How To Install Floor Joist Cross Bracing
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To install the type shown here drive the toothed end into the joist and nail the other end.
How to install floor joist cross bracing. Bracing will stiffen a floor system prevent floor joists from twisting and increase overall stability however there are actually two types of floor joist bracing commonly used. On top of the floor joists is the subfloor which is typically a sheer or sheets of plywood. You will have the floor joists which cross one another to form a grid. On top of that will be your main floor.
As shown in figure 2 it is not unusual especially in new homes to find that the cross bridging has not been nailed to the bottom of the floor joists. When you reach the underside of the floor you will be able to see several things. Bridging or x bracing allows joists to share weight. It is installed as shown in figure 1 26.
End with 6d or 8d nails. Cross bracing and solid blocking. Nails are started at each end before the cross bridging is placed between the joists. Even if your joists already have a row of bridging at the center of the span adding a row on each side of the existing bridging will stiffen the floor.
The usual procedure is to fasten only the top end of the cross bridging. Bridging is removed to allow for the installation of duct work as shown in figure 3 dryer vent pipes plumbing drains water pipes and. Cross bridging is toenailed at each figure 1 26 wood cross bridging. Measure the joist spacing before you go shopping.
Bridging is sized for joists centered 16 in. Residential building code requires the use of cross bracing or blocking for floor joists exceeding 2 inches by 12 inches but many homes especially older ones have. Outside joists may not be spaced at 16 oc or may need to adjust to get the proper fit for decking. Step 2 sagging floor joists.
Whether your home is new or old it is sometimes necessary to install floor joist bracing in order to eliminate squeaking and deflection in the flooring itself. As a footstep falls on one joist some of the force is transferred to neighboring joists. On a low deck where blocking cannot be installed from underneath stretch a string from the house to the outside edge along each outside joint for a reference. Figure 2 incorrect installation of cross bridging.
Leave outside joists for last and install blocking from underneath. Mike installs galvanized steel briding in between the floor joists on this bedroom addition project in rocky hill ct. Adding two rows of bridging costs a few dollars per joist.
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