Floor Truss Bridging

Tension bridging works only in tension so must be used in cross pairs.

Floor truss bridging.

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. Strongback bridging system dampens floor vibrations. The load sharing element is typically considered to be the floor diaphragm. The catch of course is that the bouncy floor joists must be accessible from below.

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. Bottom of the floor joists instead of or in addition to being installed on top. Intervals one run for a 20 ft. 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 truss open concept allow the installation of strongback bridging which actively contribute to reduce floor vibration. Underneath 2x6 strongbacks laid on edge should run continuously through the webs of all the trusses at 10 ft. All open joist truss layout plans include strongback bridging specification and location. If span is greater than 16 use more than one pair.

U section bridge under hung floor beam generally for shorter spans. Floor truss is designed and produced to your specific needs and delivers reliable performance. If span is greater than 8 install on 2x8 or larger joists. I ve always used a lift for upper floors though.

Even if your floor already has a row of bridging running down the center you can stiffen it substantially by adding two more rows. 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. The addition of this important structural component allow the individual. Bridging allows each joist to share weight with its neighbors and can cut deflection how much the joists flex by half.

Truss two runs for longer 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. Support floor joists with a depth to thickness ratio of six or more with bridging at intervals not exceeding 8.

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.