SECTION 13 3419

METAL BUILDING SYSTEMS

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LANL MASTER SPECIFICATION

This template must be edited for each project.  In doing so, specifier
must add job-specific requirements.  Brackets are used in the text to
indicate designer choices or locations where text must be supplied by
the designer.  Once the choice is made or text supplied, remove the
brackets.  The specifications must also be edited to delete
specification requirements for processes, items, or designs that are not
included in the project \-- and specifier's notes such as these.  To
seek a variance from requirements in the specifications that are
applicable, contact the Engineering Standards Manual
[Structural](http://engstandards.lanl.gov/POCs.shtml#struc)/[Architectural](http://engstandards.lanl.gov/POCs.shtml#arch)
POC. Please contact POC with suggestions for improvement as well.\
\
When assembling a specification package, include applicable
specifications from all Divisions, especially Division 1, General
requirements.\
\
Specification developed for ML-4 projects.  For ML-1, 2, and 3
applications, additional requirements and independent reviews should be
added if increased confidence in procurement or execution is desired;
see ESM Chapter 1 Section Z10 Specifications and Quality sections.

**Add requirements for IBC and LANL approval of offsite structural
fabricator as required by ESM Chapter 16. See also the 2006 edition of
the *Metal Building Systems Manual* published by MBMA.\
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1.  GENERAL

    1.  SECTION INCLUDES

        A.  Design requirements for metal building, foundation,
            materials, products, fabrication and installation of
            pre-engineered metal building.

    2.  RELATED SECTIONS

        A.  Concrete work is specified in Division 03.

        B.  Doors and finish hardware are specified in Division 08 & 09.

    3.  SYSTEM DESIGN CRITERIA AND PERFORMANCE REQUIREMENTS

        A.  General: Engineer, design, fabricate and erect the
            pre‑engineered metal building system to withstand loads from
            winds, seismic forces, gravity, structural movement
            including movement thermally induced, and to resist
            in‑service use conditions that the building will experience
            including exposure to weather, without failure or visible
            deformation.

            1.  Design each member to withstand stresses resulting from
                combinations of loads that produce the maximum stresses
                in that member.

            2.  Use design loads or combinations of loads as prescribed
                in MBMA\'s \"Design Practices Manual\" or as set forth
                herein, whichever is more demanding.

        B.  Design Loads and Criteria

            1.  Minimum Design Loads:

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a.  The spec writer shall specify design loads, load combinations, wind,
    seismic criteria, etc., based on Section 206, Design Loads, in the
    Civil Technical Standards.

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b.  Include collateral loads from suspended mechanical and electrical
    systems, from ceilings and all other construction suspended from or
    supported by the metal building.

c.  In load combination of dead load plus live load, use a minimum total
    dead load (including 10 psf future load) of 20 psf. In load
    combinations that include the effects of wind uplift or overturning,
    use a minimum total dead load of 7 psf.

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2.  Floor Loads

    a.  Design for a floor load of \[ \] psf, or for specific equipment
        loads, whichever is greater.

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C.  Foundations

    1.  Design foundation to match floor plan and details shown on
        architectural drawings. Coordinate details of foundation to
        match structural details of prefabricated building systems.

    2.  Design maximum bearing loads on footings to be less than those
        recommended by geotechnical engineering report. Geotechnical
        engineering report will be provided to Subcontractor by Los
        Alamos National Laboratory. Design floor slabs for maximum
        stated floor loading or fork lift wheel load, whichever produces
        the greatest slab thickness requirements.

    3.  Prepare all foundation design calculations under the supervision
        of a registered structural engineer.

D.  Structural Framing, Roof and Siding Panels: Design primary and
    secondary structural members and exterior covering materials for
    applicable loads and combinations of loads.

    1.  Structural Steel: AISC, \"Specification for Structural Steel
        Buildings Allowable Stress Design and Plastic Design\".

    2.  Cold‑Formed Steel: AISI, \"Specifications for the Design of Cold
        Formed Steel Structural Members\" and \"Design of Light Gauge
        Steel Diaphragms\" for design requirements and allowable
        stresses.

    3.  Welded Connections: AWS, \"Structural Welding Code\" for welding
        procedures.

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4.  SUBMITTALS

    A.  Submit the following in accordance with Section 01 3300,
        Submittal Procedures:

        1.  Detailed design calculations for foundation and structural
            building components prepared and sealed by a registered
            structural engineer. Calculations shall meet the design
            criteria given.

        2.  Manufacturer's catalog data, including performance and
            loading charts, specifications and installation instructions
            for building components and accessories.

        3.  Color samples of the following items: LANL Subcontract
            Technical Representative (STR) will review for color and
            texture only. Compliance with other requirements is the
            responsibility of the Subcontractor.

            a.  For initial selection, submit manufacturer's color
                charts or chips showing full range of colors, textures
                and patterns available for metal panels with factory
                applied finishes.

            b.  For verification purposes, submit 12-inch-long by actual
                width of roofing and siding panels in the profile,
                style, color and texture selected from the
                manufacturer's colors.

            c.  For initial selection, submit manufacturer's color
                charts or chips showing full range of colors available
                for sealants and closures.

        4.  Shop Drawings:

            a.  Shop drawings sealed by a registered structural
                engineer.

            b.  Shop drawings of the foundations and slabs indicating
                reinforcing and anchor bolt locations.

            c.  Shop drawings of the metal building indicating:

-   Fabrication and assembly of the structural frame in accordance with
    the AISC Manual of Steel Detailing.

-   Layout of siding and roofing panels, details of all edge conditions,
    joints, corners, custom profiles, supports, anchorages, trims,
    flashings, covering and trim, and accessory installations.

-   Window anchorage and flashing.

-   Doorframe anchorage.

    1.  Warranty:

        a.  Twenty-year manufacturer's written warranty on the exterior
            panel and trim finish. The finish shall be warranted against
            the following:

-   Crack, check, or peel.

-   Chalk in excess of a numeral rating of eight (ASTM S659).

-   Fade or change in color in excess of five units of color (ASTM
    D2244).

    a.  Ten-year warranty for weather-tight and watertight installation.

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    1.  Project record documents in accordance with Section 01 7839.

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    1.  QUALITY ASSURANCE

        A.  Manufacturer\'s Qualifications: Provide pre‑engineered metal
            buildings produced by a manufacturer with a minimum of 5
            years experience in the fabrication of pre‑engineered metal
            buildings of the type and quality required.

        B.  Erector\'s Qualifications: Pre‑engineered building shall be
            erected by a firm that has successful experience in the
            erection of pre‑engineered buildings similar to those
            required for this project, having completed a minimum of 5
            projects, and that has been licensed by the manufacturer of
            the building system.

    2.  DELIVERY, STORAGE AND HANDLING

        A.  Deliver prefabricated components, sheets, panels, and other
            manufactured items so they will not be damaged or deformed.
            Package metal sheets or panels for protection against
            transportation damage.

        B.  Exercise care in unloading, storing and erecting panels to
            prevent bending, warping, twisting and surface damage.

        C.  Stack materials on platforms or pallets, covered with
            tarpaulins or other suitable weather-tight ventilated
            covering. Store metal sheets or panels so that water
            accumulations will drain freely. Do not store sheets or
            panels in contact with other materials which might cause
            staining, denting or other surface damage.

2.  PRODUCTS

    1.  MATERIALS

        A.  Metals:

            1.  Hot‑Rolled Structural Shapes: ASTM A36 or A529.

            2.  Tubing: ASTM A500, Grade B.

            3.  Pipe: ASTM A53, Grade B.

            4.  Steel Members Fabricated from Plate or Bar Stock: ASTM
                A529, A570, or A572, 42,000 psi minimum yield strength.

            5.  Steel Members Fabricated by Cold Forming: ASTM A607,
                Grade 50.

            6.  Cold‑Rolled Carbon Steel Sheet: ASTM A568 and ASTM A336.

            7.  Hot‑Rolled Carbon Steel Sheet: ASTM A568 or ASTM A569.

            8.  Structural Quality Zinc-Coated (Galvanized) Steel Sheet:
                ASTM A446 with G90 coating, ASTM A525. \"Class\" to suit
                building manufacturer\'s standards.

            9.  Commercial Quality Zinc-Coated (Galvanized) Steel Sheet:
                ASTM A526 with G60 coating, ASTM A525.

            10. Aluminum-Coated Steel Sheets: ASTM A463 with Tl-40
                coating.

            11. Bolts for Structural Framing: ASTM A325 as necessary for
                design loads and connection details.

        B.  Paint and Coating Materials: Unless otherwise indicated,
            paint and coating materials shall comply with performance
            requirements of the Federal Specifications indicated. Unless
            specifically indicated otherwise, compliance with
            compositional requirements of the federal specifications
            indicated is not required.

            1.  Shop Primer for Ferrous Metal: Fast curing, lead-free,
                \"universal\" primer as selected by the manufacturer for
                resistance to normal atmospheric corrosion,
                compatibility with finish paint systems indicated and
                capability to provide a sound foundation for
                field-applied topcoats despite prolonged exposure.
                Comply with performance requirements of FS TT-P-645.

            2.  Shop Primer for Galvanized Metal Surfaces: Zinc
                dust-zinc oxide primer selected by the manufacturer for
                compatibility with substrate. Comply with performance
                requirements of MIL-DTL-24441/20.

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    1.  STRUCTURAL FRAMING

        A.  Fabricate steel frames from hot‑rolled structural steel.
            Provide built-up \"I-beam\" shape or open web type frames
            consisting of either tapered or parallel flange beams and
            tapered or straight columns. Provide frames factory welded
            and shop painted. Furnish frames complete with attachment
            plates, bearing plates, and splice members. Factory drill
            frames for bolted field assembly.

            1.  Provide length of span and spacing of frames as
                indicated. Slight variations in length of span and frame
                spacing may be acceptable if necessary to meet
                manufacturer\'s standard.

            2.  Provide endwall frames where noted on the floor plans.
                Use moment-resisting frames where noted on the floor
                plans.

        B.  Wind Bracing: Adjustable wind bracing using not less than
            1/2 inch diameter threaded steel rods; ASTM A36 or A572,
            Grade D.

        C.  Secondary Framing:

            1.  Roof Purlins, Sidewall and Endwall Girts: \"C\" or \"Z\"
                shaped sections fabricated from not less than 16 gauge
                (0.0598 inch) shop painted rolled formed steel.
                Fabricate purlin spacers from not less than 14 gauge
                (0.0747 inch) cold formed \"J\" sections.

            2.  Eave Struts: Unequal flange \"C\"-shaped sections formed
                to provide adequate backup for both siding and roof
                panels. Fabricate from not less than 16 gauge (0.0598
                inch) shop painted cold formed steel.

            3.  Flange and Sag Bracing: Minimum 1 5/8 inch angles
                fabricated from not less than 16 gauge (0.0598-inch)
                shop painted cold formed steel.

            4.  Base or Sill Angles: Angles fabricated from not less
                than 14 gauge (0.0747 inch) cold formed galvanized steel
                sections.

        D.  Bolts:

            1.  Provide high strength bolts, meeting ASTM A325
                specifications except when structural framing components
                are in direct contact with roofing and siding panels.
                Provide zinc‑plated or cadmium‑plated bolts when
                structural framing components are in direct contact with
                roofing and siding panels.

        E.  Shop Painting: Clean surfaces to be primed of loose mill
            scale, rust, dirt, oil, grease and other matter precluding
            paint bond. Follow procedures of SSPC‑SP3 for power tool
            cleaning, SSPC‑SP7 for brush‑off blast cleaning, and
            SSPC‑SP1 for solvent cleaning.

            1.  Prime structural steel primary and secondary framing
                members with the manufacturer\'s standard
                rust-inhibitive primer.

            2.  Prime galvanized members, after phosphoric acid
                pretreatment with manufacturer\'s standard zinc
                dust-zinc oxide primer.

    2.  METAL PANELS

        A.  General: Provide roofing, siding, liner and soffit sheets
            formed to the general profile or configuration customarily
            utilized by the metal building system manufacturer to meet
            the project requirements with metal thickness not less than
            24 gauge (0.0179 inch).

            1.  Zinc-Coated Steel Sheets for Liner and Siding:
                Structural quality hot-dip galvanized steel sheets, ASTM
                A446, Grade C, with G90 coating, ASTM A525.

                a.  Include appropriate surface treatment for maximum
                    finish performance.

            2.  Aluminized Coated Steel Sheets for Roofing: Drawing
                quality aluminum coated steel sheets, ASTM A463, with
                TI-40 coating.

        B.  Standing Seam Roof Panels: Manufacturer\'s standard
            factory-formed standing seam roof panel system designed for
            mechanical attachment of panels to roof purlins using a
            concealed clip. Form panels of 24 gauge aluminized coated
            steel sheets, ASTM A463, with T1-40 coating.

            1.  Clips: Not less than 16 gauge panel clips.

            2.  Cleats: Factory caulked, mechanically seamed cleats
                formed from 24 gauge galvanized steel, ASTM A463, with
                T1-40 coating.

        C.  Siding Panels: Manufacturer\'s standard factory‑formed panel
            system designed for mechanical attachment of panels to girts
            using exposed fasteners. Form panels of minimum 24 gauge
            zinc-coated steel sheets, ASTM A446, Grade C, with G90
            coating, ASTM A525. Include appropriate surface treatment
            for maximum finish performance.

        D.  Liner Panels: Manufacturer\'s standard factory-formed panel
            system designed for mechanical attachment of panels to girts
            using exposed fasteners. Form panels of minimum 24 gauge
            zinc-coated steel sheets, ASTM A446, Grade C, with G90
            coating, ASTM A525. Include appropriate surface treatment
            for maximum finish performance.

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> If lab benches, etc will be located backing up to liner panels,
> consider specifying liner panels to have flush finished surface. It's
> more expensive, but it may be the best solution.

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E.  Soffit Panels: Manufacturer\'s factory-formed, soffit panel system
    designed for mechanical attachment of panels using exposed
    fasteners. Form panels of minimum 26 gauge zinc-coated steel sheet,
    ASTM A446, Grade C, with G90 coating, ASTM A525. Include appropriate
    surface treatment for maximum finish performance.

F.  Fasteners: Manufacturer\'s standard self-tapping screws, bolts,
    nuts, self-locking rivets, self-locking bolts, end-welded studs, and
    other suitable fasteners as required to withstand design loads.

    1.  Provide metal-backed neoprene washers under heads of fasteners
        bearing on weather side of panels.

    2.  Use aluminum or stainless steel fasteners for exterior
        application and galvanized or cadmium plated fasteners for
        interior applications.

    3.  Locate and space fastenings in true vertical and horizontal
        alignment. Use proper type fastening tools to obtain controlled
        uniform compression for positive seal without rupture of
        neoprene washer.

    4.  Provide fasteners with heads matching color of siding sheets by
        means of plastic caps or factory applied coating.

G.  Accessories: Provide the following sheet metal accessories factory
    formed of the same material and finish as the corresponding roofing,
    siding and liner panels. Accessories include, but are not
    necessarily limited to:

    1.  Flashings.

    2.  Closers.

    3.  Fillers.

    4.  Metal expansion joints.

    5.  Ridge covers.

    6.  Fascias.

    7.  Gutters and downspouts.

H.  Flexible Closure Strips: Closed‑cell, expanded cellular rubber,
    self-extinguishing flexible closure strips. Cut or pre-mold closure
    strips to match corrugation configuration of roofing and siding
    sheets. Provide closure strips where indicated or necessary to
    ensure weathertight construction.

I.  Sealing Tape: Pressure sensitive 100 percent solids grey
    polyisobutylene compound sealing tape with release paper backing.
    Provide permanently elastic, non-sag, non-toxic, non-staining tape
    not less than 1/2 inch wide and 1/8 inch thick.

J.  Joint Sealant: One-part elastomeric polyurethane, polysulfide or
    silicon rubber sealant as recommended by the building manufacturer.

K.  Panel Finish: Provide one of the following as indicated:

    1.  Baked Enamel Finish: Shop‑applied baked enamel finish to
        galvanized steel liner panels, and related trim and accessory
        elements. Apply finish coat on the exposed face and
        manufacturers\' standard wash coat on the reverse face.

        a.  Clean galvanized steel with an alkaline compound, then treat
            with a zinc phosphate conversion coating, and seal with a
            chromic acid rinse.

        b.  Apply a baked-on thermo-setting synthetic enamel system,
            such as acrylic enamel or silicone polyester, to pretreated
            steel sheets, in one or more coats as standard with the
            manufacturer to achieve a minimum dry film thickness of one
            mil.

        c.  For roofing and siding, apply finish coat on exterior
            facings and manufacturer's standard wash coat on reverse
            face.

        d.  Provide colors as indicated or as selected by LANL STR from
            the manufacturer\'s standard colors.

    2.  Fluoropolymer Finish: Shop‑applied fluoropolymer finish to
        galvanized steel siding and soffit panels, and related trim and
        accessories elements. Apply finish coat on the exposed face and
        manufacturer\'s standard wash coat on the reverse face.

        a.  Clean galvanized steel with an alkaline compound, then treat
            with a zinc phosphate conversion coating, and seal with a
            chromic acid rinse.

        b.  Apply a 2 coat fluoropolymer coating system to pretreated
            steel. Coating shall consist of a primer applied to a dry
            film thickness of 0.15 mil to 0.25 mil, and a finish coat of
            polyvinyl fluoride or polyvinylidene fluoride applied to a
            dry film thickness of 0.80 mils to 1.3 mils.

        c.  Color as indicated or as selected by LANL STR from the
            manufacturer\'s standard colors.

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3.  ALUMINUM WINDOWS

    A.  Window Classification:

        1.  Commercial Windows: Provide preglazed window units complying
            with requirements of NAAMA Grade and Performance Class
            appropriate to the design wind velocity at project site
            listed elsewhere in this Section and for \"Commercial\" type
            buildings.

        2.  Window Types (Operation): Drawings indicate locations of
            operating sash:

            a.  Provide horizontal sliding units conforming to NAAMA
                HS-C20 for commercial grade horizontal sliding windows.

    B.  Aluminum Extrusions: ASTM B221 aluminum extrusions of alloy and
        temper recommended by the manufacturer for strength, corrosion
        resistance, and application of required finish, but not less
        than 22,000 psi ultimate tensile strength and not less than
        0.062 inch thickness at any location for main frame and sash
        members.

        1.  Aluminum finish: Medium natural anodized, NAAMM AA-C22A31.

        2.  Provide thermal-break construction of window units. Metal
            frame and sash members exposed on the exterior shall be
            separated from metal parts exposed on the interior by a
            continuous gasket or filler of rubber or plastic, locked
            into construction.

        3.  Mullions: Provide mullions between adjacent window units,
            fabricated of extruded aluminum matching the finish of
            window units.

    C.  Glass Types and Qualities:

        1.  Dual glazed insulating glass made with Type 1, Class 1,
            Quality q3, clear float glass.

    D.  Insect Screens: Provide removable insect screen unit on each
        operable exterior sash, with color matching window sash
        extrusions.

        1.  Plastic Fabric Insect Screen: Plastic coated glass fiber
            mesh, FS L-S-125, 18 by 14, woven and fused.

4.  SHEET METAL ACCESSORIES

    A.  General: Provide sheet metal accessories with coating to match
        coated steel roofing, liner and siding panels.

    B.  Gutters: Form gutters in sections not less than 8 feet in
        length, complete with end pieces, outlet tubes and other special
        pieces as may be required. Join sections with riveted and
        soldered or sealed joints. Provide expansion-type slip joint at
        center of runs. Furnish gutter supports spaced at 36 inches
        o.c., constructed of same metal as gutters. Provide bronze,
        copper, or aluminum wire ball strainers at each outlet. Finish
        to match roof facia and rake.

    C.  Downspouts: Form downspouts in sections approximately 10 feet
        long, complete with elbows and offsets. Join sections with not
        less than 1 1/2 inch telescoping joints. Provide fasteners,
        designed to securely hold downspouts not less than\
        1 inch away from walls; locate fasteners at top and bottom and
        at approximately 5 feet on center in between. Finish to match
        wall panels.

    D.  Wall Louvers: Provide wall louvers of the size and design
        indicated, fabricated of not less than 18 gauge steel. Fold or
        bead blades at edges, set at an angle that will exclude driving
        rains, and secure to frames by riveting or welding. Finish to
        match wall panels.

        1.  Provide vertical mullions for louvers 4 feet and more in
            width, with not less than one mullion for each 4 feet of
            width.

        2.  Provide flanges on interior face of frames where air intake
            or exhaust louvers are indicated to be connected with
            mechanically-operated dampers or metal ductwork.

        3.  Provide bird screens of 1/2 inch by 1/2 inch galvanized
            steel mesh in rewirable frames on exterior face of louvers.
            Secure screens with clips to ensure ease of removal for
            cleaning and rewiring. Fabricate screens and frames of same
            type metal as louvers.

5.  FABRICATION

    A.  General: Design prefabricated components and necessary field
        connections required for erection to permit easy assembly and
        disassembly. Fabricate components in such a manner that once
        assembled, they may be disassembled, repackaged and reassembled
        with a minimum amount of labor.

        1.  Clearly and legibly mark each piece and part of the assembly
            to correspond with previously prepared erection drawings,
            diagrams and instruction manuals.

    B.  Structural Framing: Shop-fabricate structural framing components
        to the indicated size and section complete with base plates,
        bearing plates and other plates required for erection, welded in
        place. Provide required holes for anchoring or connections
        either shop drilled or punched to template dimensions.

        1.  Shop Connections: Power riveted, high strength bolted or
            welded shop connections.

        2.  Field Connections: Bolted field connections using high
            strength bolts (ASTM A minimum specification).

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3.  EXECUTION

    1.  FOUNDATION CONSTRUCTION

        A.  Construct foundations/floor slab to lines and grades shown
            on architectural and civil drawings to meet pre-fabricated
            metal building requirements. Construct foundations in accord
            with specification sections or excavation, backfill,
            concrete, reinforcing and formwork.

        B.  Coordinate construction of the foundation with the
            anticipated installation requirements of the prefabricated
            building system. Set all anchor bolts in the formwork prior
            to placement of concrete by the use of templates. Field
            drilled structural anchors or excessive field burning of
            base plates is prohibited.

        C.  Place and finish floor slabs in accord with the
            specification section or concrete. Coordinate all embedded
            item with foundation construction prior to placement of
            concrete.

        D.  Remove concrete that is defective, below minimum strength
            requirements as exhibited by the test cylinders, as required
            by the LANL STR. Replace defective concrete at no cost to
            the University.

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    1.  ERECTION OF STRUCTURAL FRAMING

        A.  Framing: Erect structural framing true to line, level and
            plumb, rigid and secure. Level base plates to a true even
            plane with full bearing to support structures, set with
            double-nutted anchor bolts. Use a non-shrinking grout to
            obtain uniform bearing and to maintain a level base line
            elevation. Moist cure grout for not less than 7 days after
            placement.

        B.  Purlins and Girts: Provide rake or gable purlins with tight
            fitting closure channels and fascias. Locate and space wall
            girts to suit door and window arrangements and heights.
            Secure purlins and girts to structural framing and hold
            rigidly to a straight line with sag rods.

        C.  Bracing: Provide diagonal rod or angle bracing in both roof
            and sidewalls as required by building analysis.

            1.  Where diaphragm strength of roof or wall covering is
                adequate to resist wind forces and connections are
                detailed to provide diaphragm strength, rod or other
                forms of bracing will not be required.

        D.  Framed Openings: Provide shapes of proper design and size to
            reinforce openings and to carry loads and vibrations
            imposed, including equipment furnished under mechanical or
            electrical work. Securely attach to building structural
            frame.

    2.  ROOFING AND SIDING

        A.  General: Arrange and nest sidelap joints so that prevailing
            winds blow over, not into, lapped joints. Lap ribbed or
            fluted sheets one full rib corrugation. Apply panels and
            associated items for neat and weather-tight enclosure. Avoid
            \"panel creep\" or J application not true to line. Protect
            factory finishes from damage.

            1.  Field cutting of panels by torch is not permitted.

            2.  Provide weatherseal under ridge cap. Flash and seal roof
                panels at eave and rake with rubber, neoprene, or other
                closures to exclude weather.

        B.  Standing Seam Roof Panel System: Fasten roof panels to
            purlins with concealed clip in accordance with the
            manufacturer\'s instructions.

            1.  Install clips at each support using self-drilling
                fasteners.

            2.  At end laps of panels install tape caulk between panels.

            3.  Install factory-caulked cleats at standing seam joints.
                Machine seam cleats to the panels to provide a
                weather-tight joint.

        C.  Siding and Liner Panels: Apply elastomeric sealant
            continuously between metal base channel (sill angle) and
            concrete and elsewhere as necessary for waterproofing.
            Handle and apply sealant and back-up in accordance with the
            sealant manufacturer\'s recommendations.

            1.  Align bottoms of wall panels and fasten panels with
                blind rivets, bolts or self-tapping screws. Fasten
                flashings, trim around openings, and similar elements
                with self-tapping screws. Fasten window and door frames
                with machine screws or bolts. When building height
                requires 2 rows of panels at gable ends, align lap of
                gable panels over wall panels at eave height.

            2.  Install screw fasteners with power tool having
                controlled torque adjusted to compress neoprene washer
                tightly without damage to washer, screw threads, or
                panels. Install screws in predrilled holes.

        D.  Sheet Metal Accessories: Install gutters, downspouts,
            ventilators, louvers, and other sheet metal accessories in
            accordance with manufacturer\'s recommendations for positive
            anchorage to building and weather-tight mounting. Adjust
            operating mechanism for precise operation.

        E.  Aluminum Windows: Anchor windows securely in place. Seal
            entire perimeter of each unit with elastomeric sealant used
            for panels. Adjust and lubricate operating sash (vents) and
            hardware for proper operation. Clean surfaces of window
            units and install screens.

        F.  Cleaning and Touch-Up: Prior to application of finish coats,
            clean component surfaces of matter which could preclude
            paint bond.

            1.  Touch-up abrasions, marks, skips or other defects to
                shop-primed surfaces with same type materials as shop
                primer.

END OF SECTION

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Do not delete the following reference information:

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FOR LANL USE ONLY

This project specification is based on LANL Master Specification 13 3419
Rev. 1, dated May 28, 2008.