thickness, with stucco embossed surface and
planked profile.
D. Panel Width: 36 inches (914 mm).
E. Panel Thickness: 1-1/2 inch (38 mm), 2 inch (51 mm), 2.5 inch (64 mm), 3 inch (76mm)]
[4 inch (102 mm), 5 inch (127 mm), 6 inch (152 mm). As required to meet performance
requirements.
F. Foam core shall be continuously foamed-in-place, zero ODP and zero VOC closed cell
polyurethane.
2.4 Finishes
A. 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 70% PVDF
Fluoropolymer coating in manufacturer’s standard colors.
Note to Specifier: Thick mil coatings for aggressive environments are available at extra
cost. Siliconized Polyester is also available. Consult the factory or website at
metlspan.com for complete information.
B. The interior 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.
2.5 Metal Wall Panel Accessories
A. General: Provide complete metal panel assemblies incorporating trim, copings, fasciae,
gutters and downspouts, and miscellaneous flashings. Provide required fasteners, closure
strips, and sealants as indicated in manufacturer’s written instructions.
B. Flashing and Trim: Match material, thickness, and finish of metal panel face sheet.
C. Panel Fasteners: Self-tapping screws and other acceptable fasteners recommended by
metal panel manufacturer. Provide corrosion-resistant fasteners with heads matching
color of metal panels by means of factory-applied coating, with weathertight resilient
washers.
D. Joint Sealers:
1. VOC Content of Interior Sealants: Sealants used inside the weatherproofing
system shall comply with the following limits for VOC content when calculated
according to 40 CFR 59, Subpart D (EPA Method 24): Architectural Sealants:
250 g/L.
2. Tape Sealers: Manufacturer’s standard non-curing butyl tape, AAMA 809.2.
3. Concealed Joint Sealant: Non-curing butyl, AAMA 809.2.
4. Elastomeric Joint Sealant: Urethane sealant, single-component, ASTM C 920
Type S, Grade NS, Class 25, Use NT, A, M, G, O.
2.6 Fabrication
A. General: Provide factory fabricated and finished metal panels, trim, and accessories
meeting performance requirements, indicated profiles, and structural requirements.
B. Fabricate metal panel joints configured to accept sealant tape providing weather tight seal
and preventing metal-to-metal contact and minimizing noise resulting from thermal
movement.
PART 3 – EXECUTION
3.1 Examination
A. Examine metal panel system substrate with Installer present. Inspect for erection
tolerances and other conditions that would adversely affect installation of metal panels.
1. Inspect framing that will support insulated metal panels to determine if support
components are installed as indicated on approved shop drawings and are within
tolerances acceptable to metal panel manufacturer and installer. Confirm
presence of acceptable framing members at recommended spacing to match
installation requirements of metal panels.
2. Panel Support Tolerances: Confirm that metal panel supports are within
tolerances acceptable to metal panel manufacturer but not greater than the
following:
a. 1/4 inch (6 mm) in 20 foot (6100 mm) in any direction.
b. 3/8 inch (9 mm) over any single roof plane.
c. At Girt Spacing 10 feet (3048 mm) or More: 1/4 inches (6 mm), out only.
d. At Girt Spacing Less Than 10 feet (3048 mm): 1/8 inches (3 mm), out
only.
B. Correct out-of-tolerance work and other deficient conditions prior to proceeding with
insulated metal panel installation.
3.2 Delivery, Storage and Handling
A. Protect products of metal panel system during shipping, handling, and storage to prevent
staining,
denting, deterioration of components, or other damage. Protect panels and trim bundles
during
shipping. Protect painted surfaces with a strippable protective covering before shipping.
1. Deliver, unload, store, and erect metal panels and accessory items without
misshaping panels or exposing panels to surface damage from weather or
construction operations.
2. Store in accordance with Manufacturer’s written instructions. Provide wood
collars for stacking and handling in the field.
3. Shield foam insulated metal panels from direct sunlight until installation.
3.3 Installation
A. Lap-Seamed, Exposed-Fastener Foamed-Insulation-Core Metal Panels: Install metal
panel system in accordance with manufacturer’s written instructions, approved shop
drawings, and project drawings. Install metal panels in orientation, sizes, and locations
indicated. Anchor panels and other components securely in place. Provide for thermal
and structural movement.
B. Attach panels to metal framing using screws, fasteners, sealants, and adhesives
recommended for application by metal panel manufacturer.
1. Fasten metal panels to supports with fasteners at each location indicated on
approved shop drawings, at spacing and with fasteners recommended by
manufacturer.
2. Cut panels in field where required using manufacturer’s recommended methods.
3. Provide weatherproof jacks for pipe and conduit penetrating metal panels.
4. Dissimilar Materials: Where elements of metal panel system will come into
contact with dissimilar materials, treat faces and edges in contact with dissimilar
materials as recommended by metal panel manufacturer.
C. Attach panel flashing trim pieces to supports using recommended fasteners and joint
sealers.
D. Joint Sealers: Install tape sealers and liquid sealants where indicated and where required
for weatherproof performance of metal panel assemblies.
1. Seal panel base assembly, openings, panel head joints, and perimeter joints using
joint sealers indicated in manufacturer’s instructions.
2. Seal wall panel joints utilizing tape sealer and vapor seal bead of non-curing
butyl; apply continuously without gaps in accordance with manufacturer’s written
instructions, approved shop drawings, and project drawings.
3. Prepare joints and apply sealants per requirements of Division 07 Section “Joint
Sealants.”
3.4 Damaged Material
A. Replace damaged panels and other components of work that cannot be repaired by finish
touch-up or similar minor repair.
B. 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.
Note to Specifier: The use of touch-up paint is not recommended for minor surface
scratches. However, it is recommended to always use touch-up paint if the scratch goes
to bare metal. When using touch-up paint, it should be limited to small areas. Touch-up
paint will never match coil-coated finishes’ longevity, color and gloss.
3.5 Cleaning
A. Replace damaged panels and other components of work, which cannot be repaired by
finish touch-up or similar minor repair.
B. Wipe finished surfaces clean of any filings caused by drilling or cutting to prevent rust
staining.
C. Protective film on trim should be removed before exposure to sunlight.
All specifications and designs are subject to change without notice.