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SECTION 05400
LIGHTGAUGE STEEL FRAMING ***************************************************************** 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 ***************************************************************** 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. ***************************************************************** If mock-up is required identify location at the site, size required and if special tests will be conducted relative to same *****************************************************************
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. ***************************************************************** 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. ***************************************************************** 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. ***************************************************************** 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. ***************************************************************** 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. ***************************************************************** |