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. It is utilized in a framed roof comprised of rafters and a ceiling joist. The stability of this shape supported by the bottom chord is the reason for the common usage of the triangle truss. 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. 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.

Several common wood truss splice joint configurations were tested at varying levels of combined tension and bending loading. Net section strength of bottom chord splice joints of mpc wood trusses. Span the overall distance between adjacent interior supports or to the outside of supports when at the end of a truss. 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. Most trusses will require splices in the bottom chord and many in the top chord as well.