Girder and Valley Truss System
Buildings with intersecting ridge lines can be framed as shown below. Valley trusses are
supported on top of the common trusses to form the intersecting ridge. If a clear span opening is
required where the roofs intersect, a girder truss can be used to support the valley trusses and
common trusses at the intersection. The girder trusses usually are specially made with heavier
chords and plates and can consist of a number of trusses laminated with nails or bolts.