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.
D. Samples:
Submit samples of aluminum materials.
Samples shall indicate full range of color to be expected in finished
work.
E. Test data:
Indicate compliance with performance requirements specified herein.
F. Closeout
Documents: Submit as fabricated drawings and specified warranty. Include instructions for general maintenance
and repair of surfaces and finishes.
1.2 Quality Assurance:
A. Manufacturer:
Skylight manufacturer shall have a minimum of ten years experience in design,
fabrication and installation of custom aluminum skylight systems.
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. Install no 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. 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. Warranty of finish as specified by
applicator. Glass warranty as specified by glass manufacturer.
B.
Warranties shall begin on Date of Substantial Completion.
2.0 PRODUCTS
2.1 Metal Framed Skylights
A.
Acceptable product: Series ** 350, 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:
1.
Aluminum components and components to which exterior sealant is applied:
a. **Two-coat, three coat**, shop-applied, 70% resin, baked-on fluoropolymer coating system based on Atofina, Kynar 500 or Ausimont U.S.A., Inc. Hylar 5000 resin.
b. Color:
**Standard, Custom** color as selected by Architect.
2. Unexposed aluminum components: mill finish.
D. Glazing
material and accessories: Heat strengthening and thickness as required to meet
loading conditions.
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.**
**OR**
2. Glazing Unit Composition:
a.
Laminated unit composed of two lites
**__** thick with **.030, .060** interlayer.
3. Spacer of insulated units: 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 ½” thickness, hermetically sealed, dehydrated air space. Primary seal shall be polyisobutylene and secondary seal shall be two-part silicone.
E. Glazing
gaskets: Glazing assembly manufacturer’s standard extruded or molded neoprene
or Ethylene Propylene Diene Monomer (EPDM) gaskets. Glazing tapes as manufactured by Norton, Inc. or equal.
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.
Exposed fasteners to be stainless steel. Concealed/protected fasteners to be zinc coated. Anchors to be zinc coated.
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 to dimensions and specifications called out on approved
shop drawings. Aluminum to be used for
reinforcment to greatest extent possible.
Any steel reinforcement or clipwork shall be finished with a high zinc
finish such as a zinc cromate primer.
B. Make
riveted joints in sheet metal flashing work using stainless steel 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. Weep holes shall be baffled to prevent noise
or whistling from wind.
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 weepholes.
K. Glaze
units in accord with approved shop drawings and manufacturer’s product data for
weather-tight installation.
L.
Flashings: Make weather-tight fit, allowing for expansion and contraction.
Provide 6” wide backup plate at joints, formed to profile of flashing. Set
flashing over backup plate in double beads of non-skinning sealant. Form joints
in flashings to allow for ½” minimum
expansion 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 ¼” 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
water-tightness. 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. Flush with clean water.
Repair or replace work which cannot be
cleaned or which has been damaged during construction operations.
3.6
PROTECTION:
A. Protect
skylight system during remainder of work from damage caused by work of other
trades.
GAMMANS
SKYLIGHT SYSTEMS
10 BEAVERS
STREET
NEWNAN,
GA. 30263
770-254-1992
770-251-7094
(FAX)