SECTION
08920
STRUCTURAL
GLAZED ALUMINUM CURTAIN WALLS
PART
1 GENERAL
1.01
RELATED
DOCUMENTS
A.
Drawings
and general provisions of the Contract, including General, Special and
Supplementary Conditions and Division 1 Specification Sections, apply to
this Section.
1.02
SUMMARY
A.
This Section
includes the following:
1.
Structural
Glazed Aluminum Curtain Wall.
B.
Related
sections include the following:
1.
Division 7
Section ‘’Building Insulation’’ for firesafing field installed in
conjunction with glazed aluminum curtain wall system.
2.
Division 7
Section ‘’Joint Sealants” for joint sealants installed as part of
glazed aluminum curtain wall system.’
3.
Division 8
Section ‘’Aluminum Entrances and storefronts.’’
4.
Division 8
Section ‘’Glazing’’
1.03
SYSTEM DESCRIPTION
A.
General: Provide (4)
four sided structural glazed aluminum curtain wall system that has the
following capabilities based on testing manufacturer’s standard units in
assemblies similar to those indicated for this project:
1.
Withstands
loads, thermal and structural movement requirements indicated without
failure.
a.
Air
infiltration and water penetration exceeding specified limits.
b.
Framing
members transferring stresses, including those caused by thermal and
structural movement, to glazing units.
B.
Glazing is
physically and thermally isolated from framing members.
C.
System is
reglazable from the exterior.
D.
Wind Loads:
Provide glazed aluminum curtain wall system, including anchorage, capable
of withstanding wind-load design pressures calculated according to
requirements of authorities having jurisdiction or the American Society of
Civil Engineers’ ASCE 7, “Minimum Design Loads for Buildings and Other
Structures,” 6.4.2, “ Analytical Procedure, “ and the Florida
Building Code 2000, whichever are more stringent.
1.
Design wind
velocity at the project site is ____________.
2.
Deflection of
framing members in a direction normal to wall plain is limited to 1/175 of
clear span or 3/4 inches, whichever is smaller, unless otherwise
indicated.
3.
Deflection of
framing members in a direction normal to wall plane is limited to 1/360 of
clear span, ¾ inches maximum, where plaster or gypsum board are subject to bending.
4.
Deflection of
framing members overhanging an anchor point is limited to 2 times the
length of the cantilevered member, divided by 175.
E.
Dead Loads:
Provide glazed aluminum curtain wall system members that do not deflect an
amount, which will reduce glazing bite below 75 percent of design
dimension when carrying full dead load. Provide a minimum 1/8-inch
clearance between members and top of fixed panels, glazing or other fixed
part immediately below. Provide a minimum 1/16-inch clearance between
members and operable windows and doors.
F.
Live Loads:
Provide glazed aluminum curtain wall system, including anchorage, that
accommodates supporting structure’s deflection from uniformly
distributed and concentrated live loads indicated without failure of
materials or permanent deformation.
G.
Air Infiltration: Provide glazed aluminum curtain
wall system with permanent resistance to air leakage through system of not
more than 0.06 cfm/sq.ft. Have fixed wall area when tested according to
ASTM E 283 at a static-air-pressure difference of 6.24 lbf/sq.ft.
1.
Provide
operable windows with permanent resistance air leakage complying with AAMA
101 requirements for types of windows indicated.
H.
Water
Penetration: Provide glazed aluminum curtain wall system that does not
evidence water leakage when tested according to ASTM E 331 at minimum
differential pressure of 25 percent of inward acting wind-load design
pressure as defined by ASCE 7, “ Minimum Design Loads for Buildings and
other structures, “ but not less than 10 lbf/sq.ft.
I.
Thermal
Movements: Provide glazed aluminum curtain wall system, including
anchorage, that accommodates thermal movements of system and supporting
elements resulting from the following maximum change (range) in ambient
and surface temperatures without buckling, damaging stresses on glazing,
failure of joint sealants, damaging loads on fasteners, noise or vibration
and other detrimental effects.
1.
Temperature
Change (Range): 120 deg F, ambient; 180 deg F, material surfaces.
J.
Structural
Support Movement: Provide glazed aluminum curtain wall system that
accommodates structural movements including, but not limited to, sway,
twist, column shortening, long-term creep, and deflection.
K.
Condensation
Resistance: Provide glazed aluminum curtain wall system with
condensation-resistance factor (CRF) of not less than 55 when tested
according to AAMA 1503.1
L.
Average
Thermal Conductance: Provide glazed aluminum curtain wall system with an
average U-value of not more than 0.66 Btu/sq.ft. x h x deg F when tested
according to AAMA 1503.1
M.
Dimensional Tolerances: Provide glazed aluminum
curtain wall system, including anchorage that accommodates dimensional
tolerances of building frame and other adjacent construction.
1.03.01
TESTING
AND PERFORMANCE REQUIREMENTS
A.
Provide a
Curtain Wall System and application that is structurally sound, impact
resistance and weather tight conforming to applicable testing and
performance requirements described herein.
B.
Provide
certified independent laboratory test reports from an accredited
laboratory.
C.
Provide
certification for compliance with Florida Building Code 2001
D.
Test Units:
All tests, unless otherwise noted, shall conform to the impact,
static, cyclic, air and water testes as set forth by SBCCI and the
Miami-Dade County Building Code Compliance Off.
E.
Test
Procedure and performance:
1.
Curtain Walls
shall conform to criteria for conducting impact, static, cyclic air and
water tests set forth by the SBCCI and the Miami-Dade County Building Code
Compliance Office.
2.
Impact Test
– PA 201-94 and 1-3023.2
a.
Missile
Impact Curtain Walls with a solid S4S nominal 2 x 4, #2 surface dry,
Southern Pine of not less than 8’-6’ in length and 9 lbs in weight at
a velocity between 50 and 52 ft/sec. Without defined specimen failure.
3.
Cycle Wind
Pressure Loading Test – PA203-94 and 302.4 – 302.7.3
a.
Apply loads
to the specimen using the cycles specified in The South Florida Building
Code and as in Table 1 of SSTD 12-97 without failure.
b.
Specified
Design Pressure (DP) should not be less than 90 psf.
1.04
SUBMITTALS
A.
General:
Submit each item in this Article according to the Conditions of the
Contract and Division 1 Specification Sections.
B.
Product Data
for each product specified, including details of construction relative to
materials, dimensions of components, profiles, silicone sealant adhesion,
finishes.
C.
Shop Drawings
showing fabrication and installation of glazed aluminum curtain wall
system including plans, elevations, sections, details of components, and
attachments to other units of Work.
1.
For installed
products indicated to comply with certain design loadings, include
structural analysis data signed and sealed by the qualified professional
engineer responsible for their preparation.
D.
Samples for
initial selection in the form of manufacturer’s standard sizes. Where
finishes involve normal color and texture variations, include Sample sets
showing the full range of variations expected.
E.
Samples for
verification of each type of exposed finish required in manufacturer’s
standard sizes. Where finishes involve normal color and texture variations
expected.
F.
Cutaway
sample of each vertical-to-horizontal intersection of system, made from
12-inch lengths of full-size components and showing details of the
following:
1.
Joinery
2.
Anchorage
3.
Expansion
provisions
4.
Glazing
5.
Flashing and
drainage
G.
Welder Certificates indicating that welders comply
with requirements specified in “ Quality Assurance “ Article.
H.
Installer
certificates signed by installer
certifying that installer comply with requirements in “ Quality
Assurance “ Article.
I.
Product test
reports from a qualified independent testing agency evidencing compliance
of glazed aluminum curtain wall system with requirements based on
comprehensive testing of manufacturer’s current system.
1.05
QUALITY
ASSURANCE
A.
Professional
Engineer Qualifications: A professional engineer who is legally qualified
to practice in the jurisdiction where project is located and who is
experienced in providing engineering services of the kind indicated.
Engineering services are defined as those performed for installations of
glazed aluminum curtain wall systems that are similar to those indicated
for this Project in material, design, and extent.
B.
Installer
Qualifications: Engage an experienced installer to assume engineering
responsibility and perform work of this Section who has specialized in
installing glazed aluminum curtain wall systems similar to those required
for this Project and who is acceptable to manufacturer.
1.
Engineering
Responsibility: Engage a qualified professional engineer to prepare or
supervise the preparation of data for glazed aluminum curtain wall
systems, including drawings, testing program development, test-result
interpretation, and comprehensive engineering analysis that shows
systems’ compliance with specified requirements.
C.
Source
Limitations: Obtain each type of glazed aluminum curtain wall system from
one source and by a single manufacturer.
D.
Product
Options: Drawings indicate size, profiles, and dimensional requirements of
a structural glazed aluminum curtain wall system
based on the specific systems indicated. Other manufacturers’
systems with equal performance characteristics may be considered. Refer to
Project Manual general requirements for “ Substitutions “.
1.
Project’s
basis of design is Alumiglass, Inc.’s Alumiwall 6001 4SSG Curtain wall
System.
2.
Do not modify
intended aesthetic effects, as judged solely by architect, except with
Architect’s approval and only to the extent needed to comply with
performance requirements. Where modifications are proposed, submit
comprehensive explanatory data to architect for review.
E.
Welding
Standards: Comply with applicable provisions of AWSD 1.2, “Structural
Welding Code-Aluminum.”
1.
Engage
welders who have satisfactorily passed AWS qualification tests for welding
processes involved and who are currently certified for these processes.
F.
Mockups:
Prior to installing glazed aluminum curtain wall system, construct mockups
for each form of construction and finish required to verify selections
made under Sample submittals and to demonstrate aesthetic as well as
qualities of materials and execution. Build mockups to comply with the
following requirements, using materials indicated for work.
1.
Locate
mockups on-site in the location and of the size indicated or, if not
indicated, as directed by Architect.
2.
Notify
Architect 7 days in advance of the dates and times when mockups will be
constructed.
3.
Demonstrate
the proposed range of aesthetic effects and workmanship.
4.
Obtain
Architect’s approval of mockups before start of work.
5.
Retain
and maintain mockups during construction in an undisturbed condition as a
standard for judging the completed work.
a.
Approved
mockups in an undisturbed condition at the time of Substantial Completion
may become part of the completed work.
G.
Pre-installation
Conference: Conduct conference at Project site to comply with requirements
of Division 1 Section “Project
Meetings.”
1.06
PROJECT CONDITIONS
A.
Field Measurements: Verify dimensions by
field measurements before fabrication and show recorded measurements on
Shop Drawings. Coordinate fabrication schedule with construction progress
to avoid delaying the Work.
1.
Where
field measurements cannot be made without delaying the work, General
Contractor shall guarantee dimensions to the manufacturer, and fabrication
shall proceed without field measurements. Coordinate construction to
ensure that actual dimensions correspond to guarantee dimensions.
1.07
WARRANTY
A.
General
Warrant: The special warranty specified in this Article shall not deprive
the Owner of other rights the Owner may have under other provisions of the
Contract Documents and shall be in addition to, and run concurrent with,
other warranties made by the Contractor under requirements of the Contract
Documents.
B.
Special
Warranty: Submit a written warranty executed by the manufacturer and
installer, agreeing to repair or replace components of a glazed aluminum
curtain wall system that fail in materials or workmanship within the
specified warranty period. Failures include, but are not limited to, the
following:
1.
Structural
failures including, but not limited to, excessive deflection.
2.
Noise
or vibration caused by thermal movements.
3.
Failure
of system to meet performance requirements.
4.
Deterioration
of meals, metal finishes, and other materials beyond normal weathering.
5.
Water
leakage.
6.
Glazing
breakage.
7.
Delaminating.
C.
Warranty
Period: 2 years from date of Substantial Completion.
PART 2
PRODUCTS
2.01
MANUFACTURERS
A.
Manufacturers: The basis
or design is the design of the section is Alumiglass, Inc. Sales representative Savannah Trims, Inc. phone 888-640-0850.
Subject to compliance with requirements, design intent and these
specifications, other manufacturers, which are approved for a structural
glass curtain wall system, are:
1.
Kawneer Company, Inc.
2.
Tubelite Architectural
Systems.
2.02
MATERIALS
A.
Aluminum:
Alloy and temper recommended by manufacturer for type of use and finish
indicated, complying with the requirements of standards indicated below.
1.
Sheet and
plate: ASTM B 209
2.
Extruded
Bars, Rods, Shapes, and tubes: ASTM B 221.
3.
Extruded
Structural Pipe and Tubes: ASTM B 429.
4.
Welding Rods
and Bare Electrodes: AWS A5.10.
B.
Steel
Reinforcement: ASTM A 36 for structural shapes, plates, and bars; ASTM A
611 for cold-rolled sheet and strip; or ASTM A 570 for hot-rolled sheet
and strip.
1.
Provide only
where required by manufacturer to meet engineering requirements.
C.
Glazing as
specified in Division 8 Section “ Glazing.”
D.
Glazing
Gaskets: Manufacturer’s standard sealed-corner pressure-glazing system
of black, resilient elastomeric glazing gaskets, and shims or spacers; in
hardness recommended by manufacturer.
E.
Glazing
sealants and fillers as specified in Division 8 Section “ Glazing.”
F.
Framing
system gaskets and joint fillers as recommended by manufacturer for joint
type.
G.
Sealants and joint fillers for joints within glazed
aluminum curtain wall system as tested and approved by manufacturer.
H.
Fire-Safing
materials as specified in Division 7 Section “ Building
Insulation."
I.
Bituminous
Paint: Cold-applied asphalt-mastic paint complying with SSPC-Paint 12
requirements, except containing no asbestos, formulated for 30-mil
thickness per coat.
2.03
COMPONENTS
A.
Brackets and
Reinforcements: Provide manufacturers’ standard high-strength aluminum
brackets and reinforcements. Provide nonstaining, nonferrous shims for
aligning system components.
B.
Fasteners and
Accessories: Manufacturer’s standard corrosion-proof, nonstaining,
nonbleeding fasteners and accessories compatible with adjacent materials.
Finish exposed portions to match glazed aluminum curtain wall.
1.
At movement
joints, use slip-joint linings, spacers, and sleeves of material and type
recommended by manufacturer.
2.
Where
fasteners anchor into aluminum less than 0.125 inches thick, provide
reinforcement to receive fastener threads.
3.
Use exposed
fasteners with countersunk Phillips screw heads finished to match framing
members, unless otherwise indicated.
C.
Anchors:
3-way adjustable anchors that accommodate fabrication and installation
tolerances in materials and finish compatible with adjoining materials and
recommended by manufacturer.
1.
Concrete and
Masonry Inserts: Hot-dip galvanized cast-iron, malleable-iron, or steel
inserts complying with ASTM A 123 or ASTM A 153 requirements.
D.
Concealed
Flashing: Manufacturer’s standard corrosion-resistant, nonstaining,
nonbleeding flashing, compatible with adjacent materials, and of type
recommended by manufacturer.
2.04
FABRICATION
A.
General:
Fabricate glazed aluminum curtain wall systems according to shop Drawings.
Fabricate components that, when assembled, will have accurately fitted
joints with ends coped or mitered to produce hairline joints of burrs and
distortion. After fabrication, clearly mark components to identify their
locations in Project according to Shop Drawings.
B.
Forming: Form
shapes with sharp profiles, straight and free of defects or deformations,
before finishing.
C.
Prepare
components to receive concealed fasteners and anchor and connection
devices.
D.
Fabricate
components to drain water-passing joints, condensation occurring in
glazing channels, condensation occurring within framing members, and
moisture migrating within the system to the exterior.
E.
Welding: Weld
components to comply with referenced standard and Shop Drawings, unless
otherwise indicated. Weld before finishing components. Weld in concealed
locations to greatest extent possible to minimize distortion or
discoloration of finish. Remove weld spatter and welding oxides from
exposed surfaces by descaling or grinding.
F.
Glazing
Pockets: Provide minimum clearances for thickness and type of glass
indicated according to GANA’s “Glazing Manual.”
G.
Metal Protection: Where aluminum will contact
dissimilar metals, protect against galvanic action by painting contact
surfaces with primer or by applying sealant or tape recommended by
manufacturer for this purpose. Where aluminum will contact concrete or
masonry, protect against corrosion by painting contact surfaces with
bituminous paint.
H.
Frame Units:
Factory assembles frame units according to Shop Drawings to greatest
extent possible. Rigidly secure nonmovement joints. Seal joints
watertight, unless otherwise indicated. Assemble components to drain water
passing joints, condensation occurring within framing members, and
moisture migrating within the system to exterior.
I.
Install
glazing in the manufacturers shop, prior to shipment and according to Shop
Drawings. Comply with requirements of Division 8 Section “ Glazing,“
unless otherwise indicated.
2.05
ALUMINUM
A.
General:
Comply with NAMM’s “Metal Finishes Manual for Architectural and Metal
Products” for recommendations relative to applying and designating
finishes.
B.
Appearance of
Finished Work: Variations in appearance of abutting or adjacent pieces are
acceptable if they are within one-half of the range of approved Samples.
Noticeable variations in the same piece are not acceptable. Variations in
appearance of other components are acceptable if they are within the range
of approved Samples and are assembled or installed to minimize contrast.
C.
Finish
designations prefixed by AA confirm to the system established by the
Aluminum Association for designating aluminum finishes.
D.
Class I,
Clear Anodic Finish: AA-M12C22A41 (Mechanical Finish: nonspecular as
fabricated; Chemical Finish: etched, medium matte; Anodic Coating:
Architectural Class I clear coating 0.018mm or thicker) complying with
AAMA 607.1.
PART 3
EXECUTIONS
3.01
EXAMINATION
A.
Examine
areas, with Installer present, for compliance with requirements for
installation tolerances and other conditions affecting performance of
glazed aluminum curtain wall system. Do not proceed with installation
until unsatisfactory conditions have been corrected or accommodations
acceptable to architect have been made.
3.02
INSTALLATION
A.
General:
Comply with manufacturer’s written instructions for protecting,
handling, and installing glazed aluminum curtain wall system. Do not
install damaged components. Fit joints to produce hairline joints free of
burrs and distortion. Rigidly secure nonmovement joints. Seal joints
watertight, unless otherwise indicated. Provide means to drain water to
the exterior to produce a permanently weatherproof system.
B.
Metal
Protection: Where aluminum will contact dissimilar metals, protect against
galvanic action by painting contact surfaces with primer or by applying
sealant or tape recommended by manufacturer for this purpose. Where
aluminum will contact concrete or masonry, protect against corrosion by
painting contact surfaces with bituminous paint.
C.
Install
components to drain water-passing joints, condensation occurring in
glazing channels, condensation occurring within framing members, and
moisture migrating within the system to the exterior.
D.
Install
framing members plumb and true in alignment with established lines and
grades.
E.
Install
factory-assembled frame units plumb and true alignment with established
lines and grades.
F.
Anchorage:
After system components are positioned, fix connections to build structure
as indicated on Shop Drawings.
1.
Provide
separators and isolators to prevent metal corrosion and electrolytic
deterioration and to prevent impeding movement of moving joints.
G.
Welding: Weld components to comply with referenced
standard and Shop Drawings, unless otherwise indicated. Weld in concealed
locations to minimize distortion or discoloration of finish. Protect
glazing surfaces from welding.
H.
Install
glazing according to Shop Drawings. Comply with requirements Of Division 8
Section “Glazing,” unless
otherwise indicated.
I.
Install
sealant according to Shop Drawings. Comply with requirements of Division 7
Section “Joint Sealants,” unless otherwise indicated.
J.
Install fire-safing
in locations indicated. Comply with requirements of Division 7 Section
“Building Insulation,” unless otherwise indicated.
K.
Erection
Tolerances: Install pre-glazed aluminum curtain wall to comply with the
following maximum tolerances:
1.
Plumb: 1/8
inch in 10 feet; 1/4 inch in 40 feet.
2.
Level: 1/8
inch in 20 feet; 1/4 inch in 40 feet.
3.
Alignment:
Where surfaces abut in line, limit offset from true alignment to 1/16
inch; where a reveal or protruding element separates aligned surfaces by
less than 2 inches, limit offset to ½ inch.
4.
Location:
Limit variation from plane or location shown on Shop Drawings to 1/8 inch
in 12 feet; 1/2 inch over total length.
L.
Installer
shall furnish certification, signed by an officer of the Company,
certifyling that all work is installed per the contract documents and the
manufacturers shop drawings, and agreeing to the conditions
and terms of the warranty.
M.
Installer shall maintain a daily work log for each
day worked on the jobsite, noting manpower, installation progress,
problems encountered and all other issues of note.
3.03
PROTECTION
A.
General
Contractor shall provide final protection and maintain conditions, in a
manner acceptable to manufacturer and Installer that ensure glazed
aluminum curtain wall system is without damage or deterioration at the
time of Substantial Completion.
END OF
SECTION 08920
Purveyors
of Architectural Specialties
Phone (561) 656-2556
Fax (561) 656-2599
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