Floor Truss Bridging

Floor truss open concept allow the installation of strongback bridging which actively contribute to reduce floor vibration.

Floor truss bridging.

The code does recognize load sharing through the value of cr. Intervals one run for a 20 ft. Truss two runs for longer trusses. If span is greater than 8 install on 2x8 or larger joists.

U section bridge under hung floor beam generally for shorter spans. 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. 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. Bridging allows each joist to share weight with its neighbors and can cut deflection how much the joists flex by half.

Even if your floor already has a row of bridging running down the center you can stiffen it substantially by adding two more rows. Lay the new sheets perpendicular to the floor joists and orient panel ends over joists. Tension bridging works only in tension so must be used in cross pairs. All open joist truss layout plans include strongback bridging specification and location.

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. 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 is designed and produced to your specific needs and delivers reliable performance. Bottom of the floor joists instead of or in addition to being installed on top.

Floor joist bridging is critical to the structural strength of a floor as shown in figure 1. Strongback bridging system dampens floor vibrations. The catch of course is that the bouncy floor joists must be accessible from below. Support floor joists with a depth to thickness ratio of six or more with bridging at intervals not exceeding 8.

I ve always used a lift for upper floors though. The load sharing element is typically considered to be the floor diaphragm. The 2x6 serves the same purpose as bridging in a standard floor distributing concentrated loads over a wider area. If span is greater than 16 use more than one pair.

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.