3 SECTION COLD-FORMED METAL FRAMING

Transcription

1 3 SECTON COLD-FORMED METAL FRAMNG PART 1 - GENERAL RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. * 1.2 SUMMARY A. This Section includes the following: 1. Exterior load-bearing wall framing. 2. nterior load-bearing wall framing. 3. Exterior non-load-bearing wall framing. 4. Floor joist framing. 5. Roof trusses. 6. Roof rafter framing. 7. Ceiling joist framing. B. Related Sections include the following: 1. Division 5 Section "Metal Fabrications" for masonry shelf angles and connections. 2. Division 9 Section "Gypsum Board Assemblies" for interior non-load-bearing, metalstud framing and ceiling-suspension assemblies. 3. Division 9 Section "Gypsum Board Shaft-Wall Assemblies" for interior non-loadbearing, metal-stud-framed, shaft-wall assemblies DEFNTONS A. Minimum Uncoated Steel Thickness: Minimum uncoated thickness of cold-formed framing delivered to the Project site shall be not less than 95 percent of the thickness used in the cold-formed framing design. Lesser thicknesses shall be permitted at bends due to cold forming. B. Producer: Entity that produces steel sheet coil fabricated into cold-formed members PERFORMANCE REQUREMENTS Sdesign A. Structural Performance: Provide cold-formed metal framing capable of withstanding loads within limits and under conditions indicated. 1. Deflection Limits: Design framing systems to withstand design loads without deflections greater than the following: a. Exterior Load-Bearing Wall Framing: Horizontal deflection of 1/600 of the wall height for backing brick veneer and 1/360 of the wall height for backing others. COLD-FORMED METAL FRAMNG

2 i SECTON COLD-FORMED METAL FRAMNG 3 b. nterior Load-Bearing Wall Framing: Horizontal deflection of 1/360 of the wall height under a horizontal load of 5 lbf/sq. ft. c. Exterior Non-Load-Bearing Framing: Horizontal deflection of 1/600 of the wall height for backing brick veneer and 1/360 of the wall height for backing others. d. Floor Joist Framing: Vertical deflection of 1/480 for live loads and 1/360 for 3 total loads of the span. e. Roof Trusses: Vertical deflection of 1/360 of the span. f. Scissor Roof Trusses: Horizontal deflection of 1-1/4 inches at reactions. g. Roof Rafter Framing: Horizontal deflection of 1/360 of the horizontally projected span. h. Ceiling Joist Framing: Vertical deflection of 1/360 of the span. 2. 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 of 120 deg. F. 3. Design framing system to maintain clearances at openings, to allow for construction tolerances, and to accommodate live load deflection of primary building structure as follows: a. Upward and downward movement of 1/2 inch. B. Cold-Formed Steel Framing, General: Design according to AS's "Standard for Cold- i Formed Steel Framing - General Provisions." 1. Headers: Design according to AS's "Standard for Cold-Formed Steel Framing - Header Design." i 2. Design exterior non-load-bearing wall framing to accommodate horizontal deflection without regard for contribution of sheathing materials. 1.5 SUBMTTALS A. Product Data: For each type of cold-formed metal framing product and accessory 3 indicated. B. Shop Drawings: Show layout, spacings, sizes, thicknesses, and types of cold-formed 3 metal framing; fabrication; and fastening and anchorage details, including mechanical fasteners. Show reinforcing channels, opening framing, supplemental framing, strapping, bracing, bridging, splices, accessories, connection details, and attachment to adjoining work. 1. For cold-formed metal framing indicated to comply with design loads, include i structural 1.6 Analysis data signed and sealed by the qualified professional engineer responsible for their preparation. A. Mill certificates signed by steel sheet producer or test reports from a qualified independent testing agency indicating steel sheet complies with requirements. COLD-FORMED METAL FRAMNG l

3 3 SECTON COLD-FORMED METAL FRAMNG B. Welding Certificates: Copies of certificates for welding procedures and personnel. i C. Qualification Data: For firms and persons specified in "Quality Assurance" Article to demonstrate their capabilities and experience. nclude lists of completed projects with project names and addresses, names and addresses of architects and owners, and other information specified. D. Product Test Reports: From a qualified testing agency indicating that each of the following complies with requirements, based on comprehensive testing of current products: 1. Expansion anchors. 2. Steel Sheet. 3. Power-actuated anchors. 4. Mechanical fasteners. 5. Vertical deflection clips. 6. Miscellaneous structural clips and accessories. 5 E. Research/Evaluation Reports: Evidence of cold-formed metal framing's compliance with building code in effect for Project, from a model code organization acceptable to authorities having jurisdiction. 1.7 QUALTY ASSURANCE A. nstaller Qualifications: An experienced installer who has completed cold-formed metal framing similar in material, design, and extent to that indicated for this Project and whose 3 work has resulted in construction with a record of successful in-service performance. B. Engineering Responsibility: Engage a qualified professional engineer to prepare design 3 calculations, Shop Drawings, and other structural data. C. Professional Engineer Qualifications: A professional engineer who is legally qualified to practice in 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 cold-formed metal framing that are similar to those indicated for this Project in material, design, and extent. D. Mill certificates signed by steel sheet producer or test reports from a qualified independent testing agency indicating steel sheet complies with requirements, including uncoated steel thickness, yield strength, tensile strength, total elongation, chemical requirements, ductility, and galvanized-coating thickness. E. Testing Agency Qualifications: An independent testing agency, acceptable to authorities having jurisdiction, qualified according to ASTM E 329 to conduct the testing indicated, as documented according to ASTM E F. Welding: Qualify procedures and personnel according to AWS D.1, "Structural Welding Code--Steel," and AWS D1.3, "Structural Welding Code--Sheet Steel." SCOLD-FORMED METAL FRAMNG

4 SECTON COLD-FORMED METAL FRAMNG 3 G. Fire-Test-Response Characteristics: Where metal framing is part of a fire-resistancerated assembly, provide framing identical to that of assemblies tested for fire resistance per ASTM E 119 by a testing and inspecting agency acceptable to authorities having jurisdiction. 1. Fire-Resistance Ratings: ndicated by GA File Numbers in GA-600, "Fire Resistance i Design Manual," or by design designations from UL's "Fire Resistance Directory" or from the listings of another testing and inspecting agency. H. AS Specifications: Comply with AS's "Specification for the Design of Cold-Formed Steel Structural Members" for calculating structural characteristics of cold-formed metal framing: 1. CCFSS Technical Bulletin: "AS Specification Provisions for Screw Connections.". Comply with HUD's "Prescriptive Method for Residential Cold-Formed Steel Framing." i J. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 1 Section "Project Meetings." 1.8 DELVERY, STORAGE, AND HANDLNG 3 A. Protect cold-formed metal framing from corrosion, deformation, and other damage during delivery, storage, and handling. B. Store cold-formed metal framing, protect with a waterproof covering, and ventilate to avoid condensation. l U i PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Available Manufacturers: Subject to compliance with requirements, manufacturers i offering cold-formed metal framing that may be incorporated into the Work include, but are not limited to, the following: 3 B. Manufacturers: Subject to compliance with requirements, provide cold-formed metal framing by one of the following: 3. Allied Studco, nc. 2. The Steel Network, nc Dietrich ndustries, nc. 4. AllSteel Products, nc. 5. Knorr Steel Framing Systems. 6. MarinoWare; Div. of Ware ndustries, nc. 7. Unimast, nc. 8. United Metal Products, nc. 3 COLD-FORMED METAL FRAMNG

5 3 SECTON COLD-FORMED METAL FRAMNG 9. Clark Steel Framing. 10. Steel Construction Systems MATERALS A. Steel Sheet: ASTM A 653/A 653M, structural steel, zinc coated, of grade and coating as follows: 1. Grade: 33 minimum or as required by structural performance. 2. Coating: G60. B. Steel Track: Manufacturer's standard U-shaped steel track, of web depths indicated, unpunched, with unstiffened flanges, complying with ASTM C 955, and as follows: 1 1. Minimum Uncoated-Steel Thickness: Matching steel studs. C. Single Deflection Track: Manufacturer's single, deep-leg, U-shaped steel track; unpunched, with unstiffened flanges, of web depth to contain studs while allowing free vertical movement, with flanges designed to support horizontal and lateral loads, and as follows:. 1. Minimum Uncoated-Steel Thickness: Matching steel studs. 2. Flange Width: Manufacturer's standard deep flange width D. Vertical Deflection Clips: Manufacturer's standard clips, capable of accommodating upward and downward vertical displacement of primary structure. 2.3 LOAD-BEARNG WALL FRAMNG 3 A. Steel Studs: Manufacturer's standard C-shaped steel studs, of web depths indicated, punched, with stiffened flanges, and as follows: 3 1. Minimum Base-Metal Thickness inch 2. Flange Width: 1-5/8 inches B. Steel Studs: Manufacturer's standard C-shaped steel studs, of web depths indicated, punched, with stiffened flanges, and as follows: 1. Minimum Base-Metal Thickness: inch 3 2. Flange Width: 1-5/8 inches C. Steel Track: Manufacturer's standard U-shaped steel track, of web depths indicated, unpunched, with straight flanges, and as follows: 1. Minimum Base-Metal Thickness: inch 2. Flange Width: 1-1/4 inches 3 COLD-FORMED METAL FRAMNG

6 SECTON COLD-FORMED METAL FRAMNG D. Steel Box or Back-to-Back Headers: Manufacturer's standard C-shapes used to form header beams, of web depths indicated, punched, with stiffened flanges, and as follows: 1. Minimum Base-Metal Thickness inch 2. Flange Width: 1-5/8 inches. 2.4 EXTEROR NON-LOAD-BEARNG WALL FRAMNG A. Steel Studs: Manufacturer's standard C-shaped steel studs, of web depths indicated, punched, with stiffened flanges, and as follows: 1. Minimum Base-Metal Thickness: inch 2. Flange Width: 1-5/8 inches 3 B. Steel Track: Manufacturer's standard U-shaped steel track, of web depths indicated, unpunched, with unstiffened flanges, and as follows: 1. Minimum Base-Metal Thickness inch 2. Flange Width: 1-1/4 inches C. Vertical Deflection Clips: Manufacturer's standard head clips, capable of accommodating upward and downward vertical displacement of primary structure through positive mechanical attachment to stud web Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 2. Manufacturers: Subject to compliance with requirements, provide products by one of the following: a. Dietrich Metal Framing; a Worthington ndustries Company. b. MarinoWare, a division of Ware ndustries. c. SCAFCO Corporation d. The Steel Network, nc. D. Single Deflection Track: Manufacturer's single, deep-leg, U-shaped steel track; i unpunched, with unstiffened flanges, of web depth to contain studs while allowing free vertical movement, with flanges designed to support horizontal and lateral loads and transfer them to the primary structure, and as follows:. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 2. Manufacturers: Subject to compliance with requirements, provide products by one of the following: a. Dietrich Metal Framing; a Worthington ndustries Company. b. MarinoWare, a division of Ware ndustries. l COLD-FORMED METAL FRAMNG

7 3 SECTON COLD-FORMED METAL FRAMNG c. SCAFCO Corporation 3 d. The Steel Network, nc. 3. Minimum Base-Metal Thickness: Flange Width: 1 inch plus the design gap for 1-story structures E. Double Deflection Tracks: Manufacturer's double, deep-leg, U-shaped steel tracks, 3 consisting of nested inner and outer tracks; unpunched, with unstiffened flanges. 1. Outer Track: Of web depth to allow free vertical movement of inner track, with flanges designed to support horizontal and lateral loads and transfer them to the primary structure, and as follows: a. Minimum Base-Metal Thickness: inch 3 b. Flange Width: 1 inch plus the design gap for i-story structures 2. nner Track: Of web depth indicated, and as follows: a. Minimum Base-Metal Thickness: inch b. Flange Width: Equal to sum of outer deflection track flange width plus 1 * inch F. Drift Clips: Manufacturer's standard bypass or head clips, capable of isolating wall stud from upward and downward vertical displacement and lateral drift of primary structure. 2.5 FLOOR JOST FRAMNG A. Steel Joists: Manufacturer's standard C-shaped steel sections, of web depths indicated, 1 unpunched with stiffened flanges, and as follows: 1. Minimum Base-Metal Thickness: inch 2. Flange Width: 1-5/8 inches B. Steel Joist Track: Manufacturer's standard U-shaped steel joist track, of web depths indicated, unpunched, with unstiffened flanges, and as follows: 11. Minimum Base-Metal Thickness: inch 2. Flange Width: 1-5/8 inches minimum. 2.6 ROOF TRUSSES A. Roof Truss Members: Manufacturer's standard C-shaped steel sections, of web depths indicated, unpunched with stiffened flanges, and as follows: 3 1. Minimum Base-Metal Thickness: inch 2. Flange Width: 1-5/8 inches 3 COLD-FORMED METAL FRAMNG

8 SECTON COLD-FORMED METAL FRAMNG 2.7 ROOF-RAFTER FRAMNG A. Steel Rafters: Manufacturer's standard C-shaped steel sections, of web depths indicated, i unpunched with stiffened flanges, and as follows: 1. Minimum Base-Metal Thickness: inch 3 2. Flange Width: 1-5/8 inches B. Built-up Members: Built-up members of manufacturer's standard C-shaped steel section, i with stiffened flanges, nested into a U-shaped steel section joist track, with unstiffened flanges; unpunched; of web depths indicated; and as follows: 1. Minimum Base-Metal Thickness: inch i 2. Flange Width: 1-5/8 inches l 2.8 CELNG JOST FRAMNG A. Steel Joists: Manufacturer's standard C-shaped steel sections, of web depths indicated, 3 unpunched with stiffened flanges, and as follows: 1. Minimum Base-Metal Thickness: inch 2. Flange Width: 1-5/8 inches 2.9 FRAMNG ACCESSORES 3 A. Fabricate steel-framing accessories from steel sheet, ASTM A 1003/A 1003M, Structural Grade, Type H, metallic coated, of same grade and coating weight used for framing members. B. Provide accessories of manufacturer's standard thickness and configuration, unless otherwise indicated, as follows:. Supplementary framing. 2. Bracing, bridging, and solid blocking.m 3. Web stiffeners. 4. Anchor clips. 5. End clips. 6. Foundation clips. 7. Gusset plates. 8. Stud kickers, knee braces, and girts. 9. Joist hangers and end closures. 10. Hole reinforcing plates. 11. Backer plates ANCHORS, CLPS, AND FASTENERS A. Steel Shapes and Clips: ASTM A 36/A 36M, zinc coated by hot-dip process according to ASTM A 123. g COLD.-FORMED METAL FRAMNG

9 3 SECTON COLD-FORMED METAL FRAMNG B. Anchor Bolts: ASTM F 1554, Grade 36, threaded carbon-steel hex-headed bolts and carbon-steel nuts; and flat, hardened-steel washers; zinc coated by hot-dip process according to ASTM A 153/A 153M, Class C. C. Expansion Anchors: Fabricated from corrosion-resistant materials, with capability to sustain, without failure, a load equal to 5 times design load, as determined by testing per ASTM E 488 conducted by a qualified independent testing agency. * D. 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 design load, as determined by testing per ASTM E 1190 conducted by a qualified independent testing agency. E. Mechanical Fasteners: Corrosion-resistant-coated, self-drilling, self-threading steel drill screws. 1. Head Type: Low-profile head beneath sheathing, manufacturer's standard elsewhere. 3 F. Welding Electrodes: Comply with AWS standards MSCELLANEOUS MATERALS A. Galvanizing Repair Paint: SSPC-Paint 20 or DOD-P B. Cement Grout: Portland cement, ASTM C 150, Type ; and clean, natural sand, ASTM C 404. Mix at ratio of 1 part cement to 2-1/2 parts sand, by volume, with minimum water required for placement and hydration. C. Nonmetallic, Nonshrink Grout: Premixed, nonmetallic, noncorrosive, nonstaining grout containing selected silica sands, portland cement, shrinkage-compensating agents, and plasticizing and water-reducing agents, complying with ASTM C 1107, with fluid consistency and 30-minute working time. D. Shims: Load bearing, high-density multimonomer plastic, nonleaching. E. Sealer Gaskets: Closed-cell neoprene foam, 1/4 inch thick, selected from manufacturer's standard widths to match width of bottom track or rim track members FABRCATON A. Fabricate cold-formed metal framing and accessories plumb, square, and true to line, and with connections securely fastened, according to manufacturer's written recommendations and requirements in this Section. 1. Fabricate framing assemblies using jigs or templates. 2. Cut framing members by sawing or shearing; do not torch cut. 3. Fasten cold-formed metal framing members by welding. Wire tying of framing members is not permitted. Comply with AWS D1.3 requirements and procedures for welding, appearance and quality of welds, and methods used in correcting welding 3 work. COLD-FORMED METAL FRAMNG

10 SECTON COLD-FORMED METAL FRAMNG 4. Fasten cold-formed metal framing members by welding or screw fastening, as standard with fabricator. Wire tying of framing members is not permitted. a. Comply with AWS D1.3 requirements and procedures for welding, appearance and quality of welds, and methods used in correcting welding work. b. Locate mechanical fasteners and install according to Shop Drawings, with screw penetrating joined members by not less than three exposed screw threads. 5. Fasten other materials to cold-formed metal framing by welding, bolting, or screw fastening, according to Shop Drawings. 3 B. Reinforce, stiffen, and brace framing assemblies to withstand handling, delivery, and erection stresses. Lift fabricated assemblies to prevent damage or permanent distortion. i C. Fabrication Tolerances: Fabricate assemblies level, plumb, and true to line to a maximum allowable tolerance variation of 1/8 inch in 10 feet and as follows: 3 PART 3 - EXECUTON 3.1 EXAMNATON 1. Spacing: Space individual framing members no more than plus or minus 1/8 inch from plan location. Cumulative error shall not exceed minimum fastening requirements of sheathing or other finishing materials Squareness: Fabricate each cold-formed metal framing assembly to a maximum outof-square tolerance of 1/8 inch. A. Examine supporting substrates and abutting structural framing for compliance with 3 requirements for installation tolerances and other conditions affecting performance. Proceed with installation only after unsatisfactory conditions have been corrected. U 3.2 PREPARATON A. Before sprayed fire-resistive materials are applied, attach continuous angles, i supplementary framing, or tracks to structural members indicated to receive sprayed fireresistive materials. 3 B. After applying sprayed fire-resistive materials, remove only as much of these materials as needed to complete installation of cold-formed framing without reducing thickness of fire-resistive materials below that are required to obtain fire-resistance rating indicated. Protect remaining fire-resistive materials from damage. C. Grout bearing surfaces uniform and level to ensure full contact of bearing flanges or track i webs on supporting concrete or masonry construction. COLD-FORMED METAL FRAMNG ,

11 5 SECTON COLD-FORMED METAL FRAMNG 3 of foundation wall or slab at stud or joist locations NSTALLATON, GENERAL D. nstall sealer gaskets to isolate the underside of wall bottom track or rim track and the top A. Cold-formed metal framing may be shop or field fabricated for installation, or it may be field assembled. B. nstall cold-formed metal framing according to ASTM C 1007, unless more stringent requirements are indicated. C. nstall shop- or field-fabricated, cold-formed framing and securely anchor to supporting structure Bolt or weld wall panels at horizontal and vertical junctures to produce flush, even, true-to-line joints with maximum variation in plane and true position between 5 fabricated panels not exceeding 1/16 inch. D. nstall cold-formed metal framing and accessories plumb, square, and true to line, and with connections securely fastened, according to manufacturer's written recommendations and requirements in this Section. 1. Cut framing members by sawing or shearing; do not torch cut. 2. Fasten cold-formed metal framing members by welding or screw fastening, as standard with fabricator. Wire tying of framing members is not permitted. a. Comply with AWS D1.3 requirements and procedures for welding, appearance and quality of welds, and methods used in correcting welding work. b. Locate mechanical fasteners and install according to Shop Drawings, with screw penetrating joined members by not less than three exposed screw threads. 3 E. nstall framing members in one-piece lengths, unless splice connections are indicated for track or tension members. F. nstall temporary bracing and supports to secure framing and support loads comparable in intensity to those for which structure was designed. Maintain braces and supports in place, undisturbed, until entire integrated supporting structure has been completed and 3 permanent connections to framing are secured. G. Do not bridge building expansion and control joints with cold-formed metal framing. 5 ndependently frame both sides of joints. H. nstall insulation in built-up exterior framing members, such as headers, sills, boxed joists, and multiple studs at openings, that are inaccessible on completion of framing work.. Fasten hole reinforcing plate over web penetrations that exceed size of manufacturer's 5 standard punched openings. COLD-FORMED METAL FRAMNG

12 SECTON COLD-FORMED METAL FRAMNG 3 J. Erection Tolerances: nstall cold-formed metal framing level, plumb, and true to line to a maximum allowable tolerance variation of 1/8 inch in 10 feet and as follows: 1. Space individual framing members no more than plus or minus 1/8 inch from plan location. Cumulative error shall not exceed minimum fastening requirements of sheathing or other finishing materials. 3.4 LOAD-BEARNG WALL NSTALLATON A. nstall continuous top and bottom tracks sized to match studs. Align tracks accurately and securely anchor at corners and ends, and at spacings as follows: 3 1. Anchor Spacing: As shown on drawings. B. Squarely seat studs against top and bottom tracks with gap not exceeding of 1/8 inch between the end of wall framing member and the web of track. Fasten both flanges of studs to top and bottom tracks. Space studs as follows: 3 1. Stud Spacing: 16 inches (Unless noted otherwise) C. Set studs plumb, except as needed for diagonal bracing or required for nonplumb walls or 3 warped surfaces and similar configurations. D. Align studs vertically where floor framing interrupts wall-framing continuity. Where studs cannot be aligned, continuously reinforce track to transfer loads. E. Align floor and roof framing over studs. Where framing cannot be aligned, continuously reinforce track to transfer loads. n F. Anchor studs abutting structural columns or walls, including masonry walls, to supporting structure as indicated. G. nstall headers over wall openings wider than stud spacing. Locate headers above openings as indicated. Fabricate headers of compound shapes indicated or required to transfer load to supporting studs, complete with clip-angle connectors, web stiffeners, or gusset plates.. Frame wall openings with not less than a double stud at each jamb of frame as indicated on Shop Drawings. Fasten jamb members together to uniformly distribute loads. 2. nstall runner tracks and jack studs above and below wall openings. Anchor tracks to jamb studs with clip angles or by welding, and space jack studs same as full-height wall studs. H. nstall supplementary framing, blocking, and bracing in stud framing indicated to support fixtures, equipment, services, casework, heavy trim, furnishings, and similar work requiring attachment to framing. COLD-FORMED METAL FRAMNG n C

13 5 SECTON COLD-FORMED METAL FRAMNG 1. f type of supplementary support is not indicated, comply with stud manufacturer's written recommendations and industry standards in each case, considering weight or load resulting from item supported.. nstall horizontal bridging in stud system, spaced 48 inches. Fasten at each stud intersection. 1. Bridging: Cold-rolled steel channel, welded or mechanically fastened to webs of punched studs with a minimum of 2 screws into each flange of the clip angle for framing members up to 6 inches deep. 2. Bridging: Combination of flat, taut, steel sheet straps of width and thickness 5indicated and stud-track solid blocking of width and thickness to match studs. Fasten flat straps to stud flanges and secure solid blocking to stud webs or flanges. 3. Bridging: Proprietary "BridgeBar BB150" wall bridging installed according to manufacturer's written instructions. J. nstall steel sheet diagonal bracing straps to both stud flanges, terminate at and fasten to reinforced top and bottom tracks. Fasten clip-angle connectors to multiple studs at ends of bracing and anchor to structure. K. nstall miscellaneous framing and connections, including supplementary framing, web stiffeners, clip angles, continuous angles, anchors, and fasteners, to provide a complete and stable wall-framing system. 3.5 EXTEROR NON-LOAD-BEARNG WALL NSTALLATON A. nstall continuous tracks sized to match studs. Align tracks accurately and securely anchor to supporting structure as indicated. B. Fasten both flanges of studs to top and bottom track, unless otherwise indicated. Space studs as follows: 31. Stud Spacing: 16 inches (Unless noted otherwise) C. Set studs plumb, except as needed for diagonal bracing or required for nonplumb walls or warped surfaces and similar requirements. D. solate non-load-bearing steel framing from building structure to prevent transfer of vertical loads while providing lateral support nstall single-leg deflection tracks and anchor to building structure. 2. nstall double deep-leg deflection tracks and anchor outer track to building structure. 3. Connect vertical deflection clips to bypassing studs and anchor to building structure. 4. Connect drift clips to cold formed metal framing and anchor to building structure. E. nstall horizontal bridging in curtain-wall studs, spaced in rows indicated on Shop Drawings but not more than 48 inches apart. Fasten at each stud intersection. 1. Top Bridging for Single Deflection Track: nstall row of horizontal bridging within 12 inches of single deflection track. nstall a combination of flat, taut, steel sheet 3 COLD-FORMED METAL FRAMNG

14 SECTON COLD-FORMED METAL FRAMNG3 straps of width and thickness indicated and stud or stud-track solid blocking of width and thickness matching studs. Fasten flat straps to stud flanges and secure solid blocking to stud webs or flanges. a. nstall solid blocking at 96-inch centers or as indicated on Shop Drawings. U 2. Bridging: Cold-rolled steel channel, welded or mechanically fastened to webs of punched studs. 3. Bridging: Combination of flat, taut, steel sheet straps of width and thickness indicated and stud-track solid blocking of width and thickness to match studs. Fasten flat straps to stud flanges and secure solid blocking to stud webs or flanges. 4. Bridging: Proprietary bridging bars installed according to manufacturer's written instructions. F. nstall miscellaneous framing and connections, including stud kickers, web stiffeners, clip angles, continuous angles, anchors, fasteners, and stud girts, to provide a complete and stable curtain-wall-framing system. 3.6 JOST NSTALLATON A. nstall perimeter joist track sized to match joists. Align and securely anchor or fasten 3 track to supporting structure at corners, ends, and spacings indicated on Shop Drawings. B. nstall joists bearing on supporting frame, level, straight, and plumb; adjust to final position, brace, and reinforce. Fasten joists to both flanges of joist track. 1. nstall joists over supporting frame with a minimum end bearing of 1-1/2 inches 2. Reinforce ends and bearing points of joists with web stiffeners, end clips, joist hangers, steel clip angles, or steel-stud sections as indicated on Shop Drawings. C. Space joists not more than 2 inches from abutting walls, and as follows: 5 1. Joist Spacing: As indicated on plan. D. Frame openings with built-up joist headers consisting of joist and joist track, nesting joists, or another combination of connected joists if indicated. E. nstall joist reinforcement at interior supports with single, short length of joist section located directly over interior support, with lapped joists of equal length to joist reinforcement, or as indicated on Shop Drawings nstall web stiffeners to transfer axial loads of walls above. F. nstall bridging at intervals indicated on Shop Drawings. Fasten bridging at each joist 3 intersection as follows: 1. Bridging: Joist-track solid blocking of width and thickness indicated, secured to joist webs. COLD-FORMED METAL FRAMNG

15 3 SECTON COLD-FORMED METAL FRAMNG 2. Bridging: Combination of flat, taut, steel sheet straps of width and thickness indicated and joist-track solid blocking of width and thickness indicated. Fasten flat straps to bottom flange of joists and secure solid blocking to joist webs. 3 G. Secure joists to load-bearing interior walls to prevent lateral movement of bottom flange. H. nstall miscellaneous joist framing and connections, including web stiffeners, closure pieces, clip angles, continuous angles, hold-down angles, anchors, and fasteners, to provide a complete and stable joist-framing assembly. * 3.7 TRUSS NSTALLATON A. nstall, bridge, and brace trusses according to Shop Drawings and requirements in this 3 Section. B. Truss Spacing: As indicated on plan. 3 C. Do not alter, cut, or remove framing members or connections of trusses. D. Erect trusses with plane of truss webs plumb and parallel to each other, align, and accurately position at spacings indicated. E. Erect trusses without damaging framing members or connections. F. Align webs of bottom chords and load-bearing studs or continuously reinforce track to transfer loads to structure. Anchor trusses securely at all bearing points. G. nstall continuous bridging and permanently brace trusses as indicated on Shop Drawings and designed according to LGSEA's Technical Note 55 le, "Design Guide for Permanent 5 Bracing of Cold-Formed Steel Trusses." 3.8 GYPSUM SHEATHNG NSTALLATON A. General: nstall gypsum sheathing to comply with GA-253 and manufacturer's written instructions. B. Cut boards at penetrations, edges, and other obstructions of the work; fit tightly against abutting construction, except provide a 3/8-inch setback where non-load-bearing 3 construction abuts structural elements. C. Coordinate sheathing installation with flashing and joint sealant installation so these materials are installed in the sequence and manner that prevent exterior moisture from passing through completed exterior wall assembly. D. Apply fasteners so screw heads bear tightly against face of sheathing boards but do not cut into facing. E. Do not bridge building expansion joints with sheathing; cut and space edges to match 5 spacing of structural support elements. COLD-FORMED METAL FRAMNG

16 SECTON COLD-FORMED METAL FRAMNG 3 F. Horizontal nstallation: nstall 24-inch- wide gypsum sheathing boards horizontally with V-grooved edge down and tongue edge up. nterlock tongue with groove to bring long edges in contact with edges of adjacent boards without forcing. Abut ends of boards over centers of stud flanges and stagger end joints of adjacent boards not less than one stud spacing. Screw-attach boards at perimeter and within field of board to each steel stud at approximately 8 inches o.c. and set back a minimum of 3/8 inch from edges and ends of i boards. G. Vertical nstallation: nstall 48-inch wide gypsum sheathing boards vertically with 3 vertical edges centered over flanges of steel studs. Abut ends and edges of each board with those of adjacent boards. Screw-attach boards at perimeter and within field of board to each steel stud at approximately 8 inches o.c. and set back a minimum of 3/8 inch from edges and ends of boards. H. Air-nfiltration Barrier Application: Cover sheathing with air-infiltration barrier as follows: 1. Cut back air-infiltration barrier 1/2 inch on each side of break in supporting members at expansion- or control-joint locations. 2. Apply asphalt-saturated organic felt horizontally with 2-inch overlap and 6-inch end lap; fasten to sheathing with corrosion-resistant staples. 3. Apply proprietary building wrap to comply with manufacturer's written installation instructions. 4. Apply air-infiltration barrier to cover vertical flashing with 4-inch overlap. Sealing Sheathing Joints: Seal joints according to sheathing manufacturer's written recommendations and as follows: 1. Apply elastomeric sealant on joints and fasteners and trowel flat. Apply sufficient i quantity of sealant to completely cover joints and fasteners after troweling. Seal other penetrations and openings. 2. Apply glass-fiber sheathing tape to glass-mat gypsum sheathing board joints, and apply and trowel silicone emulsion sealant to embed sealant in entire face of tape. Apply sealant to exposed fasteners with a trowel so fasteners are completely covered. Seal other penetrations and openings. 3.9 FELD QUALTY CONTROL 3 A. Testing: Owner will employ and pay for a qualified independent testing agency to perform field quality-control testing. 3 B. Field and shop welds will be subject to inspection and testing. C. Testing agency will report test results promptly and in writing to Contractor and 3 Architect. D. Remove and replace Work that does not comply with specified requirements. i U COLD-FORMED METAL FRAMNG

17 3 SECTON COLD-FORMED METAL FRAMNG E. Additional testing and inspecting will be performed to determine compliance of corrected Work with specified requirements. Contractor will reimburse Owner for the costs of the se additional tests REPARS AND PROTECTON A. Galvanizing Repairs: Prepare and repair damaged galvanized coatings on fabricated and installed cold-formed metal framing with galvanized repair paint according to ASTM A 780 and manufacturer's written instructions. B. Touchup Painting: Wire brush, clean, and paint scarred areas, welds, and rust spots oin fabricated and installed prime-painted, cold-formed metal framing. surfaces with same type of shop paint used on adjacent surfaces. Paint framing C. Protect paper-surfaced gypsum sheathing that will be exposed to weather for more than 30 days by covering exposed exterior surface of sheathing with a securely fastened airinfiltration barrier. Apply covering immediately after sheathing is installed. D. Protect cutouts, corners, and joints in sheathing by filling with a flexible sealant or by applying tape recommended by sheathing manufacturer at time sheathing is applied. E. Provide final protection and maintain conditions, in a manner acceptable to manufacturer and nstaller, that ensure cold-formed metal framing is without damage or deterioration at time of Substantial Completion. END OF SECTON C 3 COLD-FORMED METAL FRAMNG