Design, fabricate and install preformed metal wall panels [and sub-girts] to withstand design wind pressures prescribed in the California Building Code Chapter 16 as modified by Division 01 Section "Lateral Force Procedures".
Design spans are shown on the Drawings. Additional structural supports that would reduce design span or panel gage shall be the responsibility of the Subcontractor.
Maximum deflection of wall panels in a direction normal to the plane of the panel, when subjected to maximum design pressure shall not exceed L/175.
Water Penetration: With sidelap sealant – no leakage at 6.24 psf per ASTM E 1646.
Air Infiltration: With sidelap sealant - <0.02 CFM/lineal ft. of panel seam at 1.57 psf positive pressure, and 0.06 CFM/lineal ft. of panel seam at 1.57 psf negative pressure per ASTM E1680.
Submit under provisions of Divisions 01 Section "General Requirements" and "Special Procedures."
Product Data: Manufacturer’s specifications, product data and installation instructions.
Shop Drawings: Shop and erection drawings for metal panels, trim, flashings, closures, sub-girts, fastenings, sealant and accessories. Show metal gages, dimensions and finishes. Indicate relationships and connections to adjacent materials.
Engineering Calculations: Engineering calculations substantiating compliance with structural requirements of Article 1.04A "Structural Requirements" shall be prepared, signed and wet-stamped by a Structural Engineer licensed in the State of California.
Samples: Full profile width X 12 inches (300 mm) long for approval of each metal panel color, finish and profile.
Warranty: Submit 3 copies of required warranties.
Manufacturer’s Qualifications: Minimum of ten (10) years of successful experience in fabricating metal systems in this type and size.
Erector’s Qualifications: Erector acceptable to panel manufacturer.
Regulatory Requirements: California Building Code (CBC), latest edition, Chapter 16 as modified by Division 01 Section "Lateral Force Procedures".
Delivery, Storage and Handling
Transport, handle, and store panels and trim in a manner to preclude damage or staining of any nature.
Remove panels and trim which are cracked, bent, chipped, scratched, stained or otherwise unsuitable for installation and replace with new.
Warrant organic metal finish for a period of twenty (20) years from date of installation against chipping, cracking, checking, peeling, blistering and color change within the limitations stated in panel manufacturer's standard warranty.
Subcontractor’s Warranty: Warrant panel system, including flashings, sealants, fasteners, and accessories against defective materials and/or workmanship, to remain watertight and weatherproof for 2 years following Notice of Substantial Completion in accordance with the requirements of Division 01 Section "General Requirements".
Profile: Insert the selected profile number and description. Include the following clause if appropriate. [or equal products of manufacturers listed in Article 2.01 Manufacturers.]
Profile: Centria Architectural Systems "Econolap 4.2 Exposed Fastener".
Profile: Established standard: IMSA Building Products, Inc., 2110 Enterprise Blvd., West Sacramento, CA, Prestige Series “PS (W)–12” 1-1/2" deep, uninsulated, tongue and groove side joints, concealed fastener type.
Base Metal: Cold rolled steel conforming to ASTM A653, Grade C, zinc-aluminum protective coating not less than 1.9 mils thickness and conforming to ASTM A792, gage complying with requirements of Article 1.04A "Structural Requirements" and approved engineering calculations submittal, but not less than 20 gage.
Trim, Closures and Flashings: Of same manufacture, material, gage and finish as wall panels.
Sub-Girts: [As shown on Drawings] [G90 zinc coated, formed steel, 16 gage minimum] [As shown on approved engineering calculations submittal] .
Fasteners: As per manufacturer's recommendations for conditions of use, stainless steel or hot dip galvanized. Fasteners shall be designed to be concealed where possible.
Sealants and Sealant Tapes: Non-sagging, non-bleeding type as per approved manufacturer's recommendations. Factory applied sidelap sealant is required. Field applied sidelap sealant is not permitted.
Profile Closures: Neoprene or polyethylene foam, die-cut or formed to panel configuration.
Building Paper: Waterproof, duplex paper conforming to Fed. Spec. UU-B-790, Type I, Grade B.
Select between the following two Par. A: (Field painting is prudent when quantities are small and manufacturer's standard colors do not meet color requirements.)
Outboard Metal Surfaces: Referenced manufacturer's polyvinylidene fluoride (Kynar 500 with minimum 70% resin) organic enamel finish consisting of thermosetting 0.8 mil polyvinylidene fluoride finish coat applied over 0.2 mil epoxy prime coat with total dry film coating thickness of not less than 1 mil.
Colors: [Color to match existing] [Special] [Single color] [ ___ colors] [to be selected by LBNL] [from manufacturer's standard colors] [from manufacturer's above-standard colors].
Outboard Metal Surfaces: Field painting over exterior side of metal panels is specified in Division 09 Section "Coatings".
Inboard Metal Surfaces: 0.35 mil polyester finish coat over 0.15 mil epoxy prime coat with total dry film coating thickness of not less than 0.5 mils.
Factory fabricate components ready for field assembly, in accordance with manufacturer's specifications and recommendations and reviewed shop drawings for the particular installations and conditions indicated.
Fabricate wall panels in single lengths, top to bottom, as per field measurements. Transverse joints are not permitted.
Fabricate trim and flashings in longest practical lengths.
CONDITION OF SURFACES
Prior to commencing work, examine surfaces and framing to receive wall panels and accessories and report in writing any conditions that would prevent the proper installation of the system. Starting work implies acceptance of surfaces as satisfactory.
Coordinate installation of wall panels and accessories with installation of work of other trades whose work adjoins with the work of this Section.
Apply building paper to metal framing prior to installing sub-girts. Lap 2 inches (50 mm) min. at edges and 6 inches (150 mm) at ends and fasten with self-tapping metal screws with neoprene washers.
Install wall panels, flashings, closures, trim and accessories as per Drawing requirements, reviewed shop drawings and manufacturer's specifications, instructions and recommendations, and so as to provide a watertight installation.
Erect components using manufacturer's own crews or approved and licensed erector.
Remove any strippable protective coating on the panels, trim and flashings prior to installation. In any case, do not allow strippable coating to remain in extreme heat, cold, or in direct sunlight or other UV source.
Install work true, square and plumb, field cuts, bending and fitting neatly and accurately done without damage to surfaces.
Fit adjacent panels together so that joints are uniform, tight and in full contact.
Unless shown or specified otherwise, conceal fasteners. Where exposed fasteners are required for formed metal trim, they shall be uniformly spaced and aligned. Heads of exposed fasteners shall match adjacent panel and trim faces.
Provide sealants as per manufacturer's directions and recommendations and so as to provide a watertight installation.
Protect dissimilar metals from galvanic corrosion.
Comply with requirements of Division 01 Section "Construction Waste Management."
Clean exposed surfaces free of dirt, dust and construction soil. Touch up abrasions in factory applied coatings. Where extent of damage will not permit inconspicuous touch-up and repair, remove damaged items from the site and replace with new.
Protect work until entire installation is fully completed.