Figure 1-31.—Steps in framing a floor opening.solid blocks should be cut to fit between the joists havingof strength in the area of the opening. You need to framea common spacing. The distance between joists isthe opening in a way that restores this strength. Theusually 14 1/2 inches for joists spaced 16 inches OC.procedure is shown in figure 1-31. Refer to the figure asBlocking for the odd spaces is cut afterwards.you study the following steps:Framing Floor Openings1. Measure and mark the positions of the trimmersFloor openings, where stairs rise to the floor or largeon the outside wall and interior wall or girder.duct work passes through, require special framing.2. Position and fasten the inside trimmers and markWhen the joists are cut for such openings, there is a lossthe position of the double headers.1-15
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