Roof Truss Bottom Chord Splice

Spacing the centerline to centerline distance between trusses.

Roof truss bottom chord splice.

It is utilized in a framed roof comprised of rafters and a ceiling joist. A bottom chord can be multiple pieces of lumber secured by a metal plate known as a splice either at a joint or mid panel. The bottom chord is intersected by the top chord and web members at various points throughout the truss creating a joint secured by metal connector plates. The joint configurations were 2x4 lumber with 20 gauge truss plates 2x6 lumber with 20 gauge truss plates and 2x6 lumber with 16 gauge truss plates.

The most common form by far is the fink illustrated below. Span the overall distance between adjacent interior supports or to the outside of supports when at the end of a truss. The horizontal beam of the triangle of a bottom chord is used in this simple triangle truss construction. Net section strength of bottom chord splice joints of mpc wood trusses.

Splices are located at points of low stress usually at about a fifth of the bay length middle bay bottom chord upper bay on the top chord. The stability of this shape supported by the bottom chord is the reason for the common usage of the triangle truss. See detail above splice point top bottom. Most trusses will require splices in the bottom chord and many in the top chord as well.