Roof Truss Bottom Chord Splice

Net section strength of bottom chord splice joints of mpc wood trusses.

Roof truss bottom chord splice.

The most common form by far is the fink illustrated below. 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. 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. Most trusses will require splices in the bottom chord and many in the top chord as well.

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. Several common wood truss splice joint configurations were tested at varying levels of combined tension and bending loading. The horizontal beam of the triangle of a bottom chord is used in this simple triangle truss construction. It is utilized in a framed roof comprised of rafters and a ceiling joist.

See detail above splice point top bottom. 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 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.

Truss or roof framing showing critical dimensions such as span overhang cantilever slope etc.