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| METAL-FRAMED SKYLIGHTS
- Guide Specification |
| Section 08625 - 08630
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| PART 1 GENERAL |
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Click
here to open Specifications in MSword format (skylight-spec.doc)
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1.01
SECTION INCLUDES
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A. Design, engineering, drafting of production
documents, structural calculations,
fabrication and erection of the entire
skylight system.
B. Skylight glass and glazing.
C. Skylight related flashings.
D.
Applied finish of aluminum extrusions and related
flashings
E. Curbs, by others, capable
of resisting all loading imposed upon it by
the skylight
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1.02
RELATED SECTIONS
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A. Section 05120:
Structural Steel.
B. Section 05160:
Space Frames.
C. Section 05500:
Metal Fabrications.
D. Section 07600:
Flashing and Sheet Metal.
E. Section 08800:
Glazing.
F. Section 08900:
Glazed Curtain Walls.
G. Section (____):
Roofing.
H. Section (____):
Sealants.
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1.03
REFERENCES
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A. Aluminum Association
Incorporated (AA):SAS-30 Specifications for
Aluminum Structures.
B. American Architectural
Manufacturers Association (AAMA):
1. 501.1: Standard
Test Method for Metal Curtain Walls for Water
Penetration Using Dynamic Pressure.
2. 501.2: Field
Check of Metal Curtain Walls for Water Leakage.
3. 501.3: Field
Check of Water Penetration Through Installed
Exterior Windows, Curtain Walls and Doors
by Uniform Air Pressure Difference.
4. 603.8: Performance
Requirements and Test Procedures for Pigmented
Organic Coatings on Extruded Aluminum.
5. 605.2: Specification
for High Performance Organic Coatings on Architectural
Extrusions and Panels.
6. 606.1: Voluntary
Guide Specification and Inspection Methods
for Integral Color Anodic Finishes for Architectural
Aluminum.
7. 607.1: Voluntary
Guide Specification and Inspection Methods
for Clear Anodic Finishes for Architectural
Aluminum.
C. American National
Standards Institute (ANSI): Z 97.1 -1984- Safety
Glazing Materials Used in Buildings -Safety
Performance Specifications and Methods of Test.
D. American Society
for Testing and Materials (ASTM):
1. A193: Standard
Specification for Alloy-Steel and Stainless
Steel Bolting Materials for High Temperature
Service.
2. A307: Specification
for Carbon Steel Bolts and Studs, 60,000 psi
Tensile Strength.
3. B209: Specification
for Aluminum and Aluminum-Alloy Sheet and
Plate.
4. B211: Specification
for Aluminum-Alloy Bar, Rod and Wire.
5. B221: Specification
for Aluminum and Aluminum-Alloy Extruded Bars,
Rods, Wire, Shapes and Tubes.
6. B316: Specification
for Aluminum and Aluminum-Alloy Rivet and
Cold-Heading Wire and Rods.
7. C719: Standard
Test Method for Adhesion and Cohesion of Elastomeric
Joint Sealants Under Cycle Movement.
8. C794: Test
Method for Adhesion-In-Peel of Elastomeric
Joint Sealants.
9. C1036: Specification
for Flat Glass.
10. C1048: Specification
for Heat-Treated Flat Glass-Kind HS, Kind
FT Coated and Uncoated Glass.
11. D395: Test
Methods for Rubber Property -Compression Set.
12. D412: Test
Methods for Rubber Properties in Tension.
13. D1171: Test
Method for Rubber Deterioration -Surface Ozone
Cracking Outdoors or Chamber (Triangular Specimens).
14. D2240: Test
Method for Rubber Property -Durometer Hardness.
15. E283: Test
Method for Rate of Air Leakage Through Exterior
Windows, Curtain Walls, and Doors.
16. E330: Test
Method for Structural Performance of Exterior
Windows, Curtain Walls and Doors by Uniform
Static Air Pressure Difference.
17. E331: Standard
Test Method for Water Penetration of Exterior
Windows, Curtain Walls and Doors by Uniform
Static Air Pressure Difference.
18. E773: Test
Method for Seal Durability of Sealed Insulating
Glass Units.
19. E774: Specification
for Sealed Insulating Glass Units.
20. E783: Method
for Field Measurement of Air Leakage Through
Installed Exterior Windows and Doors.
E. Consumer Product
Safety Commission (CPSC): 16CFR 1202 - Architectural
Glazing Standards and Related Material.
F. Flat Glass Manufacturers
Association (FGMA): Glazing Manual.
G. Insulating Glass
Certification Council (IGCC): Classification
of Insulating Glass Units.
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1.04
SYSTEM DESCRIPTION
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A. Design Requirements:
1. Extruded aluminum members with a system
of alternate serrations for attachment of
exterior glass retainers with 1/4-in. x 20
stainless steel screws and snap-on beauty
caps.
2. Condensation guttering system integral
with skylight framing members for positive
drainage of condensation.
3. Flush glazed exterior horizontal joints
with field applied structural silicone.
4. Full silicone wet seals along both sides
of all exterior glass retainers.
5. Optional aluminum gutters, with insulation
and pitched liners, when applicable.
6. Pressure Bars shall allow removal and
replacement without destruction or loss of
integrity. Snap-in systems are not acceptable.
B. Performance
Requirements:
1. Structural Members: Of sufficient sizes
to support design loads as prescribed by governing
building codes.
2. The deflection of the framing member in
a direction normal to the plane of glass when
subjected to a uniform load deflection test
in accordance with ASTM E330, and per the
above specified loads, shall not exceed L/175,
up to 1-in. maximum, for clear spans under
20-ft., or L/240 for clear spans greater than
20-ft.
3. The deflection of a framing member in
a direction parallel to the plane of glass,
when carrying its full dead load, shall not
exceed an amount which will reduce the glass
or panel bite below 75% of the design dimension
and the member shall have a 1/8-in. minimum
clearance between itself and the edge of the
fixed panel, glass, or component immediately
adjacent, nor shall it impair the function
of or damage any joint seals.
4. Water Penetration: No water penetration
shall occur when the system is tested in accordance
with ASTM E331 using a differential static
pressure of (20% of the inward acting design
wind load pressure, but not less than (12
psf). Water penetration is defined as the
appearance of uncontrolled water other than
condensation on the interior surface of any
part of the skylight.
a. Drain water penetrating at joints, as
well as condensation occurring within the
system to exterior face of the work.
5. Thermal Movement: Provide for such expansion
and contraction of component materials as
will be caused by a surface temperature range
of +/- (___) degrees F. ranging from (___)
to (___) degrees F. without causing buckling,
stress on glass, failure of seals, undue stress
on structural elements, reduction of performance
or other detrimental effects.
6. Compression flanges of flexural members
may be assumed to receive effective lateral
bracing only from anchors to the building
structure and horizontal glazing bars or interior
trim which are in contact with 50% of the
member's total depth.
7. Where permitted
by code, a 1/3 increase in allowable stress
for wind or seismic load shall be acceptable,
but not in combination with any reduction
applied to combined loads. In no case shall
allowable values exceed the yield stress.
8. The skylight framing is designed to be
self-supporting between the support construction.
The skylights will impose reactions to the
support construction. All adjacent and support
construction must support the transfer of
all loads including horizontal and vertical,
exerted by the skylights. Design or structural
engineering services for the supporting structure
or building components not included in the
skylight scope are not included under this
section.
9. The skylight framing is to be designed
to exert no horizontal reactions under vertical
gravity type loads, (dead, snow, live). Unbalanced
live loads, (wind, seismic, etc.), acting
upon the skylight will produce horizontal
reactions that cannot be controlled by the
skylights, but must be resisted by the support
structure
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1.05
SUBMITTALS
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A. Submit one set
of re-producibles and (____) copies of shop
drawings showing plans, elevations and sections
as required to fully describe the skylight construction
for the Architect's approval prior to starting
fabrication.
B. Submit structural
calculations prepared in accordance with the
Aluminum Association's Specifications for Aluminum
Structures (SAS30) by a (civil)(____) engineer
qualified in the design of self-supporting sloped
glazed systems licensed in (state where skylight
is to be installed)(____).
C. With regard
to structural silicone joinery, submit, only
if specifically requested:
1. Certification
that adhesion of sealant to samples of metal
and glass is adequate when tested in accordance
with ASTM C794.
2. Certification
that materials in contact with sealant are
compatible with sealant after being exposed
to 2,000-4,000 micro watt ultra-violet radiation
for 21 days.
3. Statement
that stress on each detailed sealant joint
will not exceed design stress of sealant when
exposed to specified wind loads.
D. Submit (____)
12-in. x 12-in. samples of each type of glass.
E. Submit (____)
manufacturer's samples of each type of sealant.
F. Submit (____)
6-in. long samples of extrusions (with appropriate
finish).
G. Submit (____)
sets of as-built drawings and cleaning and maintenance
manuals upon
completion of skylight installation.
H. Certification
that insulating glass units will withstand specified
design loads.
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1.06
QUALITY ASSURANCE.
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A.. The Skylight
manufacturer shall be regularly engaged in the
work of this Section, including design, engineering,
fabrication, finishing, preparation at the job
site, erection and glazing of the skylight system.
It shall be the responsibility of the skylight
manufacturer to demonstrate that he has performed
successfully on comparably sized projects and
of comparable design complexity over at least
the previous ten years.
B. inter-sky has
years of experience in the design, engineering,
manufacturing and installation of skylights.
Our skylight systems have been subjected to
rigorous testing during the course of development
and have been applied in hundreds of practical
applications.
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1.07 WARRANTY
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A. Submit manufacturer's
warranty certifying that skylight work was furnished
and installed in accordance with the Contract
Documents.
B. Certify that
skylight frame is free of defects in design,
material, and construction for a period of ten
(10) years from the Date of Skylight Completion.
C. Warrant glass
against defective materials, delamination, seal
failure, and defects in manufacture per the
glass manufacturer's standard warranties. Glass
breakage is not warranted.
D. Warrant structural
sealant for a period of ten (10) years per sealant
manufacturer's standard warranty of merchantable
quality. Warranty shall certify that cured sealant:
1. Will not become
brittle or crack due to weathering or normal
expansion and contraction of adjacent surfaces.
2. Will not harden
beyond a Shore A durometer of 50, nor soften
below a minimum of 10 points.
3. Will not change
color significantly when used with compatible
back-up materials.
4. Will not bleed
significantly.
E. Warranty service
becomes effective only following payment in
full for the contract amount.
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PART 2 PRODUCTS
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2.01 MANUFACTURERS
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A. Basis of design:
Contract documents
are based on products manufactured by
inter-sky skylights
(800)
972-9112. (714) 972-9112.
1. Optional manufacturers must pre-qualify
to bid not less than ten (10) days prior to
the bid closing date.
2. Complete details are submitted for review
by the Architect prior to bid.
3. Structural calculations, showing sizes
of framing members and loads applied to the
support structure, based on the design loads
of this specification are submitted for review.
4. Prospective manufacturers submit notarized
certification that they have successfully
performed in the phases of design, manufacture
and installation of skylight projects comparable
in nature over at least the previous ten (10)
years.
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2.02
MATERIALS
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A. Framework:
1. Principal
Supporting Members: .125-in. minimum thickness
extruded aluminum, alloy 6063-T5, 6063-T6,
or 6061-T6 per ASTM B221. Sizes, shapes and
profiles (as per inter-sky standard components)
(as indicated on the Contract Drawings).
2. Snap-on Covers
and Miscellaneous Non-supporting Trim: .062-in.
minimum thickness extruded aluminum, alloy
6063-T5 per ASTM B221.
3. Supporting
aluminum gutters: thickness as prescribed
by skylight engineer, based on skylight reactions
and applied design loads.
4. Principal
Formed Metal Members: .125-in. minimum thickness
aluminum, alloy (5052)(6061-T6) per ASTM B209.
B. Glazing Strips:
1. Extruded EDPM
rubber designed to comply with the following
specifications:
a. Hardness:
ASTM D2240 Type A. 50 (+/-5) durometer.
b. Tensile
Strength: ASTM D412. 800 psi (min.).
c. Elongation:
300% (min.).
d. Color: Black.
2. Compression
Set: ASTM D395 Method B, 22 hours @ 212 degrees
F: 25% (max.).
3. Heat Aging
Characteristics:
a. 70 hours
@ 212 degrees F.
b. ASTM D2240
Hardness Change: +5 durometer.
c. ASTM D412
Tensile Change: -10%.
d. ASTM D412
Elongation Change: -20%.
4. ASTM D1171
Weather Resistance at 1 Part Ozone per Million,
500 hours at 20% Elongation: No cracks.
5. No visual
checks, cracks or breaks after completion
of tests.
3. Heat Aging
Characteristics:
a. 70 hours
@ 212 degrees F.
b. ASTM D2240
Hardness Change: +5 durometer.
c. ASTM D412
Tensile Change: -10%.
d. ASTM D412
Elongation Change: -20%.
4. ASTM D1171
Weather Resistance at 1 Part Ozone per Million,
500 hours at 20% Elongation: No cracks.
5. No visual
checks, cracks or breaks after completion
of tests.
C. Setting Blocks:
1. Extruded Type
II silicone rubber designed to permit adhesion
and comply with the following specifications:
a. Hardness:
ASTM D2240 Type A 80 (+/-5) durometer.
b. Color: Black.
D. Fasteners:
1. For Exterior
Cap Retainers: ASTM A193 B8 300 series stainless
steel screws.
2. For Framework
Connections: ASTM B211 2024-T4 aluminum, ASTM
A193 B8 300 series stainless steel, and ASTM
B316 aluminum rivets, as required by connection.
3. For Anchoring
Skylight to Support Structure: ASTM A307 zinc
plated steel fasteners.
E. Flashing:
1. (5005 H34
Aluminum)(Copper)(Stainless Steel), (20 gauge)(____)
minimum thickness.
2. Sheet metal
flashings/closures/claddings are to be furnished
shop formed to profile in min. 10-ft. lengths.
When lengths exceed 10-ft., field trimming
of the flashing and field forming the ends
is necessary to suit as-built conditions.
Sheet metal ends are to overlap 6-in. to 8-in.
minimum, set in a full bed of sealant and
riveted if required.
F. Finish (Standard)(Custom)(____)
color coat to following requirements:
The
following is a listing of all types of finishes
that can be specified, therefore, only those finishes
that apply should be used in an individual specification
1 High Performance
Pigmented Organic Coatings: AAMA 605.2 (e.g.:
Duranar, Fluropon; min. 70% Kynar fluropolymers).
2. Pigmented
Organic Coatings: AAMA 603.8 (e.g.: Acroflur;
min. 50% Kynar fluropolymers).
3. Anodized Coatings:
a. AAMA 607.1
Architectural Class I clear anodized Type
AA-M10C22 A41: 215-R1.
b. Class II
clear anodized Type AA-M10C22 A-31: 204-R1.
c. AAMA 606.1
Architectural Class I pigmented anodized
Type AA-M10C22 A42:Light, medium and dark
bronze and black.
G.
Glass:
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). Units must meet criteria
of ANSI Z97.1- 1984 and CPSC 16 CFR 1201
for safety glazing. Provide PVB layer of
0.030-in. for all glass units unless a coating,
and/or frit is applied to the inside face
of the laminate thereby necessitating a
0.060-in. PVB layer.
c. Insulating
Glass: CBA rated by the Insulating Glass
Certification Council (IGCC) when tested
in accordance with ASTM E773 and ASTM E774.
Dual edge seals with the secondary seal
being silicone. Exterior lite of (heat strengthened)
(fully tempered) glass and interior lite
of laminated glass.
2. Performance
Requirements:
a. Probability
of breakage not to exceed 8/1000 for vertical
glass and 1/1000 for sloped glass upon first
application of design wind and live load
pressures. For glass selection, design wind
pressure for a one minute duration. For
loads of longer duration use standard engineering
practices for glass selection.
b. Probability
of breakage due to anticipated thermal stress
not to exceed 8/1000 for vertical glass
and 1/1000 for sloped glass.
3. Glazing Unit
Composition:
a. Sloped glass
units are to be (____).
b. Vertical
glass units are to be (____).
Specifier should
consult Glass and Glazing Specification, Section
08800, for glass make-up, sizes and compositions.
Composition breakdown goes here.
Specifier
to designate surface of color coat.
H.
Sealants:
1 Structural
Flush Glazed Joints: High performance silicone
sealant applied in accordance with manufacturer's
recommendations.
2. Non-structural
Flush Glazed Joints and Weather Seal Joints:
Silicone sealants applied in accordance with
manufacturer's recommendations.
3. Structural
silicone sealant performance requirements:
a. Hardness:
ASTM D2240 Type A, 30 durometer.
b. Ultimate
Tensile Strength: ASTM D412, 170 psi.
c. Tensile
at 150% Elongation: ASTM D412, 80 psi.
d. Joint Movement
Capability after 14 Day Cure: ASTM C719,
+/- 50%.
e. Peel Strength
(aluminum, glass, concrete) after 21 Day
Cure: ASTM C794, 50 ppi.
4. Structural
silicone shall not be used to support dead
weight of vertical glass or panels.
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2.03 FABRICATION
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A. Construct skylight(s)
using extruded aluminum members.
B. Construct skylight(s)
using a continuous aluminum curb with expansion
joints as required.
C. Insofar as practicable,
fit and assemble work in the manufacturer's
shop. Work which cannot be permanently assembled
shall be shop-assembled, marked, and disassembled
before shipment to the jobsite.
D. Design rafter
bars for slide-in type spline glazing strips.
E. Design glass
retainer fasteners to resist uplift loadings.
Spacing to be determined by structural calculations,
when applicable.
F. Use snap-on
beauty caps to conceal glass retainers and glass
retainer fasteners.
G. Shop locate
drill and bolt, or weld aluminum clips to framing
members.
H. Set glass with
interior and exterior EDPM glazing strips.
I. Use silicone
setting blocks to support glass and to provide
edge clearances and glass bites as outlined
below, in accordance with FGMA recommendations:
1. Set blocks not
less than 6-in. from edge of glass for support
unit.
2. Glass Bite:
Not less than 1/2-in. nor more than 5/8-in.
on any side of glass unit.
3. Maintain 1/4-in.
edge clearance between glass and adjacent
metal framework.
4. Use rubber
spacers to maintain separation of glass and
adjacent metal framework.
J. Locate weepholes
in curb to positively drain condensation to
exterior of skylight at each rafter connection.
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PART 3 EXECUTION
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3.01 EXAMINATION
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A. Upon arrival
to the jobsite for installation of the specified
work, the manufacturer’s erector is to examine
the structure and substrate to determine that
they are properly prepared, dimensionally accurate,
and ready to receive the skylight work included
herein. Report any discrepancies to the General
Contractor. Correction of faulty work to be
at the expense of the responsible party/s. The
skylight manufacturer is not responsible for
faulty structure or substrate.
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3.02 PREPARATION
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A. Contact between
aluminum and dissimilar metals shall receive
a protective coating of asphaltic paint for
the prevention of electrolytic action and corrosion.
B. Skylight manufacturer
and manufacturer’s erector excludes all field
measuring, demolition, removal, replacement,
or re-work of any existing material.
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3.03 INSTALLATION
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A. Install skylight
frame, glass and accessory items as needed in
accordance with manufacturer's instructions.
B. Install skylight
system under the direction of the skylight manufacturer's
designated erector.
C. Erect system
plumb and true, in proper alignment and relation
to established lines and grades as shown on
approved shop drawings.
D. Anchor skylight
to structure in strict accordance with approved
shop drawings.
E. Use high performance
silicone sealants to seal horizontal joints
between glass panels and silicone sealant to
wet seal joints between snap-on cap retainers
and glass.
F. Apply sealing
materials in strict accordance with sealant
manufacturer's instructions. Before application,
remove mortar dirt, dust, moisture and other
foreign matter from surfaces it will contact.
Mask adjoining surfaces to maintain a clean
and neat appearance. Tool sealing compounds
to fill the joint and provide a smooth finish.
G. Furnishing of
temporary covering and weather-proofing of the
skylight openings, if required by the General
Contractor, and removal of the protective measures
during and after the skylight installation is
excluded by the manufacturer and the manufacturer’s
erector. ANY TEMPORARY COVERINGS THAT MAY BE
REQUIRED ARE NOT TO OBSTRUCT OR INTERFERE WITH
THE SKYLIGHT INSTALLATION IN ANYWAY.
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3.04 TOLERANCES
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A. All parts of the work, when
completed, shall be within the following tolerances:
1. Maximum variation from plane
or location shown on approved shop drawings:
1/8-in. per 12-ft. length, or 1/2-in. in total
length.
2. Maximum offset from true
alignment between two members abutting end-to-end,
edge-to-edge in line or separated by less than
3-in.:1/32-in.
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3.05 FIELD QUALITY CONTROL
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A. Water Leakage:
Field check in accordance with AAMA 501.2 in
proportionate areas. There shall be no uncontrolled
water leakage as defined in AAMA 501.2. Water
supply to the skylights, with adequate water
pressure, is to be furnished by the General
Contractor. Tests are to be conducted upon completion
of the installation with no remobilization or
down time included to accommodate either water
supply availability or witness personnel schedules.
Testing is to be performed by the manufacturer’s
authorized personnel. Independent laboratory
testing and reports, if required, are to be
ordered and directed by the Owner and/or General
Contractor.
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| 3.06
CLEANING |
A. Install skylight
frame and associated metal to avoid soiling
or smudging the finish.
B. Clean glass
and frame at time of installation. Final cleaning,
if required, subsequent to completion of project,
is not to be performed by the manufacturer.
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3.07 PROTECTION
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A. The skylight
manufacturer does not provide, nor does it include
any temporary protection to the skylight and
its materials after the installation is complete.
Protection of the skylight from ongoing work
by other trades shall be the responsibility
of the General Contractor. The manufacturer
is responsible only for the damage caused by
the personnel under its control and responsibility.
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