Floor Truss Bridging

Truss two runs for longer trusses.

Floor truss bridging.

The addition of this important structural component allow the individual. All open joist truss layout plans include strongback bridging specification and location. Floor joist bridging is critical to the structural strength of a floor as shown in figure 1. Support floor joists with a depth to thickness ratio of six or more with bridging at intervals not exceeding 8.

Tension bridging works only in tension so must be used in cross pairs. Strongback bridging system dampens floor vibrations. Floor truss is designed and produced to your specific needs and delivers reliable performance. I ve always used a lift for upper floors though.

If span is greater than 8 install on 2x8 or larger joists. The code does recognize load sharing through the value of cr. 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. 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. 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. Bridging allows each joist to share weight with its neighbors and can cut deflection how much the joists flex by half. The catch of course is that the bouncy floor joists must be accessible from below.

If span is greater than 16 use more than one pair. The load sharing element is typically considered to be the floor diaphragm. U section bridge under hung floor beam generally for shorter spans. 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.

Lay the new sheets perpendicular to the floor joists and orient panel ends over joists. Intervals one run for a 20 ft. 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.

Even if your floor already has a row of bridging running down the center you can stiffen it substantially by adding two more rows.