1.0 GENERAL SKYLIGHT
1.1 Submittals
A. Shop Drawings: Indicate material types, gauges and finishes, fabrication details and installation details. Show glazing types, methods of attachment and thermal movement provisions.
B. Product data: Indicate materials, finishes and installation procedures recommended by manufacturer. Indicate compliance with specified design criteria. Include specific glazing details.
C. Structural design calculations: Indicate compliance with specified structural design criteria. Submitted design calculations shall bear seal of a professional engineer responsible for their preparation. Indicate that engineer has reviewed shop drawings.
D. Samples: Submit samples of aluminum materials. Samples shall be minimum 6″ by 6″ or 6″ in length and shall indicate full range of color to be expected in finished work.
E. Test data: Indicate compliance with performance requirements specified herein.
F. Maintenance data: Submit as part of Contract closeout documents. Include instructions for general maintenance and repair of surfaces and finishes. Include detailed re-glazing procedures.
G. Record drawings: Submit as part of Contract closeout documents. Indicate changes made during construction.
1.2 Quality Assurance
1. Manufacturer: Skylight manufacturer shall have a minimum of ten years experience in design, fabrication and installation of custom aluminum skylight systems.
2. Pre-installation meeting: Prior to beginning skylight installation, a pre-installation meeting shall be held to review work to be accomplished.
A. Contractor, Architect, skylight manufacturer, erection and glazing subcontractor and other trades with work related to skylight installation shall be present.
B. Agenda shall include review of roofing manufacturer’s requirements for protection of roof and flashing systems during skylight installation.
1.3 Delivery, Storage and Handling
A. Deliver and store components in manufacturer’s protective packaging. Store in a dry space, off floor.
B. Handle materials to prevent damage to pre-finished surfaces. Do not install components, which have been damaged or stained.
1.4 Project/Site Conditions
A. Field dimensions: Take field dimensions before preparation of shop drawings and fabrication.
B. Protection: Protect aluminum surfaces from contact with lime, mortar, cement, acids and other harmful surfaces as well as from careless handling, storage or machining.
1.5 Warranties
A. Provide Owner’s ** (5) (10) ** year written warranty covering skylight work. Warranty shall cover defective materials, workmanship and performance and shall provide for the prompt repair of leaks at no additional cost to Owner. Warranty shall be limited to repair or replacement of work described in this section and shall not provide for repair or replacement of work by others. RETAIN BELOW FOR FLUOROPOLYMER FINISH
B. Finish warranty: Provide written warranty agreeing to repair of replace fluoropolymer coating which exhibits checking, crazing, peeling, chalking or fading. Ten year warranty is standard. Extended warranty available.
C. Warranties shall begin on Date of Substantial Completion.
2.0 PRODUCTS
2.1 Metal Framed Skylights
A. Acceptable product: Series **300**500**700** as manufactured by Gammans Skylight Systems, 10 Beavers Street, Newnan, Georgia 30263. Phone (770-254- 1992), Fax (770-251-7094).
B. Aluminum components:
1. Extrusions: Meeting ASTM B221; alloy, temper and wall thickness as required to meet design criteria. Structural characteristics of aluminum shall be in accord with AA, “Specification for Aluminum Structures.”
2. Sheet: 5005-H34 alloy meeting ASTM B209; minimum 0.040″ thickness.
C. Finish: Provide one of the following:
1. Anodized coating:
a. Color: Standard color as selected by Architect.
b. Unexposed aluminum components: Mill finish.
**OR**
1. High performance paint:
a. Exposed **exterior** aluminum components and components to which exterior sealant is applied:
1) Two-coat, shop-applied,70% resin, baked-on fluoropolymer coating system based on Elf Atochem, Kynar 500 or Ausimont U.S.A., Inc. Hylar 5000 resin (polyvinylidene fluoride, PVDF), formulated by a licensed manufacturer and applied by manufacturer’s approved applicator to meet AAMA 2605-98.
2) Color: (Standard) (Custom) color as selected by Architect.
b. Unexposed aluminum components: Mill finish.
D. Glazing material and accessories:
1. Standard Certification Requirements:
a. Heat treated glass: ASTM C1048, with surface stress of 5,000 +/- 1500 psi.
b. Laminated glass: Two lites interleaved with polyvinyl butyral (PVB). Provide PVB layer of minimum 0.030-in.
c. Insulating glass: CBA rated by IGCC when tested in accordance with ASTM E773 and ASTM E774. Dual edge seals shall have secondary silicone seal. Exterior lite shall be (heat strengthened) (fully tempered) glass and interior lite shall be laminated glass.
2. Glazing Unit Composition
a. Inboard lite: **Clear**color, laminated float glass, formed from two sheets of heat strengthened glass laminated with PVB layer; **_______ “thickness.**
b. Outboard lite:_________________ heat-strengthened glass; ** ________” thickness.**
3. Unit thickness: **1″.**1-1/8″.**1-1/4″.**
4. Spacer: Manufacturer’s standard steel or aluminum spacer welded, soldered, fused, bent or butyl-injected corners and welded, soldered, fused or butyl-injected splices and joints, filled with desiccant; to provide a 1⁄2″ thickness, hermetically sealed, dehydrated air space. Primary seal shall be polyisobutylene and secondary seal shall be two-part silicone.
E. Glazing sealant for structural glazing and exterior weather seal:
1. Acceptable products: a. Dow Corning Corp.#795 Silicone Building Sealant. b. GE Silicone Construction Products, Ultraglaze SSG4000. c. Tremco, Inc., Spectrem II.
2. Characteristics: One-part silicone rubber; black color.
3. Provide primers as required by adhesion testing, backer rod and accessories acceptable to sealant manufacturer.
**OR**
E. Glazing gaskets: Glazing assembly manufacturer’s standard extruded or molded neoprene or Ethylene Propylene Diene Monomer (EPDM) gaskets.
F. Perimeter sealant: As specified in Sealants and Caulking section.
G. Non-skinning sealant: Non-skinning butyl type, meeting AAMA “Joint Sealants” manual.
H. Fasteners and anchors: Corrosion resistant.
I. Bituminous coating: Cold-applied, asphalt mastic meeting SSPC-Paint 12, minimum 30 mil thickness.
J. Neoprene pads: Neoprene, 60-70 durometer hardness, meeting ASTM D1056.
2.2 Fabrication
A. Factory fabricate skylights. Work which cannot be factory-assembled shall be factory fabricated, checked for fit, marked and disassembled to extent required for shipping.
1. Fabricate components to sizes indicated on approved shop drawings without distortion in finished surfaces.
2. Form returns with sharp arises.
3. Attach components with concealed fasteners and without exposed sealant joints, unless otherwise indicated on drawings.
B. Make riveted joints in sheet metal flashing work using solid shank rivets or closed end type pop rivets.
C. Welding shall be by heliarc process in accord with AWS standards, with welds ground smooth prior to finishing.
D. Weep curbs to exterior. Provide weeps at each rafter intersection, minimum, for infiltration and condensation.
3.0 EXECUTION
3.1 Installer
A. Manufacturer of skylight system or skylight manufacturer’s approved installer shall install skylight system.
3.2 Preparation
A. Inserts and anchorage: Furnish inserts and anchoring devices which must be preset in concrete on timely basis to avoid delay in the work. Furnish location drawings for use in installation of inserts and anchorages.
B. Coordinate setting drawings, diagrams, templates and instructions for installation of concrete inserts, anchor bolts and miscellaneous items having integral anchors cast in concrete construction.
3.3 Installation
A. Verify location and alignment of preset anchors. Report deviations and proposed method for correction to Architect prior to proceeding.
B. Fastening to in-place construction: Provide anchorage devices and fasteners for securing skylights to in place construction, including threaded fasteners for concrete inserts, anchor bolts and erection bolts of types and sizes indicated on approved shop drawings.
C. Cutting, fitting and placement: Perform cutting, drilling and fitting for installation of work. Set work in location, alignment and elevation, plumb and level, true and free of rack; measured from established lines and levels. Install work in accord with approved shop drawings.
D. Protect aluminum from contact with dissimilar materials by separating with neoprene pads or bituminous coating.
E. Before securing skylight components in final position to structure, shim and brace work plumb and level and in designated location.
F. Field connections: Provide welded or bolted connections as indicated on approved shop drawings. Join dissimilar metal by bolting with galvanic separators. Welding shall be performed by qualified welders.
G. Welded connections: Conduct in accord with AWS standards for type of metal being welded. Clean surfaces to be welded as specified in shop cleaning. Do not weld finished, exposed members. Do not perform welding at locations where discoloration or other damage would result on exposed surfaces.
H. Bolted connections: Provide for alignment of skylight members with substrate.
I. Caulk metal-to-metal internal skylight joints using non-skinning type sealant. Install in accord with Joint Sealants section.
J. Caulk perimeter of skylights and exposed fastener heads using exterior sealant as specified in Joint Sealants section. Do not seal weep holes.
K. Glaze units in accord with approved shop drawings and manufacturer’s product data for weather tight and watertight installation.
L. Flashings:
1. Exposed to view in the finished work: Provide continuous cleat anchorage.
2. Concealed from view in the finished work: Provide fasteners at maximum 2′- 0″ o.c. Make weather tight fit, allowing for expansion and contraction.
3. Provide 6″ wide backup plate at joints, formed to profile of flashing. Set flashing over backup plate in double beads of non- skinning sealant.
4. Form joints in flashings to allow for 1⁄2″ minimum expansion at 20′-0″ o.c., maximum, and 8′-0″from corners.
M. Cleaning: Maintain skylight assemblies, including glazing, in reasonably clean condition during construction period. Immediately remove stains or materials having adverse effect on materials and finishes. Remove excess glazing sealants.
N. Allowable erection tolerances:
1. Maximum variation from designated position: 1/8″ in 10′-0″, not exceeding ?” in 40′-0″ any direction.
2. Maximum offset in alignment between two consecutive members in line, end to end:1/16″.
3. Maximum offset between framing members at corners of glazing pocket:1/32″.
3.4 Field Quality Control
A. Field tests: Conduct field testing of completed skylight assemblies to determine watertightness. Conduct testing in accord with AAMA 501.2 A minimum of (one test) (two tests) per skylight shall be performed. Correct deficiencies found in skylights to make assembly watertight. Conduct testing in presence of Architect.
3.5 Cleaning
A. Final cleaning: Just prior to Date of Substantial Completion, clean entire skylight assemblies, including interior and exterior metal. Clean using pre-tested detergent and water. Flush with clean water. Repair or replace work which cannot be cleaned or which has been damaged during construction operations.
3.6 Protection
Protect skylight system during remainder of work from damage caused by work of other trades.