36C25622R0094 054000 Cold Formed Metal Framing .docx

REPLACE AHU #104 AND DUCTWORK BLDG. 7

DEPARTMENT OF VETERANS AFFAIRS HEALTH CARE SYSTEM-ALEXANDRIA, LA

PROJECT NO.: 502-19-107

SECTION 05 40 00

COLD-FORMED METAL FRAMING

GENERAL

DESCRIPTION

This section specifies materials and services required for installation of coldformed steel, including tracks and required accessories as shown and specified. This Section includes the following:

Exterior non-load-bearing steel stud curtain wall.

RELATED WORK

Section 01 81 13 SUSTAINABLE CONSTRUCTION REQUIREMENTS.

DESIGN REQUIREMENTS

Design steel in accordance with American Iron and Steel Institute Publication "Specification for the Design of ColdFormed Steel Structural Members", except as otherwise shown or specified.

Structural Performance: Engineer, fabricate and erect cold-formed metal framing with the minimum physical and structural properties indicated.

Design framing systems to withstand design loads without deflections greater than the following:

Exterior Non-Load-Bearing Wall: Lateral deflection of 1/360 of the wall height.

Design framing systems to provide for movement of framing members without damage or overstressing, sheathing failure, connection failure, undue strain on fasteners and anchors, or other detrimental effects when subject to a maximum ambient temperature change (range) of 67 degrees C (120 degrees F).

Design framing system to accommodate deflection of primary building structure and construction tolerances, and to maintain clearances at openings.

Design exterior non-load-bearing wall framing to accommodate lateral deflection without regard to contribution of sheathing materials.

Engineering Responsibility: Engage a fabricator who assumes undivided responsibility for engineering cold-formed metal framing by employing a qualified professional engineer to prepare design calculations, shop drawings, and other structural data.

SUBMITTALS

Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. All items indicated below are required submittals requiring Contracting Officer’s Representative (COR) review and approval Shop Drawings: Shop and erection drawings showing steel unit layout, connections to supporting members, and information necessary to complete installation as shown and specified.

Manufacturer's Literature and Data: Showing steel component sections and specifying structural characteristics.

Sustainable Construction Submittals:

Recycled Content: Identify postconsumer and preconsumer recycled content percentage by weight.

APPLICABLE PUBLICATIONS

Publications listed below form a part of this specification to extent referenced. Publications are referenced in text by basic designation only.

American Iron and Steel Institute (AISI): Specification and Commentary for the Design of Cold-Formed Steel Structural Members (2016) ASTM International (ASTM):

American Welding Society (AWS):

D1.3/D1.3M-18 Structural Welding Code-Sheet Steel Military Specifications (Mil. Spec.):

MIL-P-21035B Paint, High Zinc Dust Content, Galvanizing Repair VA Physical Security and Resiliency Design Manual October 1, 2020.

PRODUCTS

MATERIALS

Sheet Steel for joists, studs, and accessories 18 gauge and lighter: ASTM A653, structural steel, zinc coated G90, with a yield of 230 MPa (33 ksi) minimum.

Galvanizing Repair Paint: MILP21035B.

Nonmetallic, Non-shrink Grout: Premixed, nonmetallic, noncorrosive, nonstaining grout containing selected silica sands, Portland cement, shrinkage-compensating agents, plasticizing and water-reducing agents, complying with ASTM C1107, with fluid consistency and a 30-minute working time.

WALL FRAMING

Steel Studs: Complying with ASTM C 955. Manufacturer’s standard C-shaped steel studs of web depth indicated, with lipped flanges, and complying with the following:

Minimum Base-Steel Thickness(uncoated): 0.84 mm (0.0329 inch) Flange Width: 1-5/8 inches Web: Punched.

Steel Track: Manufacturer’s standard U-shaped steel track, unpunched, of web depths indicated, with straight flanges, and complying with the following:

Design Uncoated-Steel Thickness: Matching steel studs.

Flange Width: Manufacturer’s standard deep flange where indicated, standard flange elsewhere.

FRAMING ACCESSORIES

Fabricate steel framing accessories of the same material and finish used for framing members, with a minimum yield strength of 230 MPa (33 ksi).

Provide accessories of manufacturer’s standard thickness and configuration, unless otherwise indicated, as follows:

Supplementary framing.

Bracing, bridging, and solid blocking.

Web stiffeners.

Gusset plates.

Deflection track and vertical slide clips.

Stud kickers and girts.

Reinforcement plates.

ANCHORS, CLIPS, AND FASTENERS

Steel Shapes and Clips: ASTM A36, zinc coated by the hot-dip process according to ASTM A123.

Cast-in-Place Anchor Bolts and Studs: ASTM A307, Grade A, zinc coated by the hot-dip process according to ASTM A153.

Expansion Anchors: Fabricated from corrosion-resistant materials, with capability to sustain, without failure, a load equal to 5 times the design load, as determined by testing per ASTM E488 conducted by a qualified independent testing agency.

Power-Actuated Anchors: Fastener system of type suitable for application indicated, fabricated from corrosion-resistant materials, with capability to sustain, without failure, a load equal to 10 times the design load, as determined by testing per ASTM E1190 conducted by a qualified independent testing agency.

Mechanical Fasteners: Corrosion-resistant coated, self-drilling, self-threading steel drill screws. Low-profile head beneath sheathing, manufacturer’s standard elsewhere.

REQUIREMENTS

Welding in accordance with AWS D1.3 Furnish members and accessories by one manufacturer only.

EXECUTION

FABRICATION

Framing components may be preassembled into panels. Panels shall be square with components attached.

Cut framing components squarely or as required for attachment. Cut framing members by sawing or shearing; do not torch cut.

Hold members in place until fastened.

Fasten cold-formed metal framing members by welding or screw fastening, as standard with fabricator. Wire tying of framing members is not permitted.

Comply with AWS requirements and procedures for welding, appearance and quality of welds, and methods used in correcting welding work.

Locate mechanical fasteners and install according to cold-formed metal framing manufacturer’s instructions with screw penetrating joined members by not less than 3 exposed screw threads.

Where required, provide specified insulation in double header members and double jamb studs which will not be accessible after erection.

ERECTION

Securely anchor tracks to supports as shown.

At butt joints, securely anchor two pieces of track to same supporting member or buttweld or splice together.

Plumb, align, and securely attach studs to flanges or webs of both upper and lower tracks.

All axially loaded members shall be aligned vertically to allow for full transfer of the loads down to the foundation. Vertical alignment shall be maintained at floor/wall intersections.

Install jack studs above and below openings and as required to furnish support. Securely attach jack studs to supporting members.

Install headers in all openings that are larger than the stud spacing in that wall.

Attach bridging for studs in a manner to prevent stud rotation. Space bridging rows as shown.

Studs in one piece for their entire length, splices will not be permitted.

Provide a load distribution member at top track where joist is not located directly overbearing stud.

Provide joist bridging and web stiffeners at reaction points where shown.

Provide end blocking where joist ends are not restrained from rotation.

Provide an additional joist under parallel partitions, unless otherwise shown, when partition length exceeds onehalf joist span and when floor and roof openings interrupt one or more spanning members.

Provide temporary bracing and leave in place until framing is permanently stabilized.

Do not bridge building expansion joints with cold-formed metal framing. Independently frame both sides of joints.

Fasten reinforcement plate over web penetrations that exceed size of manufacturer’s standard punched openings.

TOLERANCES

Vertical alignment (plumbness) of studs shall be within 1/960th of the span.

Horizontal alignment (levelness) of walls shall be within 1/960th of their respective lengths.

Spacing of studs shall not be more than 3 mm (1/8 inch) +/- from the designed spacing providing that the cumulative error does not exceed the requirements of the finishing materials.

FIELD REPAIR

Touchup damaged galvanizing with galvanizing repair paint.

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