SECTION 05400
LIGHTGAUGE STEEL FRAMING
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Use this guide specification to specify light gauge
steel stud
framing systems. Review a copy of USG publication
SA-923, and
UNIMAST publication UN 30 before editing specification.
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PART 1 - GENERAL
1.01 GENERAL DOCUMENTS:
General and Supplementary Conditions of Contract
as well as
Drawings and general provisions of Contract and Division
1
Specification section, apply to work of this section.
1.02 DESCRIPTION OF WORK:
Extent of steel stud framing is shown on drawings
and
schedules. Included are "C" shaped steel
studs,
miscellaneous track, channels, clips, bracing, bridging
and
fasteners necessary for complete installation
Coordinate with all trades required to install work
on or
into work of this section.
Related Work Specified Elsewhere
Concrete - Section 03310
Carpentry - Section 06100
Insulation - Section 07200
Lath and Plaster - Section 09200
Portland Cement Plastering - Section 09220
Gypsum Drywall - Section 09250
Gypsum Sheathing - Section 09262
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Include additional related sections as pertinent.
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1.03 QUALITY ASSURANCE:
Standards:
ASTM A-446 Standard Specification for Steel Sheet,
Zinc-coated (Galvanized) by the Hot-Dip Process,
Structural (Physical) Quality
ASTM A-525 Standard Specification for General
Requirements for Steel Sheet, Zinc-Coated
(Galvanized) by the Hot-Dip Process.
ASTM A-568 Standard Specification for Steel, Sheet,
Carbon, and High-Strength, Low-Alloy, Hot-Rolled
and
Cold-Rolled
ASTM A-780 Practice for Repair of Damaged Hot-Dip
Galvanized Coatings
ASTM C-955 Standard Specification for Load-Bearing
(Transverse and Axial) Steel Studs, Runners (Track),
and Bracing or Bridging for Screw Application of
Gypsum
Board and Metal Plaster Bases
ASTM C-1002 Standard Specification for Steel Drill
Screws for the Application of Gypsum Board.
ASTM C-1007 Standard Specification for Installation
of
Load Bearing (Transverse and Axial) Steel Studs
and
Related Accessories
AWS "Code for Welding in Building Construction,
D1.0"
AWS "Specification for Welding Sheet Steel
in
Structures, D1.3"
ANSI Z49.1 "Safety in Welding and Cutting"
AISI "Specification for the Design of Cold-Formed
Steel
Structural Members"
Fire-Resistance Rating: Where fire resistance rating
is
required, provide materials and installation which
are in
compliance with those of applicable assemblies tested
per
ASTM E119 by fire testing laboratories acceptable
to
authorities having jurisdiction.
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If mock-up is required identify location at the site,
size
required and if special tests will be conducted relative
to same
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Unit Responsibility: Obtain lightgage steel framing
materials including fasteners and related accessories
from a
single manufacturer to ensure consistency in quality
of
performance and appearance.
Performance:
Design wind loads shall be in accordance with applicable
building code or as shown on the drawings.
Design floor and roof loading, dead and live, shall
be in
accordance with applicable building code or as shown
on the
drawings. Maximum live load deflection of steel
joists
shall be (L/360) ( "other").
Maximum allowable wall deflection under transverse
loading
shall be (L/360) (L/600) ("other"), based
on stud properties
only.
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Maximum deflection is based on that allowable for
the finish
material.
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Designs shall include verification that allowable
steel
stress and end reaction are not exceeded in conformance
to
1986 AISI Specification for the Design of Cold-Formed
Steel
Structural Members.
1.04 SUBMITTALS:
Product Data: Submit manufacturer's product specifications
and installation instructions for systems used.
Certificates: Submit certification of compliance
with fire
and sound requirements indicated.
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Copies of actual fire and sound test reports can
be specified for
submittal.
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Samples: Furnish standard size sample of each linear
or
continuous product, and one sample of all other components
required for project.
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Delete "Samples" paragraph if none required.
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Shop Drawings: Submit shop drawings for special
components
and installations not fully dimensioned or detailed
in the
Manufacturer's product data. Submit complete structural
calculations signed, sealed and dated by a registered
Professional Engineer indicating compliance with
all
applicable local and state codes with certification
that all
design loads have been accommodated for members and
components, for all conditions. Indicate design
loads
required, member stresses, member deflection limitation,
and
connection designs.
All welds, both shop and field, shall be indicated
using AWS
"Welding Symbols, A2.0". Submit written
description, as
required, to illustrate each welding procedure to
be
performed in the work.
Placing Drawings: Submit placing drawings for framing
members showing size and gauge designations, number,
type,
location and spacing. Indicate supplemental strapping,
bracing, splices, bridging, accessories and details
required
for proper installation.
1.05 DELIVERY, STORAGE AND HANDLING:
Handling: Handle materials to avoid damage.
Delivery: Deliver materials to the jobsite in original
packages, containers, or bundles bearing the brand
name and
manufacturer's identification.
Storage: Store materials in dry locations with adequate
ventilation, free from water, and in such a manner
to permit
easy access for inspection and handling. Damaged
materials
shall be removed from the job site. Store and maintain
welding electrodes in accordance with AWS "Code
for Welding
in Building Construction, D1.0", latest edition.
1.06 PROJECT CONDITIONS:
Protect adjacent work of other trades from damage,
physical
distress, etc.
PART 2 - PRODUCTS
2.01 MANUFACTURER:
Subject to compliance with requirements, provide
lightgauge
steel framing, and all related components, as manufactured
by Unimast, Inc. and supplied by United States Gypsum
Co.
2.02 MATERIALS:
A. ST Style Steel Studs:
(212ST20) (358ST20) (400ST20) (600ST 20)
Runner: (Select CR20 Runner to match)
B. SJ Style Steel Studs/Joists:
(362SJ20) (362SJ18) (362SJ16) (362SJ14) (40SJ20)
(40SJ18) (40SJ16) (40SJ14) (60SJ20) (60SJ18) (60SJ16)
(60SJ14) (725SJ18) (725SJ16) (725SJ14) (80SJ18)
(80SJ16) (80SJ14) (925SJ16) (925SJ14) (115SJ16)
(115SJ14) (135SJ14)
Runner: (Select 1-1/4" leg CR-Runner to match
stud
style. CR18 styles may be used with SJ16 and SJ14
studs.)
C. Finish: Provide galvanized finish to metal framing
components complying with ASTM A525 for a minimum
G60
coating.
D. Fasteners:
Provide nuts, bolts washers, screws, and other
fasteners with corrosion resistant finish
Welding Electrodes: Comply with AWS Code.
2.03 FABRICATION:
Framing components may be prefabricated into assemblies
before erection. Fabricate panels plumb, square,
true to
line, and braced against racking with joints welded.
Fabricate units in jig templates to hold members
in proper
alignment and position and to assure consistent component
placement and full bearing at runner track.
Attach similar components by welding. Attach dissimilar
components by welding, bolting, or screw fasteners.
PART 3 EXECUTION:
3.01 PRE-INSTALLATION CONFERENCE:
Prior to start of installation of lightgauge metal
framing
systems, Contractor and sub-contractors shall meet
at
project site with installers of related work including
door
and window frames and mechanical and electrical work.
Review
areas of potential interference and conflicts, and
coordinate layout and support provisions for interfacing
work.
3.02 RUNNER TRACK INSTALLATION:
Install continuous runner tracks sized to match studs.
Align
tracks accurately to layout at base and tops of studs.
Secure tracks with suitable fasteners for the type
of
construction involved spaced not more than (24")
(20") (16")
(12") (8") o.c., as required by design
to resist lateral
forces. Provide fasteners at corners and ends of
tracks.
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See Runner Attachment Spacing Table, SA-923 for recommended
spacing of fasteners.
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3.03 STUD ERECTION - WIND LOAD ONLY:
Studs shall be plumbed, aligned, and securely attached
to
flanges of both top and bottom runners by welding
or screw
fastening. Studs shall be one piece full length;
splicing
is not permitted. Jack studs or cripples shall be
installed
below window sills, above window and door heads,
and
elsewhere to furnish supports, and shall be securely
attached to connecting members. Provisions for vertical
structural movement shall be provided where shown
on the
drawings. Lateral bracing shall be provided by use
of
gypsum board and gypsum sheathing and/or by horizontal
straps or cold-rolled channels securely fastened
to the
studs.
3.04 STUD ERECTION - AXIAL LOAD BEARING:
Complete, uniform and level bearing support shall
be
provided for the bottom runner. Studs shall be plumbed,
aligned, fully seated in the bottom runner, and securely
attached to flanges of both top and bottom runners
by
welding or screw fastening. All studs should be
aligned
vertically from floor to floor. Framing of wall
openings
shall include headers and supporting studs as shown
on
drawings.Temporary bracing shall be provided until
erection
is completed. Resistance to bending and rotation
about the
minor axis shall be provided by gypsum board and
gypsum
sheathing and/or horizontal straps or cold-rolled
cold-
rolled channels securely fastened to the studs.
Diagonally
braced walls shall be provided at locations designated
as
"shear walls" for frame stability and lateral
load
resistance. Additional studs shall be positioned
as
indicated on drawings to resist the vertical load
components. Splicing axially loaded studs is not
permitted.
3.05 SUPPLEMENTARY PARTITION FRAMING:
Install supplementary framing, blocking and bracing
in metal
framing system wherever partitions are indicated
to support
fixtures, equipment, services, casework, heavy trim
and
furnishings and similar work requiring attachment
to the
partition.
Frame wall openings with proper framing to accommodate
the
opening size and applied loads. Frame both sides
of control
joints with separate studs
3.06 ERECTION - JOISTS:
Uniform and level joist bearing shall be provided
at
foundation walls by means of shims and/or non-settling
grout. Locate joists directly over bearing studs
or provide
a load distribution member at the top of the bearing
wall.
Provide web stiffeners at reaction points and/or
at points
of concentrated loads where indicated on the drawings.
Provide joist bridging where indicated on the drawings.
Provide end blocking where joist ends are not otherwise
restrained from rotation.
3.07 INSULATION:
Insulation equal to that specified in Section 07200
shall be
provided in all doubled jamb studs and headers not
accessible to insulation contractor.
3.08 FIELD PAINTING:
Where galvanized surfaces are damaged, prepare surfaces
and
repair in accordance with procedures specified in
ASTM A-
780.
3.09 CLEAN-UP:
At the completion of lightgage steel framing work
remove all
related rubbish, excess material, scaffolding, tools
and
equipment from the site.
End of Section 05400
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Copyright 1991 by United States Gypsum Co.
A limited license is extended to qualified design
professionals
to duplicate and print this guide specification for
the purpose
of incorporating products manufactured and/or sold
by U.S. Gypsum
Co into a construction specification or purchase
order.
Notice: We shall not be liable for incidental and
consequential
damages, directly or indirectly sustained, nor for
any loss
caused by application of these goods not in accordance
with
current printed instructions or for other than the
intended use.
Our liability is expressly limited to replacement
of defective
goods. Any claim shall be deemed waived unless made
in writing
to us within thirty (30) days from date it was or
reasonably
should have been discovered.
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