13 34 19.pdf
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This is a technical specification section (Section 13 34 19) for metal building systems for the P-1550 SOF Marine Raider Battalion/Company/Team Facilities project, revised June 22, 2026.
The specification establishes comprehensive requirements for pre-engineered metal building design and construction, including rigid clear-span primary frames without interior columns, manufacturer-standard secondary purlins, and metal roof panel assemblies. Key structural performance requirements mandate compliance with UFC 3-301-01 and ASCE 7 standards, with design capability for 144 mph ultimate wind speed (54 PSF), Risk Category II exposure. Thermal performance specifications require metal roof panel assemblies achieving maximum U-factor of 0.034 and minimum R-value of 29, achieved through two layers of unfaced fiberglass insulation (upper layer R-19, lower layer R-10, 9 inches total thickness). Metal roof panels must be 0.024-inch, 24-gauge galvanized steel with 350-degree double-lock standing seams, factory-applied polyvinylidene fluoride finish in slate gray, and comply with ASTM A653/A653M Grade C specifications. Air infiltration must not exceed 0.04 cfm/sq.ft. per ASTM E1680, and water penetration is prohibited per ASTM E1646 testing. All primary and secondary structural members, fasteners, accessories, and flashing must be single-source from the metal building system manufacturer. The manufacturer must demonstrate minimum five years' experience and MBMA membership; engineering services require a licensed engineer with minimum four years' experience in metal building design. Twenty-year no-dollar-limit warranties are required for building system performance, roof weather-tightness, and finish protection, with repair response times of 32 hours for structural systems and 24 hours for roof leaks. Submittals require government approval for manufacturer qualifications, detail shop drawings, erection plans, product data, design calculations, test reports, and system component certificates.
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P-1550 SOF MARINE RAIDER eProjects WON: 1701820 BATTALION / COMPANY / TEAM FACILITIES 8 May 2026
SECTION 13 34 19
METAL BUILDING SYSTEMS
08/20, CHG 1: 02/21
PART 1 GENERAL
1.1 REFERENCES
The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.
ALUMINUM ASSOCIATION (AA)
AA ADM (2020) Aluminum Design Manual
AA ASD1 (2017; Errata 2017) Aluminum Standards and Data
AMERICAN ARCHITECTURAL MANUFACTURERS ASSOCIATION (AAMA)
AAMA 2605 (2022) Voluntary Specification, Performance Requirements and Test Procedures for Superior Performing Organic Coatings on Aluminum Extrusions and Panels
AAMA/WDMA/CSA 101/I.S.2/A440 (2017) North American Fenestration Standard/Specification for Windows, Doors, and Skylights
AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)
AISC 325 (2017) Steel Construction Manual
AISC 341 (2016) Seismic Provisions for Structural Steel Buildings
AISC 360 (2016) Specification for Structural Steel Buildings
AMERICAN IRON AND STEEL INSTITUTE (AISI)
AISC/AISI 121 (2007) Standard Definitions for Use in the Design of Steel Structures
AISI D100 (2017) Cold-Formed Steel Design Manual
AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)
ASCE 7 (2017) Minimum Design Loads for Buildings and Other Structures
ASCE 7-16 (2017; Errata 2018; Supp 1 2018) Minimum Design Loads and Associated Criteria for Buildings and Other Structures
SECTION 13 34 19 Page 1
REVISED 22 JUNE 2026
AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING
ENGINEERS (ASHRAE)
ASHRAE 90.1 - IP (2019) Energy Standard for Buildings Except Low-Rise Residential Buildings
ASHRAE 90.1 - SI (2019) Energy Standard for Buildings Except Low-Rise Residential Buildings
AMERICAN WELDING SOCIETY (AWS)
AWS A5.1/A5.1M (2012) Specification for Carbon Steel Electrodes for Shielded Metal Arc Welding
AWS D1.1/D1.1M (2020; Errata 1 2021) Structural Welding Code - Steel
AWS D1.3/D1.3M (2018) Structural Welding Code - Sheet Steel
ASTM INTERNATIONAL (ASTM)
ASTM A36/A36M (2019) Standard Specification for Carbon Structural Steel
ASTM A53/A53M (2024) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A123/A123M (2024) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
ASTM A153/A153M (2016a) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware
ASTM A193/A193M (2025) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service and Other Special Purpose Applications
ASTM A307 (2023) Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength
ASTM A463/A463M (2015; R 2020; E 2020) Standard Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip Process
ASTM A475 (2022) Standard Specification for Metallic-Coated Steel Wire Strand
ASTM A500/A500M (2023) Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
ASTM A501/A501M (2021) Standard Specification for
SECTION 13 34 19 Page 2
Hot-Formed Welded and Seamless Carbon Steel Structural Tubing
ASTM A529/A529M (2019) Standard Specification for High-Strength Carbon-Manganese Steel of Structural Quality
ASTM A563 (2015) Standard Specification for Carbon and Alloy Steel Nuts
ASTM A563M (2007; R 2013) Standard Specification for Carbon and Alloy Steel Nuts (Metric)
ASTM A572/A572M (2021; E 2021) Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel
ASTM A606/A606M (2018) Standard Specification for Steel Sheet and Strip, High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, with Improved Atmospheric Corrosion Resistance
ASTM A653/A653M (2025a) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
ASTM A755/A755M (2018) Standard Specification for Steel Sheet, Metallic Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Process for Exterior Exposed Building Products
ASTM A780/A780M (2020) Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
ASTM A792/A792M (2025a) Standard Specification for Steel Sheet, 55% Aluminum-Zinc Alloy-Coated by the Hot-Dip Process
ASTM A924/A924M (2022a) Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process
ASTM A992/A992M (2020) Standard Specification for Structural Steel Shapes
ASTM A1008/A1008M (2021a) Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardenable
ASTM A1011/A1011M (2018a) Standard Specification for Steel Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength
SECTION 13 34 19 Page 3
ASTM B117 (2019) Standard Practice for Operating Salt Spray (Fog) Apparatus
ASTM B209 (2014) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
ASTM B209M (2014) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate (Metric)
ASTM B221 (2021) Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
ASTM B221M (2021) Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes (Metric)
ASTM B695 (2021) Standard Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
ASTM C273/C273M (2020) Standard Test Method for Shear Properties of Sandwich Core Materials
ASTM C518 (2021) Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
ASTM C553 (2013; R 2019) Standard Specification for Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial Applications
ASTM C612 (2014; R 2019) Standard Specification for Mineral Fiber Block and Board Thermal Insulation
ASTM C665 (2017) Standard Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing
ASTM C920 (2018; R 2024) Standard Specification for Elastomeric Joint Sealants
ASTM C991 (2016) Flexible Glass Fiber Insulation for Metal Buildings
ASTM C1289 (2022) Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board
ASTM C1363 (2019) Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus
ASTM D522/D522M (2017) Mandrel Bend Test of Attached
SECTION 13 34 19 Page 4
Organic Coatings
ASTM D523 (2014; R 2018) Standard Test Method for Specular Gloss
ASTM D714 (2002; R 2017) Standard Test Method for Evaluating Degree of Blistering of Paints
ASTM D822 (2013; R 2018) Filtered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings
ASTM D968 (2017) Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive
ASTM D1056 (2020) Standard Specification for Flexible Cellular Materials - Sponge or Expanded Rubber
ASTM D1308 (2002; R 2013) Effect of Household Chemicals on Clear and Pigmented Organic Finishes
ASTM D1621 (2016) Standard Test Method for Compressive Properties of Rigid Cellular Plastics
ASTM D1622/D1622M (2014) Apparent Density of Rigid Cellular Plastics
ASTM D1667 (2017) Standard Specification for Flexible Cellular Materials - Poly (Vinyl Chloride) Foam (Closed-Cell)
ASTM D2244 (2016) Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
ASTM D2247 (2015) Testing Water Resistance of Coatings in 100% Relative Humidity
ASTM D2794 (1993; R 2019) Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)
ASTM D3363 (2005; E 2011; R 2011; E 2012) Film Hardness by Pencil Test
ASTM D4214 (2007; R 2015) Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films
ASTM D5359 (2015) Standard Specification for Glass Cullet Recovered from Waste for Use in Manufacture of Glass Fiber
ASTM D6226 (2015) Standard Test Method for Open Cell
SECTION 13 34 19 Page 5
Content of Rigid Cellular Plastics
ASTM DEFONLINE (2008) ASTM Online Dictionary of Engineering Science and Technology
ASTM E84 (2025) Standard Test Method for Surface Burning Characteristics of Building Materials
ASTM E96/E96M (2022) Standard Test Methods for Gravimetric Determination ofWater Vapor Transmission Rate of Materials
ASTM E119 (2020) Standard Test Methods for Fire Tests of Building Construction and Materials
ASTM E136 (2019a) Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
ASTM E283 (2019) Standard Test Method for Determining the Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen
ASTM E331 (2000; R 2016) Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference
ASTM E1592 (2025) Standard Test Method for Structural Performance of Sheet Metal Roof and Siding Systems by Uniform Static Air Pressure Difference
ASTM E1646 (1995; R 2018) Standard Test Method for Water Penetration of Exterior Metal Roof Panel Systems by Uniform Air Pressure Difference
ASTM E1680 (2016) Standard Test Method for Rate of Air Leakage Through Exterior Metal Roof Panel Systems
ASTM F436/F436M (2019) Standard Specification for Hardened Steel Washers Inch and Metric Dimensions
ASTM F844 (2019) Standard Specification for Washers, Steel, Plain (Flat), Unhardened for General Use
ASTM F1554 (2020) Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength
ASTM F1852 (2014) Standard Specification for "Twist Off" Type Tension Control Structural
SECTION 13 34 19 Page 6
Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength
ASTM F3125/F3125M (2019) Standard Specification for High Strength Structural Bolts and Assemblies, Steel and Alloy Steel, Heat Treated, Inch Dimensions 120 ksi and 150 ksi Minimum Tensile Strength, and Metric Dimensions 830 MPa and 1040 MPa Minimum Tensile Strength
ASTM G152 (2013; R 2021) Standard Practice for Operating Open Flame Carbon Arc Light Apparatus for Exposure of Nonmetallic Materials
ASTM G153 (2013; R 2021) Standard Practice for Operating Enclosed Carbon Arc Light Apparatus for Exposure of Nonmetallic Materials
FM GLOBAL (FM)
FM 4471 (2025) Class I Panel Roofs
METAL BUILDING MANUFACTURERS ASSOCIATION (MBMA)
MBMA MBSM (2018) Metal Building Systems Manual
NATIONAL ASSOCIATION OF ARCHITECTURAL METAL MANUFACTURERS (NAAMM)
NAAMM AMP 500 (2006) Metal Finishes Manual
NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)
NFPA 80 (2022) Standard for Fire Doors and Other Opening Protectives
NFPA 252 (2022) Standard Methods of Fire Tests of Door Assemblies
NATIONAL ROOFING CONTRACTORS ASSOCIATION (NRCA)
NRCA RoofMan (2020) The NRCA Roofing Manual
SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION
(SMACNA)
SMACNA 1793 (2012) Architectural Sheet Metal Manual, 7th Edition
SOCIETY FOR PROTECTIVE COATINGS (SSPC)
SSPC Paint 15 (1999; E 2004) Steel Joist Shop Primer/Metal Building Primer
SSPC Painting Manual (2002) Good Painting Practice, Steel Structures Painting Manual, Volume 1
SECTION 13 34 19 Page 7
SSPC SP 2 (2018) Hand Tool Cleaning
STEEL WINDOW INSTITUTE (SWI)
SWI AGSW (2002) Architect's Guide to Steel Windows
U.S. ARMY CORPS OF ENGINEERS (USACE)
EM 385-1-1 (2024) Safety -- Safety and Occupational Health (SOH) Requirements
U.S. DEPARTMENT OF DEFENSE (DOD)
UFC 3-110-03 (2012; with Change 5, 2020) Roofing
UFC 3-301-01 (2023; with Change 6, 2026) Structural Engineering
UFC 3-301-02 (2020) Design of Risk Category V Structures, National Strategic Military Assets
UFC 4-010-01 (2018; with Change 1, 2020) DoD Minimum Antiterrorism Standards for Buildings
UL SOLUTIONS (UL)
UL 580 (2006; Reprint Apr 2024) UL Standard for Safety Tests for Uplift Resistance of Roof Assemblies
UNDERWRITERS LABORATORIES (UL)
UL Bld Mat Dir (updated continuously online) Building Materials Directory
1.2 GENERAL REQUIREMENTS
1.2.1 Design Parameters
Design and construct pre-engineered metal buildings of size, shape, height, fenestration, siting, and configuration indicated. Coordinate site utility services, accessibility requirements, vehicular and pedestrian access, mechanical, electrical, plumbing and fire protection requirements, interior construction and finishes, and such other items as may be necessary for a complete, functional building.
1.2.2 Structural Performance
Provide metal building systems capable of withstanding the effects of gravity loads and the following loads and stresses within the limits and conditions indicated.
1.2.2.1 Engineering
Design metal building systems conforming to procedures described in
MBMA MBSM.
SECTION 13 34 19 Page 8
1.2.2.2 Design Loads
Design and construct to the requirements of UFC 3-301-01 , Structural Engineering.
1.2.3 Thermal Performance
Provide insulated metal panel assemblies with the following maximum U-factors when assemblies are tested or calculated according to ASHRAE 90.1 - SI ASHRAE 90.1 - IP Appendix A, and minimum R-values for opaque elements when tested according to ASTM C1363 or ASTM C518.
1.2.3.1 Metal Roof Panel Assemblies
a. U-Factor: U-0.034 maximum
b. R-Value: R-29 minimum
Roof insulation consists of two layers of unfaced fiberglass insulation, with the upper layer having an R-value of 19 and the lower layer having an R-value of 10. The installed thickness is 9 inches for an 8.5 inch purlin and achieves a total installed R-value of 29. Size layer thicknesses and widths to completely fill cavity depths and shapes.
1.2.4 Air Infiltration for Metal Roof Panels
Air leakage through assembly must not exceed 0.04 cfm/sq.ft. of roof area when lab tested according to ASTM E1680 at negative test-pressure difference of 1.57 lb/sq.ft. .
1.2.5 Water Penetration for Metal Roof Panels
No water penetration when tested according to ASTM E1646 at test-pressure difference of 2.86 lbf/sq.ft .
1.2.6 Specular Gloss
Finished roof surfaces to have a specular gloss value of 30 plus or minus 5 at an angle of 60 degrees when measured in accordance with ASTM D523.
1.2.7 Wind-Uplift Resistance
Design for wind-uplift resistance in accordance with UFC 3-301-01 .
Submit a DELEGATED DESIGN with sealed calculations and shop drawings prepared by a registered professional engineer.
Furnish metal building systems that resist dead, live, uplift and lateral loads. Marine Corps Base Camp Lejeune must resist a 144 mile per hour, ultimate design wind speed, 54 PSF, Risk Category II, Surface Roughness Category C, Exposure Category C lateral load. Comply with UFC 3-301-01, NCSBC and ASCE 7 as applicable for building system designs and components. Assembly design responsibility is delegated to the Contractor and incorporates specific properties and structural capabilities of selected products and manufacturers.
Primary steel structures have a lateral drift of L/400.
Supplement delegated design shop drawings with metal building system
SECTION 13 34 19 Page 9 structural computations. Tie general manufacturer data of appurtenant members utilized to project specific conditions. Specify fastening patterns and connections.
Submit metal building design reactions for gravity loads, uplift, shear and thrust. Individually specify dead, live and wind load reactions.
Primary member cross sections, secondary member cross sections and clear dimensions are minimums. Provide greater member cross sections, lateral bracing and cross bracing as dictated by a delegated design. Coordinate the delegated design with the Instruments of Service to accommodate scheduled personnel doors, overhead doors, windows and similar penetrations.
Design members for both balanced and unbalanced live load conditions.
Design and detail column bases as pinned supports and assume they are incapable of transferring moment.
Assume roof and wall panels provide no diaphragm strength in resisting lateral loads. Frame door, window and other wall and roof openings with continuous secondary members.
Design for wind loads in accordance with ASCE 7 and UFC 3-110-03 . Comply with the pressurization standards of UL 580 , Class 90. Comply with the pressurization standards of FM 4471 , Class 1-120 for roof slopes with a 1.75:12 pitch or more. Divide metal roof panel systems supported by either solid decking or purlins into field, edge and corner pressure zones. Stipulate requirements for additional structural members and fasteners. Evaluate pressure zones in accordance with the load sequence stipulated by ASTM E1592. Resist the design pressures indicated, and determine panel bending and clip to panel strength. Interpolate capacities for gauge, span and loading. Account for prying forces from eccentric clip loading when computing uplift loads on fasteners.
Calculate fastener holding strength based on substrate thickness or length of embedment. Use safety factors appropriate for the material properties involved. The construction assembly must match the pull out resistance determined by ASTM E1592, but may be attached to either solid decking or purlin substrates as permitted by UFC 3-110-03 .
1.2.8 Erection Plan
Provide plans and a written erection/lifting procedure with required plans clearly showing the intended sequence and method of erection in accordance with EM 385-1-1 "Safety - Safety and Health Requirements". Indicate required crane lifting requirements, temporary support structures, member size and locations of braced or guyed temporary supports, and locations of bracing or guys anchor points. Clearly define the required framing sequence and conditions necessary to ensure the structure is maintained in a properly braced and stable condition throughout the complete erection process.
1.3 DEFINITIONS
a. Bay: Dimension between main frames measured normal to frame (at centerline of frame) for interior bays, and dimension from centerline of first interior main frame measured normal to end wall (outside face of end-wall girt) for end bays.
b. Clear Span: Distance between supports of beams, girders, or trusses
SECTION 13 34 19 Page 10
(measured from lowest level of connecting area of a column and a rafter frame or knee).
c. Eave Height: Vertical dimension from finished floor to eave (the line along the sidewall formed by intersection of the planes of the roof and wall).
d. Terminology Standard: Refer to MBMA "Metal Building Systems Manual" for definitions of terms for metal building system construction not otherwise defined in this Section or in referenced standards.
1.4 SYSTEM DESCRIPTION
General: Provide a complete, integrated set of mutually dependent components and assemblies that form a metal building system capable of withstanding structural and other loads, thermally induced movement, and exposure to weather without failure or infiltration of water into building interior. Include primary and secondary framing, metal panels, and accessories complying with requirements indicated.
Provide metal building system of size and with spacing, slopes, and spans indicated.
1.4.1 Primary Frame Type
a. Rigid Clear Span: Solid-member, structural-framing system without interior columns.
1.4.2 Secondary Frame Type
Provide manufacturer's standard purlins.
1.4.3 Eave Height
Eave height must be as indicated by nominal height on Drawings.
1.4.4 Bay Spacing
Bay Spacing must be as indicated in the drawings .
1.4.5 Roof Slope
Roof slope must be as indicated in the drawings .
1.5 SUBMITTALS
Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-01 Preconstruction Submittals
Manufacturer's Qualifications ; G
SD-02 Shop Drawings
Detail Drawings ; G
SECTION 13 34 19 Page 11
Erection Plan ; G
SD-03 Product Data
Manufacturer's Catalog Data ; G
Recycled Content for Structural Steel Shapes and Plates ; S
Recycled Content for Steel Pipe ; S
Recycled Content for Steel Sheet Materials ; S
Recycled Content for Insulation Materials ; S
SD-04 Samples
Coil Stock , 12 inches long by the actual panel width; G
Roof Panels , 12 inches long by actual panel width; G
Fasteners ; G
Metal Closure Strips 10 inches long of each type; G
Insulation , approximately 8 by 11 inches ; G
Color , 4 by 4 inches ; G
SD-05 Design Data
Manufacturer's Descriptive and Technical Literature ; G
Manufacturer's Building Design Analysis ; G
Lateral Force Calculations ; G
SD-06 Test Reports
Test Reports ; G
Coatings and Base Metals ; G
Factory Color Finish Performance Requirements ; G
SD-07 Certificates
System Components ; G
Coil Stock Certificates ; G
Aluminized Steel Repair Paint ; G
Galvanizing Repair Paint ; G
Enamel Repair Paint ; G
Qualification of Manufacturer ; G
Qualification of Erector ; G
SECTION 13 34 19 Page 12
SD-08 Manufacturer's Instructions
Installation of Roof panels ; G
Shipping, Handling, and Storage ; G
1.6 QUALITY ASSURANCE
1.6.1 Pre-Erection Conference
After submittals are received and approved but before metal building system work, including associated work, is performed, the Contracting Officer will hold a pre-erection conference to review the following:
a. The detail drawings , specifications, and manufacturer's descriptive and technical literature .
b. Finalize construction schedule and verify availability of materials, erector's personnel, equipment, and facilities needed to make progress and avoid delays.
c. Methods and procedures related to metal building system erection, including, but not limited to: qualification of manufacturer , qualification of erector , manufacturer's catalog data , manufacturer's building design analysis , lateral force calculations , written instructions and test reports . Lateral force calculations must include all analysis and confirmation of system components required to transfer lateral forces to the foundation.
d. Support conditions for compliance with requirements, including alignment between and erection of structural members.
e. Flashing, special roofing and siding details, roof penetrations, openings, and condition of other construction that will affect the metal building system, including coatings and base metals , factory color finish performance requirements , system components , and coil stock certificates .
f. Governing regulations and requirements for, certificates, insurance, tests and inspections if applicable.
g. Temporary protection requirements for metal panel assembly during and after installation.
h. Samples of roof panels , aluminized steel repair paint , galvanizing repair paint , and enamel repair paint .
1.6.1.1 Pre-Roofing Installation Conference
After structural framing system erection and approval but before roofing, siding, insulation and vapor barrier work, including associated work, is performed; the Contracting Officer will hold a pre-roofing and siding conference to review the following:
a. Examine purlins and formed shapes conditions for compliance with requirements, including flatness and attachment to structural members.
b. Review structural limitations of purlins and formed shapes during
SECTION 13 34 19 Page 13 construction and after roofing.
c. Review flashings, special roof details, roof drainage, roof penetrations, roof equipment curbs, and condition of other construction that will affect the metal building system.
d. Review temporary protection requirements for metal roof panels' assembly during and after installation.
e. Review roof observation and repair procedures after metal building system erection.
1.6.2 Manufacturer's Technical Representative
The representative must have authorization from manufacturer to approve field changes and be thoroughly familiar with the products, erection of structural framing and installation of roof panels in the geographical area where construction will take place.
1.6.3 Manufacturer's Qualifications
Metal building system manufacturer must have a minimum of five years experience as a qualified manufacturer and a member of MBMA of metal building systems and accessory products.
Provide engineering services by an authorized currently licensed engineer in the geographical area where construction will take place, having a minimum of four years experience as an engineer knowledgeable in building design analysis, protocols and procedures for the "Metal Building Systems Manual" ( MBMA MBSM); ASCE 7-16 , the building code in the geographic area where the construction will take place and ASTM E1592. Provide certified engineering calculations using the products submitted for:
a. Roof Wind Loads with basic wind speed, exposure category, co-efficient, importance factor, designate type of facility, negative pressures for each zone, methods and requirements of attachment.
b. Roof Dead and Live Loads
c. Collateral Loads
d. Foundation Loads
e. Roof Snow Load
f. Seismic Loads
1.6.4 Qualification of Erection Contractor
An experienced erector who has specialized in erecting and installing work similar in material, design, and extent to that indicated for this Project and must be approved and certified by the metal building system manufacturer.
1.6.5 Single Source
Obtain primary and secondary components and structural framing members, each type of metal roof panel assemblies, clips, closures and other accessories from the standard products of the single source from a single
SECTION 13 34 19 Page 14 manufacturer to operate as a complete system for the intended use.
1.6.6 Welding
Qualify procedures and personnel according to AWS A5.1/A5.1M , AWS D1.1/D1.1M , and AWS D1.3/D1.3M .
1.6.7 Structural Steel
Comply with AISC 325 , AISC 360 , for design requirements and allowable stresses.
1.6.8 Cold-Formed Steel
Comply with AISC/AISI 121 and AISI D100 for design requirements and allowable stresses.
1.6.9 Fabrication
Fabricate and finish metal panels and accessories at the factory to greatest extent possible, by manufacturer's standard procedures and processes and as necessary to fulfill indicated performance requirements.
Comply with indicated profiles with dimensional and structural requirements. Provide metal panel profile, including major ribs and intermediate stiffening ribs, if any, for full length of panel. Aluminum and aluminum-alloy sheet and plate must conform to ASTM B209. Fabricate metal panel side laps with factory-installed captive gaskets or separator strips that provide a tight seal and prevent metal-to-metal contact, in a manner that will seal weather-tight and minimize noise from movements within panel assembly.
Sheet Metal Accessories: Fabricate flashing and trim to comply with recommendations in SMACNA 1793 that apply to the design, dimensions, metal, and other characteristics of item indicated:
a. Form exposed sheet metal accessories that are without excessive oil canning, buckling, and tool marks and that are true to line and levels indicated, with exposed edges folded back to form hems.
b. End Seams: Fabricate nonmoving seams with flat-lock seams. Form seams and seal with epoxy seam sealer. Rivet joints for additional strength.
c. Sealed Joints: Form non-expansion but movable joints in metal to accommodate elastomeric sealant to comply with SMACNA standards.
d. Conceal fasteners and expansion provisions where possible. Exposed fasteners are not allowed on faces of accessories exposed to view.
e. Fabricate cleats and attachment devices of size and metal thickness recommended by SMACNA or by metal building system manufacturer for application, but not less than thickness of metal being secured.
1.6.10 Finishes
Comply with NAAMM AMP 500 for recommendations for applying and designating finishes.
Appearance of Finished Work: Noticeable variations in same piece are not
SECTION 13 34 19 Page 15 acceptable. Variations in appearance of adjoining components are acceptable if they are within the range of approved Samples and are assembled or installed to minimize contrast.
1.7 SHIPPING, HANDLING AND STORAGE
1.7.1 Delivery
Package and deliver components, sheets, metal panels, and other manufactured items so as not to be damaged or deformed and protected during transportation and handling.
1.7.2 Storage
Stack and store metal panels horizontally on platforms or pallets, covered with suitable weather-tight and ventilated covering to ensure dryness, with positive slope for drainage of water. Store in a manner to prevent bending, warping, twisting, and surface damage. Do not store metal panels in contact with other materials that might cause staining, denting, or other surface damage. Retain strippable protective covering on metal panel for entire period up to metal panel installation.
1.7.3 Protection of Materials
Protect foam-plastic insulation as follows:
a. Do not expose to sunlight, except to extent necessary for period of installation and concealment.
b. Protect against ignition at all times. Do not deliver foam-plastic insulation materials to project site before installation time.
Complete installation and concealment of plastic materials as rapidly as possible in each area of construction to minimize ultraviolet exposure.
1.8 PROJECT CONDITIONS
1.8.1 Weather Limitations
Proceed with installation preparation only when existing and forecasted weather conditions permit Work to proceed without water entering into existing panel system or building.
1.8.2 Field Measurements
1.8.2.1 Established Dimensions for Foundations
Comply with established dimensions on approved anchor-bolt plans, established foundation dimensions, and proceed with fabricating structural framing. Do not proceed without verifying field measurements. Coordinate anchor-bolt installation to ensure that actual anchorage dimensions correspond to established dimensions.
1.8.2.2 Established Dimensions for Metal Panels
Where field measurements cannot be made without delaying the Work, either establish framing and opening dimensions and proceed with fabricating metal panels without field measurements, or allow for field trimming metal panels. Coordinate construction to ensure that actual building
SECTION 13 34 19 Page 16 dimensions, locations of structural members, and openings correspond to established dimensions.
1.8.2.3 Verification Record
Verify locations of all framing and opening dimensions by field measurements before metal panel fabrication and indicate measurements on Shop Drawings.
1.9 COORDINATION
Coordinate final design and placement of foundation between structural engineer of record, geotechnical engineer, MBMA and Contractor.
Coordinate size and location of concrete foundations and casting of anchor-bolt inserts into foundation walls and footings. Concrete, reinforcement, and formwork requirements are specified in section on
CAST-IN-PLACE CONCRETE.
Coordinate metal panel assemblies with rain drainage work, flashing, trim, and construction of supports and other adjoining work to provide a leak-proof, secure, and non-corrosive installation.
1.10 WARRANTY
1.10.1 Building System Warranty
Furnish manufacturer's no-dollar-limit warranty for the metal building system. The warranty period is to be no less than 20 years from the date of acceptance of the work and be issued directly to the Government. The warranty must provide that if within the warranty period, the metal building system shows evidence of deterioration resulting from defective materials or workmanship, correcting of any defects is the responsibility of the metal building system manufacturer. Repairs that become necessary because of defective materials and workmanship while metal building system is under warranty are to be performed within 32 hours after notification, unless additional time is approved by the Contracting Officer. Failure to perform repairs within 32 hours of notification will constitute grounds for having emergency repairs performed by others and will not void the warranty.
1.10.2 Roof System Weather-Tightness Warranty
Furnish manufacturer's no-dollar-limit warranty for the metal panel system. The warranty period is to be no less than 20 years from the date of acceptance of the work and be issued directly to the Government.
The warranty is to provide that if within the warranty period the roof panel system shows evidence of corrosion, perforation, rupture, lost of weather-tightness or excess weathering due to deterioration of the panel system resulting from defective materials and correction of the defective workmanship is to be the responsibility of the metal building system manufacturer.
Repairs that become necessary because of defective materials and workmanship while roof panel system is under warranty are to be performed within 24 hours after notification, unless additional time is approved by the Contracting Officer. Failure to perform [temporary] repairs within 24 hours of notification will constitute grounds for having emergency repairs performed by others and not void the warranty. Immediate follow-up and
SECTION 13 34 19 Page 17 completion of permanent repairs must be performed within 30 days from date of notification.
1.10.3 Roof and Wall Panel Finish Warranty
Furnish manufacturer's no-dollar-limit warranty for the metal panel system. The warranty period is to be no less than 20 years from the date of acceptance of the work and be issued directly to the Government.
The warranty is to provide that if within the warranty period the metal panel system shows evidence of checking, delaminating cracking, peeling, chalk in excess of a numerical rating of eight, as determined by ASTM D4214 test procedures; or change colors in excess of five CIE or Hunter units in accordance with ASTM D2244 or excess weathering due to deterioration of the panel system resulting from defective materials and finish or correction of the defective workmanship is to be the responsibility of the metal building system manufacturer.
Liability under this warranty is exclusively limited to replacing the defective coated materials.
Repairs that become necessary because of defective materials and workmanship while roof and wall panel system is under warranty are to be performed within 32 hours after notification, unless additional time is approved by the Contracting Officer. Failure to perform repairs within 32 hours of notification will constitute grounds for having emergency repairs performed by others and not void the warranty.
PART 2 PRODUCTS
2.1 STRUCTURAL FRAMING MATERIALS
2.1.1 Steel Shapes and Plates
Wide flange and WT shapes: ASTM A992/A992M ; ASTM A572/A572M or ASTM A529/A529M . Angles, Channels and Plates: ASTM A36/A36M, ASTM A572/A572M or ASTM A529/A529M . Provide structural steel shapes and plates containing a minimum of 80 percent recycled content. Submit data identifying percentage of recycled content for structural steel shapes and plates .
2.1.2 Steel Pipe
ASTM A36/A36M, ASTM A53/A53M, ASTM A572/A572M or ASTM A529/A529M . Provide steel pipe containing a minimum of 50 percent recycled content. Submit data identifying percentage of recycled content for steel pipe .
2.1.3 Cold-Formed and Hot Formed Hollow Structural Sections
Cold formed: ASTM A500/A500M or ASTM B221, ASTM B221M. Hot-formed:
ASTM A501/A501M .
2.1.4 Structural-Steel Sheet
Hot-rolled, ASTM A1011/A1011M or cold-rolled, ASTM A1008/A1008M .
2.1.5 Metallic-Coated Steel Sheet
ASTM A653/A653M , ASTM A606/A606M .
SECTION 13 34 19 Page 18
2.1.6 Metallic-Coated Steel Sheet Pre-painted with Coil Stock Coating
Steel sheet metallic coated by the hot-dip process and pre-painted by the coil-coating process to comply with ASTM A755/A755M .
a. Zinc-Coated (Galvanized) Steel Sheet: ASTM A653/A653M , and
ASTM A123/A123M .
b. Aluminum-Zinc Alloy-Coated Steel Sheet: ASTM A792/A792M , and
ASTM A463/A463M .
2.1.7 High-Strength Bolts, Nuts, and Washers
ASTM F3125/F3125M , heavy hex steel structural bolts; ASTM A563 heavy hex carbon-steel nuts; and ASTM F436/F436M hardened carbon-steel washers.
Finish: Plain.
Tension-Control, High-Strength Bolt-Nut-Washer Assemblies: ASTM F1852, heavy-hex-head steel structural bolts with spline.
Finish: Plain.
2.1.8 Non-High-Strength Bolts, Nuts, and Washers
ASTM A307, ASTM A563, and ASTM F844.
Finish: Plain.
2.1.9 Anchor Rods
ASTM F1554.
a. Configuration: Straight.
b. Nuts: ASTM A563 hex carbon steel.
c. Plate Washers: ASTM A36/A36M carbon steel.
d. Washers: ASTM F436/F436M hardened carbon steel.
e. Finish: Plain.
2.1.10 Threaded Rods
ASTM A193/A193M .
a. Nuts: ASTM A563MASTM A563 hex carbon steel.
b. Washers: ASTM A36/A36M carbon steel.
c. Finish: Plain.
2.1.11 Primer
SSPC-Paint 15, Type I, red oxide.
SECTION 13 34 19 Page 19
2.2 FABRICATION
2.2.1 General
Comply with MBMA MBSM - "Metal Building Systems Manual": Chapter IV, Section 9, "Fabrication and Erection Tolerances."
2.3 STRUCTURAL FRAMING
2.3.1 General
Clean all framing members to remove loose rust and mill scale. Provide 1 shop coat of primer to an average dry film thickness of 1 mil according to SSPC SP 2 . Balance of painting and coating procedures must conform to SSPC Paint 15 and SSPC Painting Manual .
2.3.2 Primary Framing
Manufacturer's standard structural primary framing system includes transverse and lean-to frames; rafter, rakes, and canopy beams; and corner columns; and wind bracing designed to withstand required loads and specified requirements. Provide frames with attachment plates, bearing plates, and splice members. Provide frame span and spacing indicated.
Shop fabricate framing components by welding or by using high-strength bolts to the indicated size and section with base-plates, bearing plates, stiffeners, and other items required. Cut, form, punch, drill, and weld framing for bolted field erection.
a. Rigid Clear-Span Frames: I-shaped frame sections fabricated from shop-welded, built-up steel plates or structural-steel shapes.
Interior columns are not permitted.
d. Exterior Column Type: Tapered.
e. Rafter Type: Uniform depth.
2.3.3 Secondary Framing
Manufacturer's standard secondary framing members, including purlins, eave struts, flange bracing, base members, gable angles, clips, headers, jambs, and other miscellaneous structural members. Fabricate framing from cold-formed, structural-steel sheet or roll-formed, metallic-coated steel sheet pre-painted with coil coating, unless otherwise indicated.
Shop fabricate framing components by roll-forming or break-forming to the indicated size and section with base-plates, bearing plates, stiffeners, and other plates required for erection. Cut, form, punch, drill, and weld secondary framing for bolted field connections to primary framing.
a. Purlins: C or Z-shaped sections; fabricated from steel sheet, built-up steel plates, or structural-steel shapes; minimum depth as required to comply with system performance requirements.
SECTION 13 34 19 Page 20
c. Eave Struts: Unequal-flange, C-shaped sections; fabricated from steel sheet, built-up steel plates, or structural-steel shapes; to provide adequate backup for metal panels.
d. Flange Bracing: Structural-steel angles or cold-formed structural tubing to stiffen primary frame flanges.
e. Sag Bracing: Structural-steel angles.
g. Purlin and s: Steel sheet. Provide galvanized clips where clips are connected to galvanized framing members.
j. Miscellaneous Structural Members: Manufacturer's standard sections fabricated from cold-formed, structural-steel sheet; built-up steel plates; or zinc-coated (galvanized) steel sheet; designed to withstand required loads.
2.3.4 Bracing
Provide adjustable wind bracing as follows:
a. Rods: ASTM A36/A36M; ASTM A572/A572M ; or ASTM A529/A529M .
b. Cable: ASTM A475, extra-high-strength grade, zinc-coated; with threaded end anchors.
c. Angles: Fabricated from structural-steel shapes to match primary framing, of size required to withstand design loads.
d. Rigid Portal Frames: Fabricate from shop-welded, built-up steel plates or structural-steel shapes to match primary framing; of size required to withstand design loads.
e. Fixed-Base Columns: Fabricate from shop-welded, built-up steel plates or structural-steel shapes to match primary framing; of size required to withstand design loads.
f. Diaphragm Action of Metal Panels: Design metal building to resist wind forces through diaphragm action of metal panels.
g. Bracing: Provide wind bracing using any method specified above, at manufacturer's option , provided bracing does not obstruct openings or open walls as illustrated in the Instruments of Service .
2.4 PANEL MATERIALS
2.4.1 Steel Sheet
a. Roof panels are 0.024 inch, 24 gauge galvanized steel and fabricated with 50,000 PSI sheet coil conforming to ASTM A653/A653M , Grade C, Class G90, and ASTM A924/A924M galvanized or ASTM A792/A792M , CS Type B or C galvalume. Prefabricate machine seamed roof panels with 350 degree double lock standing seams. Cleats and bearing plates are heavy gauge galvanized steel, aluminum, stainless steel or similar non corrosive, compatible metal formed into panel clips. Panel clips accommodate thermal movement by floating 1 inch parallel and perpendicular to seams. Rigid insulation thermal blocks extend perpendicular to and 1 inch beyond each side of purlins, have a compressive strength of 25 PSI and an R-value of 5. Furnish factory
SECTION 13 34 19 Page 21 installed sealant or vinyl weatherseal along panel lap lengths.
Provide sealants, mastics, gaskets, fillers, closure strips and similar accessories at end laps, side laps, rakes, eaves and penetrations. Shop fabricated flashing and trims match panel metals and finishes. Furnish roof panel transitions and accessories including ridge cap, flashing, rake and eave trims.
2.4.1.1 Panel Fabrication
oll-form steel panels to the specified profile, with gauge and depth as indicated. Steel sheets must contain a minimum recycled content of 25 percent. Provide data identifying percentage of recycled content for steel sheet materials . Material must be plumb and true, and within the tolerances listed:
a. Galvanized Steel Sheet conforming to ASTM A653/A653M and AISI D100 .
b. Individual panels to have continuous length to cover the entire length of any unbroken roof slope with no joints or seams and formed without warping, waviness, or ripples that are not part of the panel profile and free of damage to the finish coating system.
c. Provide panels with thermal expansion and contraction consistent with the type of system specified;
profile and coverage to be a minimum height of 2.25 inches with 350 degree machine rolled seam and width from manufacturer's standard.
Smooth, flat Surface Texture.
2.4.2 Finish
All panels are to receive a factory-applied polyvinylidene fluoride finish conforming to AAMA 2605 and consisting of a baked-on top-coat with a manufacturer's recommended prime coat conforming to the following:
a. Metal Preparation: All metal is to have the surfaces carefully prepared for painting on a continuous process coil coating line by alkali cleaning, hot water rinsing, application of chemical conversion coating, cold water rinsing, sealing with acid rinse, and thorough drying.
b. Prime Coating: A base coat of epoxy paint, specifically formulated to interact with the top-coat, is to be applied to the prepared surfaces by roll coating to a dry film thickness of 0.20 plus 0.05 mils. This prime coat must be oven cured prior to application of finish coat.
c. Exterior Finish Coating: Apply the finish coating over the primer by roll coating to dry film thickness of 0.80 plus 0.05 mils for a total dry film thickness of 1.00 plus 0.10 mils. This finish coat must be oven-cured.
d. Interior Finish Coating: Apply a wash-coat on the reverse side over the primer by roll coating to a dry film thickness of 0.30 plus 0.05 mils for a total dry film thickness of 0.50 plus 0.10 mils. The wash-coat must be oven-cured.
SECTION 13 34 19 Page 22
e. Color : Roof panel is slate gray as indicated in the Marine Corps Base Camp Lejeune, Base Exterior Architectural Plan, Stone Bay, MARSOC.
f. Physical Properties: Coating must conform to the industry and manufacturer's standard performance criteria as listed by the following certified test reports:
Chalking: ASTM DEFONLINE Color Change and Conformity: ASTM D2244 Weatherometer: ASTM G152, ASTM G153 and ASTM D822 Humidity: ASTM D2247 and ASTM D714 Salt Spray: ASTM B117 Chemical Pollution: ASTM D1308 Gloss at 60 degrees: ASTM D523 Pencil Hardness: ASTM D3363 Reverse Impact: ASTM D2794 Flexibility: ASTM D522/D522M Abrasion: ASTM D968 Flame Spread: ASTM E84
2.4.3 Repair Of Finish Protection
Repair paint for enameled metal panel must be compatible paint of the same formula and color as the specified finish furnished by the metal panel manufacturer, conforming to ASTM A780/A780M .
2.5 FASTENERS
2.5.1 General
Type, material, corrosion resistance, size and sufficient length to penetrate the supporting member a minimum of 1 inch with other properties required to fasten miscellaneous metal framing members to substrates in accordance with the metal panel manufacturer's and ASCE 7-16 requirements.
Finish exposed rivets and fasteners to match substrate colors encountered.
2.5.2 Exposed Fasteners
Fasteners for metal panels to be corrosion resistant coated steel, aluminum, stainless steel, or nylon capped steel compatible with the sheet panel or flashing and of a type and size recommended by the manufacturer to meet the performance requirements and design loads. Fasteners for accessories to be the manufacturer's standard. Provide an integral metal washer matching the color of attached material with compressible sealing EPDM gasket approximately 3/32 inch thick.
2.5.3 Screws
Screws to be corrosion resistant coated steel, aluminum or stainless steel being the type and size recommended by the manufacturer to meet the performance requirements.
2.5.4 Rivets
Rivets to be closed-end type, corrosion resistant coated steel, aluminum or stainless steel where watertight connections are required.
SECTION 13 34 19 Page 23
2.5.5 Attachment Clips
Fabricate clips from steel hot-dipped galvanized in accordance with ASTM A653/A653M or Series 300 stainless steel. Size, shape, thickness and capacity as required meeting the insulation thickness and design load criteria specified.
2.6 ACCESSORIES
2.6.1 General
All accessories to be compatible with the metal panels; sheet metal flashing, trim, metal closure strips , caps and similar metal accessories must not be less than the minimum thickness specified for the metal panels. Exposed metal accessories/finishes to match the panels, except as otherwise indicated. Molded foam rib, ridge and other closure strips to be non-absorbent closed-cell or solid-cell synthetic rubber or pre-molded neoprene to match configuration of the panels.
2.6.2 Insulation
Glass-Fiber Blanket Insulation: ASTM C665, Type I, blankets without membrane coverings. Provide insulation materials containing the following minimum percentage of recycled content by weight: 20 percent glass cullet complying with ASTM D5359. Provide data identifying percentage of recycled content for insulation materials .
2.6.2.1 Polyethylene Vapor Retarder
Install polyethylene vapor retarder membrane over entire roofsurface. Use fully compatible polyethylene tape to seal the edges of the sheets to provide a vapor tight membrane. Lap sheets not less than 6 inch . Provide sufficient material to avoid inducing stresses in sheets due to stretching or binding. All tears or punctures visible in the finished surface, at any time during the construction process, must be sealed with polyethylene tape. Vapor retarder color is black.
2.6.3 Rubber Closure Strips
Closed-cell, expanded cellular rubber conforming to ASTM D1056 and ASTM D1667; extruded or molded to the configuration of the specified metal panel and in lengths supplied by the metal panel manufacturer.
2.6.4 Metal Closure Strips
Factory fabricated closure strips to be the same material, thickness, color, finish and profile of the specified panel.
2.6.5 2.6.6 Joint Sealants
2.6.5.1 Sealants
Sealants are to be an approved gun type for use in hand or air-pressure caulking guns at temperatures above 40 degrees F (or frost-free application at temperatures above 10 degrees F with minimum solid content of 85 percent of the total volume. Sealant is to dry with a tough, durable surface skin which permits it to remain soft and pliable underneath, providing a weather-tight joint. No migratory staining is permitted on
SECTION 13 34 19 Page 24 painted or unpainted metal, stone, glass, vinyl, or wood.
Prime all joints to receive sealants with a compatible one-component or two-component primer as recommended by the metal panel manufacturer.
2.6.5.2 Shop-Applied
Sealant for shop-applied caulking must be an approved gun grade, non-sag one component polysulfide or silicone conforming to ASTM C920, Type II, and with a curing time to ensure the sealant's plasticity at the time of field erection.
2.6.5.3 Field-Applied
Sealant for field-applied caulking must be an approved gun grade, non-sag one component polysulfide or two-component polyurethane with an initial maximum Shore A durometer hardness of 25, and conforming to ASTM C920, Type II. Color to match panel colors.
2.6.5.4 Tape Sealant
Pressure sensitive, 100 percent solid with a release paper backing;
permanently elastic, non-sagging, non-toxic and non-staining as approved by the metal panel manufacturer.
2.7 SHEET METAL FLASHING AND TRIM
2.7.1 Fabrication
Shop fabricate sheet metal flashing and trim where practicable to comply with recommendations in SMACNA 1793 that apply to design, dimensions, metal, and other characteristics of item indicated. Obtain field measurements for accurate fit before shop fabrication.
Fabricate sheet metal flashing and trim without excessive oil canning, buckling, and tool marks and true to line and levels indicated, with exposed edges folded back to form hems.
2.8 FINISHES
2.8.1 General
Comply with NAAMM AMP 500 for recommendations for applying and designating finishes.
2.8.2 Appearance of Finished Work
Variations in appearance of abutting or adjacent pieces are acceptable if they are within one-half of the range of approved Samples. Noticeable variations in the same piece are not acceptable.
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