Corner and Casing Beads

Figure 1-53.Wood blocking for celling or wall-mounted fixtures.

Ceiling Framing

Builder 3&2 Volume 02 - Construction manual for building structures
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Figure 1-57.—Expansion joint. (fig. 1-53). Friction-tight insulation is installed by placing the batts (bundles of insulating material) between the studs on the exterior walls. Studs are spaced 12, 16, or 24 inches OC as specified in the blueprints. Corner and Casing Beads Standard wallboard corner bead is manufactured from galvanized steel with perforated flanges, as shown in figure 1-54. It provides a protective reinforcement of straight corners. The corner bead is made with l-inch by 1-inch flanges for 3/8- or 1/2-jnch single- layer wallboard; 1 inch by 1 1/4 inches for 1/2-inch or 5/8-inch single-layer wallboard; 1 1/4 inches by 1 1/4 inches for two-layer wallboard application. It is available in 10-foot lengths. Multiflex tape bead consists of two continuous metal strips on the undersurface of 2 1/8-inch-wide reinforcing tape (fig. 1-55). This protects corners formed at any angle. Multiflex tape bead comes in 100-foot rolls. Casing and trim beads (examples are shown in fig. 1-56) are used as edge protection and trim around window and door openings and as moldings at ceiling angles. They are made from galvanized steel in three styles to fit 3/8-inch, 1/2-inch, and 5/8-inch wallboard and come in 10-foot lengths. Expansion Joints Expansion joints are vinyl extrusions used as control joints in drywall partitions and ceilings. A typical form is shown in figure 1-57. Figure 1-58 shows a typical metal frame layout and use of corner and casing beads for corners, partition intersections, and partition ends. It also shows a typical Figure 1-58.—Metal frame layout with various beads and joints. 1-33

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