ASTM C754-15 pdf download.Standard Specification for Installation of Steel Framing Members to Receive Screw- Attached Gypsum Panel Products.
5. Installation of Metal Framing
5.1 Tolerances:
5.1.1 Spacing of studs and furring members shall be not more than 6 1 ⁄ 8 in. (3 mm) from the spacing shown in Tables 1 and 2. Any cumulative error shall be not more than 6 1 ⁄ 8 in.
5.2 Runner (Track) Installation:
5.2.1 General—Runners shall be aligned accurately at the floor and ceiling and securely anchored approximately 2 in. (50 mm) from the runner ends, not more than 24 in. (610 mm) on center. Runners shall be secured with fasteners at partition corners. One runner shall extend to the end of the corner and the other runner shall butt to it and be gapped to allow clearance for the gypsum panel product thickness. Runners shall not be mitered.
5.2.2 Runners to Concrete Slabs—Shall be fastened with concrete stub nails, expansion anchors, shielded screws, or power-driven fasteners not exceeding 24 in. (610 mm) on center.
5.2.3 Runners to Wood—Shall be fastened with screws providing not less than 1 in. (25 mm) penetration or nails providing 1 1 ⁄ 2 in. (38 mm) penetration into the wood.
5.2.4 Runners to Suspended Ceilings—Shall be fastened with “Molly”-type expandable fasteners, toggle bolts, clamps, or screws into channels, splines, “T” runners, or other members.
5.3 Stud Installation:
5.3.1 Stud Height and Spacing Limitations: 5
.3.1.1 Maximum framing spacing determined by gypsum panel product thickness shall be in accordance with Table 1.
5.3.1.2 Stud heights shall be not greater than those shown in Tables 3-5.
5.3.1.3 Studs shall engage both the floor and ceiling run- ners. The gap between the end of a stud and the web of the top and bottom runner shall be not more than 1 ⁄ 4 in. (6 mm).
5.3.1.4 Where conditions require that a partition be con- structed with compensation for vertical structural movement, the gap between the end of a stud and the adjacent runner shall be designed by an architect or engineer.
5.3.2 Location:
5.3.2.1 Studs shall be positioned vertically and shall be spaced not more than the maximum framing spacing allowed for the finish specified. Studs located adjacent to door and window frames, partition intersections, and corners shall be anchored to runner flanges by screws, or by crimping at each stud and runner flange.
5.3.2.2 At the junction of through and abutting partitions, a stud shall be located not more than 2 in. (50 mm) away from the intersection in the abutting partition from the through partition (see Fig. 1), and not more than 2 in. (50 mm) from partition corners and other construction. A stud shall be located adjacent to all door and borrowed light frames. Studs shall be securely anchored to the jamb anchor clips on each door frame or borrowed light frame by bolt or screw attachment. A header shall be formed over metal door and borrowed light frames with a cut-to-length section of runner placed horizontally with the flanges cut and web bent vertically at each end, and securely attached to the adjacent vertical studs. A cut-to-length stud shall be positioned at the location of vertical joints over the header extending to the ceiling runner. Additional cut to length studs required to comply with framing spacing in accordance with Table 1 shall also be added over the header, extending to the ceiling runner.
5.3.2.3 At partition corners, a stud shall be installed so that it forms the outside corner. Following application of a single layer of gypsum panel product to this stud, a second stud shall be installed in the abutting runner and the web shall be screw-attached through the gypsum panel product into the flange of the first stud (see Fig. 2). A three-stud conventional corner shall be permitted (see Fig. 3).
5.4 Chase Wall Partitions: 5.4.1 A double row of runners and studs as specified in 5.2 and 5.3 shall be installed. Height shall be in accordance with 5.3.1.2.
5.4.2 Where a gypsum panel product is used as bracing between chase walls, a gap of not more than 20 in. (508 mm) between rows of studs shall be permitted.
5.4.3 Horizontal cross braces to opposite studs shall be installed not more than 4 ft (1220 mm) on center vertically. Horizontal cross braces shall be either of the following: 5.4.3.1 Gypsum panel product gussets 12 in. (305 mm) deep attached to the stud webs with three screws.ASTM C754 pdf download.