Roof Truss Bottom Chord Splice

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.

Roof truss bottom chord splice.

The horizontal beam of the triangle of a bottom chord is used in this simple triangle truss construction. 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. Typical triangular trusses parts of a truss panel length peak continuous la teral brace 12 slope pitch tru s pl te top chord heel bottom chord bearing point splice panel point w edg block span out to out of bearings cantilever overhang bottom chord length web double cantilever common trusses their spans king post span up to 16 queen. Net section strength of bottom chord splice joints of mpc wood trusses.

It is utilized in a framed roof comprised of rafters and a ceiling joist. 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. Spacing the centerline to centerline distance between trusses. The most common form by far is the fink illustrated below.

Truss or roof framing showing critical dimensions such as span overhang cantilever slope etc. See detail above splice point top bottom. 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. A triangle is the simplest form of a truss and the bottom chord is the base piece.

Most trusses will require splices in the bottom chord and many in the top chord as well.