08630 Metal Framed Skylights
GSI Glazed Structures Inc.
350 Center St.
Grayslake, IL 60031
847-223-4500
fax 847-223-6444
www.gsiskylights.com
Part 1: GENERAL
(1.1) SCOPE
A.
This section includes everything necessary for and incidental to the execution and
completion of skylight work as shown on drawings and specified herein.
B.
Work includes by is not limited to the following:
1.
C.
Design, fabrication and erection of skylight framing and glazing required making
a complete engineering drawings.
Work not included under this section of specifications:
1.
2.
3.
4.
5.
6.
7.
Structural steel framing
Supporting curbs
Grouting, wood blocking
Washing or polishing of glazing panels
Through wall flashing, counter flashing, reglets
Electrical work or hook up
Other (as required by Architect)
(1.2) QUALIFICATIONS:
A.
The skylight(s) shall be GSI Metal framed skylights as manufactured and installed by
GSI Glazed Structures International, 350 Center St, Grayslake, IL 60031, 847-223-4500,
having the geometry and the member shapes, sizes and wall thickness shown on the
architectural drawings and as hereafter described. Substitute manufactures shall not be
considered unless they have been approved in writing no later that ten (10) days prior to
bid date. Only those manufactures whose product is in strict conformity with this section
of the specifications and with the contract drawing details will be considered for approval
as substitute manufacturers. Requests for approval must be accompanied by complete
specifications along with photographs of at least (3) three successful skylighting
enclosures of equal size to that specified herein, and preliminary design proposal
drawings.
(1.3) LOADING REQUIREMENTS:
A.
Aluminum framing components shall be designed to support the following loads:
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1.
2.
3.
B.
Load Combinations:
1.
2.
3.
4.
C.
Live Load (downward) of __________
Wind Load (horizontal) of __________
Negative Pressure (normal to surface) of __________
Live + Dead
Wind + Dead
Negative Pressure – Dead
(Live + Wind + Dead)/1.33
Maximum allowable deflections. (Architect to specify)
(1.4) GUARANTEE
A.
The skylight(s) and all appurtenant items supplied under this section shall be guaranteed
for a period of five (5) years after acceptance of the building by the Owner against
leakage, defective design, defective materials and construction. This guarantee is
limited to replacement or repair of materials supplied and does not include consequential
damage.
Part 2: PRODUCTS
(2.1) MATERIALS
A.
Extruded Aluminum
All aluminum framing components shall be extruded and shall have minimum
mechanical properties equal to or greater than 6063-T6 alloy and temper (with the
exception of structural members to be curved). Structural framing members to be
curbed are to be furnished in an alloy best suited to fulfilling the curving function with the
minimum of deformation while maintaining structural integrity. All exterior caps shall
have a minimum effective thickness of .125” The actual alloy, temper and gauge used
however, shall be contingent upon the physical performance required to satisfy the
requirements of:
1.
2.
3.
4.
B.
Loading and deflection.
Cross sectional configuration.
Finish.
Processing procedures i,e,. forming, rolling etc.
Sheet aluminum
1.
2.
Painted finish: Minimum thickness .040: chemical composition to satisfy
requirements of finish and end use. All .040” thick aluminum used shall be
hemmed a minimum of 3.4: to improve rigidity and appearance of the sheet
metal.
Anodized finish: Minimum thickness .040: chemical composition to satisfy
requirements of finish and end use.
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C.
Finish
All aluminum components shall be mechanically processed for proper adhesion of paint.
All paint shall be thermo set electrostatic powder coat paint. Painting process shall be
done “in-house” to maintain quality control, warrantees, and sole responsibility of skylight
system. Color (Dupont, Morton standards, architect shall specify). Paint shall pass
Mandrel Bending Test ISO1519/ASTM D522 Results 5/32 in/4mm. Impact test 1/10 in.
Distortion ISO 6272/ STMD 2794-90 up to 40 in./lbs
D.
Sealant materials
1.
E.
Fasteners
1.
2.
F.
All fasteners used in the structure shall be stainless steel. All fasteners exposed
to view shall receive an color coating to match the finish on the adjacent
aluminum.
All stainless steel fasteners shall be in the AISI (American Iron and Steel
Institute) 300 or 400 finish series.
Glazing:
1.
G.
Sealant at all exposed and concealed metal joints and as otherwise designated
on the drawings shall be:
a.
One-part low modules silicone sealant with a minimum plus or minus 50
percent joint movement capability and conforming to FS TT-S-001543
b.
Narrow joint sealant shall conform to AAMA Standard 803.3-1972.
Specify
Gasketing for the skylight located above and below the glazing panels shall be
continuous neoprene with the following characteristics:
1.
2.
The material shall consist of at least 50% by weight of basic rubber hydrocarbon
and shall contain no crude or reclaimed rubber. It shall be homogenous and free
from defects.
Resistances to deterioration by sunlight, weathering and oxidation, and to
permanent deformation under load, are prime essentials.
(2.2) CONSTRUCTION
A.
The skylight(s) shall be of the geometry indicated on the contract drawings.
B.
Rafter, purling and clamping bars shall be extruded aluminum (sheet metal or formed
plate clamping bars shall not be accepted).
C.
Clamping bars (pressure caps) shall be attached to vertical rafters sections by means of
the continuous screw slot with #14 stainless steel tapping screws, since tolerances
during extruding do not always allow for positive interaction in the serration of systems
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08630 Metal Framed Skylights
fastened with machine screws. All clamping bars shall include and extruded aluminum
snap-on cover to conceal the tapping screws.
D.
E.
All welding shall be by the GMAW TMAW process.
Provide weep holes with open cell baffles to prevent blow back and transfer of
condensation to the exterior.
F.
Framing description
1.
Vertical and horizontal structural framing members shall be 2 1/4” wide x 3 ½” deep
extruded aluminum system to satisfy loading conditions.
The vertical and horizontal frames shall incorporate a integrated condensation and rain
gutter as an integral part of the extruded aluminum shape.
Horizontal purlings shall be two sided butt-joint sealed with structural silicone designed
for butt-joint applications.
2.
3.
Part 3: Execution
(3.1) Installation, General
A.
Qualifications
1.
Manufacture Qualifications: The skylight systems being specified shall be as
manufactured by GSI (Glazed Structures Inc) 350 Center St. Grayslake, IL
60030, USA. All approved manufactured shall be considered unless they have
been approved in writing no later that ten days prior to bid date. Only those
manufactures that have a minimum of ten (10) years of experience in design,
manufacturing and field installation of the specified glazing systems shall be
considered. Approved manufactures systems shall be in strict conformity with
this section of the specification and the contract drawing details. Manufactures
requesting approval must submit complete details, specification and structural
calculations prior to approval. This information is to be accompanied by a list of
no less that five (5) of the same type and preliminary design proposal drawings.
2.
Field construction and installation Qualifications: To maintain the Guarantee as
specified, installation of the structure and glazing system shall be completed by
the manufacture’s field construction personal. Manufacture construction division
shall have no less than ten (10) years of field installation experience with
systems as specified.
B.
Skylight manufacturer to examine all surfaces prior to the start of installation. All
deviations from the approved shop drawings are to be brought to the attention of the
general contractor at once. The general contractor shall make corrective measures.
C.
To prevent electrolysis, aluminum components that come into contact with dissimilar
materials shall be protected by a continuos layer of pvc or similar material.
(3.2) Installation Quality Control
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A.
All structural elements to which the skylight must attach shall maintain the following
tolerances (this is the responsibility of others-to be verified by the skylight contractor):
1.
B.
All plan dimensions shall be held to a +- ½” no-cumulative tolerance and all
elevations shall be held to a +- ¼” tolerance during construction to allow for
proper adaptation of the aluminum framing system.
Manufacture and installation of the aluminum framing system shall be done per the
approved design drawing and according to the minimum field dimensions present, and
shall be plumb, square and aligned within its self. Any minimum/maximum field variance
shall be taken up through a variable gap between perimeter members and the adjacent
structural framework and not through a misalignment of the aluminum framing system
END OF SECTION 08630
© 2002 GSI Glazed Structures Inc. All Rights Reserved.
A copyright license to reproduce this specification and computer disk is hereby granted to
non-manufacturing architects, specification writers, and designers.
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