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Bridging between Joists

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Figure  1-25.—Joists  supported  by  S-beam  using  wooden  blocks. construction. Figure 1-25 shows the lapped (view A) and butt (view B) methods of framing over girders. Bridging between Joists Floor   plans   or   specifications   usually   call   for bridging between joists. Bridging holds the joists in line and helps distribute the load carried by the floor unit. It is usually required when the joist spans are more than 8 feet. Joists spanning between 8 and 15 feet need one row of bridging at the center of the span. For longer spans, two rows of bridging spaced 6 feet apart are required. CROSS   BRIDGING.—   Also   known   as herringbone  bridging,  cross  bridging  usually  consists  of 1- by 3-inch or 2- by 3-inch wood. It is installed as shown in figure 1-26. Cross bridging is toenailed at each Figure 1-26.—Wood cross bridging. end with 6d or 8d nails. Pieces are usually precut on a radial-arm saw. Nails are started at each end before the cross bridging is placed between the joists. The usual procedure is to fasten only the top end of the cross bridging. The nails at the bottom end are not driven in until the subfloor has been placed. Otherwise the joist could be pushed out of line when the bridging is nailed in. An  efficient  method  for  initial  placement  of  cross bridging is shown in figure 1-26. In step 1, snap a chalk line where the bridging is to be nailed between the joists. In step 2, moving in one direction, stagger and nail the 1-12



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