Cold Form Metal Framing Catalog - (Page 43) SPECIFICATIONS inch (1.85 mm) (nominal 14 ga) 5. Design Uncoated-Steel Thickness: 0.0970 inch (2.46 mm) (nominal 12 ga) C. Finish: Provide components with protective zinc coating complying with ASTM A653, minimum G60 coating. D. Fastenings: 1. Manufacturer recommended self-drilling screws with corrosion-resistant plated finish. Fasteners shall be of sufficient size and number to ensure the strength of the connection. 2. Welding: Comply with AWS D1.1 when applicable and AWS D1.3 for welding base metals less than 1/8” thick. 3. Other fasteners as accepted by truss engineer. 2.4 FABRICATION A. Factory fabricate cold-formed steel trusses plumb, square, true to line, and with connections securely fastened, according to manufacturer’s recommendations and the requirements of this Section. 1. Fabricate truss assemblies in jig templates. 2. Cut truss members by sawing or shearing or plasma cutting. 3. Fasten cold-formed steel truss members by screw fastening, or other methods as standard with fabricaor. a. Locate mechanical fasteners and install according to cold-formed steel truss component manufacturer’s instructions with screw penetrating joined members by not less than 3 exposed screw threads. B. Care shall be taken during handling, delivery and erection. Brace, block, or reinforce truss as necessary to minimize member and connection stresses. Refer to LGSEA “Field Installation Guide”. C. Fabrication Tolerances: Fabricate trusses to a maximum allowable tolerance variation from plumb, level, and true to line of 1/8 inch in 10 feet (1:960) and as follows: 1. Spacing: Space individual trusses no more than plus or minus 1/8 inch (3mm) from plan location. Cumulative error shall not exceed minimum fastening requirements of sheathing or other finishing materials. 2. Squareness: Fabricate each cold-formed steel truss to a maximum out-of-square tolerance of 1/8 inch (3mm). PART 3 EXECUTION 3.1 EXAMINATION A. Examine structure, substrates and installation conditions. Do not proceed with cold-formed steel truss installation until unsatisfactory conditions have been corrected. B. Installation constitutes acceptance of existing conditions and responsibility for satisfactory performance. 3.2 INSTALLATION, GENERAL B. Space trusses per sealed truss drawings. A. General: 1. Erection of trusses, including proper handling, safety precautions, installation bracing and other safeguards or procedures is the responsibility of the Contractor and Contractor’s installer. Refer to LGSEA “Field Installation Guide”. 2. Exercise care and provide installation bracing required to prevent toppling of trusses during erection. Provide Ultra-Span StabilizerTM from Aegis Metal Framing for lateral bracing. B. Erect trusses with plane of truss webs vertical and parallel to each other, accurately located at design spacing indicated. C. Provide proper lifting equipment, including spreader bar, suited to sizes and types of trusses required, applied at lift points recommended by truss fabricator. Exercise care to avoid damage to truss members during erection and to keep horizontal bending of the trusses to a minimum. D. Provide framing anchors as indicated or accepted on the engineering design drawing or erection drawings. Anchor trusses securely at bearing points. E. Install trusses plumb, square, true to line, and with connections securely fastened, according to manufacturer’s recommendations. 1. DO NOT cut truss members without prior approval of truss engineer. 2. Fasten cold-formed steel trusses by screw fastening, welding or other methods, as standard with fabricator. a. Comply with AWS 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 cold-formed truss manufacturer’s instructions with screw penetrating joined members by not less than 3 exposed screw threads. 3. Install trusses in one-piece lengths, unless splice connections are indicated. 4. Provide installation bracing and leave in place until trusses are permanently stabilized. F. Erection Tolerances: Install trusses to a maximum allowable tolerance variation from plumb, level, and true to line of 1/8 inch in 10 feet (1:960) and as follows: 1. Space individual trusses no more than plus or minus 1/8 inch (3 mm) from plan location. Cumulative error shall not exceed minimum fastening requirements of sheathing or other finishing materials. 2. Limit out-of-plane bow and plumb per LGSEA “Field Installation Guide”. C. Do not alter, cut, or remove truss members or connections of truss members. D. Erect trusses with plane of truss webs plumb and parallel to each other, align, and accurately position at spacing indicated. E. Erect trusses without damaging truss members or connections. F. Anchor trusses securely at all points of support, per installation documents provided for in Section 1.4 (D). G. Install all continuous bridging and permanent truss bracing per installation documents provided for in Section 1.4 (D). H. Perform all truss-to-truss connections per installation documents provided for in Section 1.4 (D). 3.4 OPEN WEB FLOOR TRUSS INSTALLATION A. Install perimeter joist track or belly band sized to match trusses. Align and securely anchor or fasten track to supporting structure at corners, ends, and spacing indicated or as recommended by the manufacturer. B. Install trusses bearing on supporting framing, level, straight, and plumb. 1. Install trusses over supporting framing with a minimum end bearing of 1-1/2 inches (38mm). C. Space trusses per sealed truss drawings. D. Frame openings with built-up joist headers consisting of joist and joist track, nesting joists, or another combination of connected joists where indicated. E. Install bridging and permanent bracing per installation documents provided for in Section 1.4 (D). F. Anchor trusses securely at all points of support per installation documents provided for in Section1.4 (D). 3.5 REPAIRS AND PROTECTION A. Galvanizing Repairs: Prepare and repair damaged galvanized coatings on fabricated and installed cold-formed steel framing with galvanizing repair paint according to ASTM A780 and the manufacturer’s instructions. 3.3 ROOF TRUSS INSTALLATION A. Install trusses per installation documents provided for in Section 1.4 (D). TRUSS SPECIFICATIONS Toll Free: 1.866.90.AEGIS . 314.851.2200 . FAX: 314.434.5234 www.aegismetalframing.com . Email: answers@aegismetalframing.com 43 http://www.aegismetalframing.com http://www.aegismetalframing.com
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