Girder Floor Truss

Floor truss span chart each individual floor truss design is unique based on multiple variables.

Girder floor truss.

A girder truss is designed to support other secondary roof supports. Girder trusses have a long straight design. Top chord bearinga floor truss support condition in which the truss load is transferred to the bearing or support through the top chord and 4x4 block end detail. Tcll 40 psf tcll 80 psf tcll 125 psf truss spacing truss spacing truss spacing.

Floor trusses are built with 2x4s or 2x3s with a wide stable bearing surface that is easier to work on and around. This girder is made of similar trusses built and fastened together to act as one unit to support the load. Repairs are costly and time consuming. Geometry loading spacing bearing conditions etc.

These are often pre fabricated and sent to a construction site. To strengthen a truss the fabricator may double its top and bottom chords make side by side girder trusses use larger truss plates or stronger wood or use some combination of these techniques. Required for girder floor trusses slope for drainage as required cantilever span controlled by lumber size grade and deflection limitations floor cantilevered perpendicular to floor truss span section aa floor truss jacks floor joist scab cantilever floor cantilevered perpendicular and parallel to floor truss span strongback lateral supports. Girders are trusses specially designed to carry extra loads from framing and equip ment.

They have a top chord and a bottom chord separated by diagonal webs and vertical webs. Span tables below illustrate common combinations of the multiple variables available. Forming the top of the floor truss. Floor trusses are not fire code friendly.

The top chord is always in compression and the bottom chord is always in tension. The wide nailing surface provides for easy gluing and quick accurate attachment of sheathing reducing squeaks and improving floor performance for the life of the structure. Sometimes a single ply girder truss is insufficient to carry the entire load so the truss designer specifies a multiple ply girder. When the 4x4 block length is extended this is referred to as mid chord bearing.