Figure 5-8.Dimpling of gypsum drywall.

Builder 3&2 Volume 02 - Construction manual for building structures
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Figure 5-8.—Dimpling of gypsum drywall. convex-headed drywall hammers are available for this operation, a conventional claw hammer also works (fig. 5-8). SECURING WITH SCREWS.— Because screws attach more securely, fewer are needed. Screws are usually spaced 12 inches OC regardless of drywall thickness. On walls, screws maybe placed 16 inches OC for greater economy, without loss of strength. Don’t double up screws except where the first screw seats poorly. Space screws around the edges the same as nails. SECURING WITH ADHESIVES.— Adhesive applied to wood studs allows you to bridge minor irregularities along the studs and to use about half the number of nails. When using adhesives, you can space the nails 12 inches apart (without doubling up). Don’t alter nail spacing along end seams, however. To attach sheets to studs, use a caulking gun and run a 3/8-inch bead down the middle of the stud. Where sheets meet over a framing member, run two parallel beads. Don’t make serpentine beads, as the adhesive could ooze out onto the drywall surface. If you are laminating a second sheet of drywall over a fret, roll a liquid contact cement with a short-snap roller on the face of the sheet already in place. To keep adhesive out of your eyes, wear goggles. When the adhesive turns dark (usually within 30 minutes), it is ready to receive the second piece of drywall. Screw on the second sheet as described above. CEILINGS.— Begin attaching sheets on the ceiling, first checking to be sure extra blocking (that will receive nails or screws) is in place above the top plates of the walls. By doing the ceiling first, you have maximum exposure of blocking to nail or screw into. If there are gaps along the intersection of the ceiling and wall, it is much easier to adjust wall pieces. Ceilings can be covered by one person using two tees made from 2 by 4s. This practice is acceptable when dealing with sheets that are 8 foot in length. Sheets over this length will require a third tee, which is very awkward for one individual to handle. Two people should be involved with the installation of drywall on ceilings. WALLS.— Walls are easier to hang than ceilings, and it’s something one person working alone can do effectively, although the job goes faster if two people work together. As you did with the ceiling, be sure the walls have sufficient blocking in corners before you begin. Make sure the first sheet on a wall is plumb and its leading edge is centered over a stud. Then, all you have to do is align successive sheets with the first sheet. The foot lift shown earlier in figure 5-2 is useful for raising or lowering a sheet while you level its edge. After you’ ve sunk two or three screws or nails, the sheet will stay in place. A gap of 1/2 inch or so along the bottom of a sheet is not critical; it is easily covered by finish flooring, baseboards, and soon. If you favor a clean, modem line without trim, manufactured metal or vinyl edges (casing beads) are available for finishing the edges. During renovation, you may find that hanging sheets horizontally makes sense. Because studs in older buildings often are not on regular centers, the joints of vertical sheets frequently do not align with the studs. Again, using the foot lift, level the top edge of the bottom sheet. Where studs are irregular, it’s even more important that you note positions and chalk line stud centers onto the drywall face before hanging the sheet. 5-8

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