Floor Joist Blocking And Bridging
Proper bridging distributes the load on the floor to other joists and over time prevents floors from sagging and squeaking do to floor joists twisting and warping.
Floor joist blocking and bridging. Bridging allows each joist to share weight with its neighbors and can cut deflectionhow much the joists flexby half. In addition to providing lateral support blocking helps transfer weight to adjacent joists so that the floor acts as a. Use metal bridging instead of wood blocking if you wish. Personally i prefer x bridging.
Blocking is fine too but i like the fact that x bridging is unaffected by cupped joists is much easier to get a tight connection and it actually tightens up as joists shrink. Is blocking required for floor joists. Using 2x lumber for floor joists i install blocking or bridging every 8. Blocking also needs to be provided at the supporting end of a joist.
Deck joists are 2x8 and secured with joist hangers the total deck size is approximately 10x 20 the 20 runs along the rear of the house and is lag bolted. Building code requires the use of blocking for floor joists that exceed 2 inches in width by 12 inches in depth. The catch of course is that the bouncy floor joists must be accessible from below. Floor joist bridging is critical to the structural strength of a floor as shown in figure 1.
Metal bridging is less effective for eliminating bouncy joists than blocking but it is easier to install and may stiffen the floor for. I need some advice regarding blocking or bridging to prevent the deck joists from racking. 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. Thats code around here.
Bracing will stiffen a floor system prevent floor joists from twisting and increase overall stabilityhowever there are actually two types of floor joist bracing commonly used. I use 1x3 pine with 2 medium crown staples to prevent splitting.
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