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<br />CITY OF SOUTH BEND <br />STUDEBAKER NATIONAL MUSEUM <br />SKYLIGHT REPLACEMENT TRANSLUCENT SKYLIGHTS 08952-4 <br />e. Skylight-System Sealants: Compatible with components with which sealants come in <br />contact and recommended by skylight and sealant manufacturers for this use. <br /> <br />3. Fabrication, General: <br /> <br />a. Aluminum Components: As follows: <br />1) Fabricate components that, when assembled, will have accurately fitted joints with <br />ends coped, mitered, or butted to produce hairline joints free of burrs and <br />distortion. <br />2) Fabricate components to drain water passing joints and to drain condensation and <br />moisture occurring or migrating within assemblies to the exterior. <br />3) Fabricate components to accommodate expansion, contraction, and field <br />adjustment and to provide for minimum clearance and shimming at assembly <br />perimeter. <br />4) For shapes with sharp profiles, straight and free of defects of deformations, before <br />finishing. <br />5) Fit and assemble components to greatest extent practicable before finishing. <br />6) Reinforce members as required to retain fastener threads. <br />7) Where fasteners are exposed to view from interior, countersink fastener heads and <br />finish them to matching framing. <br />8) Before shipping, shop-assemble, mark, and disassemble components that cannot <br />be permanently shop assembled. <br /> <br />b. Fiberglass-Sandwich-Panel Fabrication: As Follows: <br />1) Laminate face sheets to grid core under a controlled heat-and-pressure process <br />with straight adhesive bonding lines that cover the width of core members and that <br />have sharp edges. <br />2) White spots indicating lack of bond at intersections of grid core members are <br />limited in number to 4 for every 40 sq.ft. of panel and limited in diameter to 3/64". <br />3) Fabricate with grid pattern that is symmetrical about centerlines of each panel. <br />4) Fabricate panel to allow condensation within the panel to escape. <br />5) Reinforce panel corners. <br /> <br />4. Translucent Roof Panels: <br /> <br />a. Grid Pattern: <br />1) 12" x 24" nominal shoji <br /> <br />b. U-Value per ASTM C236: <br />1) No greater than 0.30 Btu/sq.ft. x h x deg F. <br /> <br />c. Interior Face Color: <br />1) Clear “Crystal” <br /> <br />d. Exterior Face Color: <br />1) Clear “Crystal” <br /> <br />5. Components and Accessories: <br /> <br />a. Panel Grid: Fabricate the panel grid core from extruded 6063-T6 aluminum I-beams. <br />Mechanically interlock the muntin and mullion I-beam grid to prevent variations in <br />alignment at intersections and to minimize bond skips. <br /> <br />b. Translucent Facing: Fabricate panels using fiberglass face sheet metal manufactured <br />with uniform color which is free of ridges, wrinkles, clusters of air bubbles and pinholes