Floor Joist Blocking And Bridging
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Use metal bridging instead of wood blocking if you wish.
Floor joist blocking and bridging. I joists are joists built with structural integrity however they still benefit from bridging which also helps reduce vibrations in the flooring. Various types of metal bridging are available at home centers and lumberyards. To install the type shown here drive the toothed end into the joist and nail the other end. 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.
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. Cross bracing and solid blocking. There are many different opinions on why to block floor joists the process behind doing it and how it helps the floor structure. The blocking or bridging between joists or rafters also contributes to this phenomenon.
It distributes the weight of a person walking onto multiple joists. The weight of the piano is centered over a single joist but the bridging transfers some of the weight to the adjacent joists. Floor joist bridging is critical to the structural strength of a floor as shown in figure 1. Blocking also needs to be provided at the supporting end of a joist.
Bridging ties the joists together with lumber. Adding two rows of bridging costs a few dollars per joist. Joist bridging is used in construction with long span lumber as a load sharing device. Metal bridging is less effective for eliminating bouncy joists than blocking but it is easier to install and may stiffen the floor for.
In addition to providing lateral support blocking helps transfer weight to adjacent joists so that the floor acts as a unified system. 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. I use 1x3 pine with 2 medium crown staples to prevent splitting. Blocking short pieces of 2x stock the same depth as the joists stops sideways deflection and ties the joists together so they can effectively share floor loads.
From both ends of the span. Tom installs a row of blocking in the joist bays at mid span whenever a span exceeds 9 feet.
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