Floor Truss Bridging

Floor joist bridging vs blocking i like laying 1 1 8 super flat easy to pound t g together dropping a 2x6 from a floor above doesn t put a hole in it.

Floor truss bridging.

The load sharing element is typically considered to be the floor diaphragm. Strongback bridging system dampens floor vibrations. Tension bridging works only in tension so must be used in cross pairs. Bridging allows each joist to share weight with its neighbors and can cut deflection how much the joists flex by half.

Details to minimize the chance of future squeaks and to help secure the new floor sheath ing start by spreading a generous amount of construction adhesive over the old planks. Bottom of the floor joists instead of or in addition to being installed on top. Underneath 2x6 strongbacks laid on edge should run continuously through the webs of all the trusses at 10 ft. Floor truss is designed and produced to your specific needs and delivers reliable performance.

If span is greater than 16 use more than one pair. If span is greater than 8 install on 2x8 or larger joists. Pony or pratt truss bridges are half through truss bridges no overhead members box or full through truss overhead members two types of pony truss configurations. Floor truss open concept allow the installation of strongback bridging which actively contribute to reduce floor vibration.

The code does recognize load sharing through the value of cr. Intervals one run for a 20 ft. All open joist truss layout plans include strongback bridging specification and location. Ansi tpi 1 2002 includes information in the commentary to section 7 5 2 4 regarding the use of strongback bridging to reduce the effects of differential deflection in floor trusses.

Floor joist bridging is critical to the structural strength of a floor as shown in figure 1. The 2x6 serves the same purpose as bridging in a standard floor distributing concentrated loads over a wider area. I ve always used a lift for upper floors though. However some people add additional bridging to try and stiffen the floor and provide additional load sharing or to brace the joists per nds 4 4 1.

Truss two runs for longer trusses. 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. Even if your floor already has a row of bridging running down the center you can stiffen it substantially by adding two more rows. The catch of course is that the bouncy floor joists must be accessible from below.

U section bridge under hung floor beam generally for shorter spans.