Girder Floor Truss

Girder trusses have a long straight design.

Girder floor truss.

Span tables below illustrate common combinations of the multiple variables available. 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. These are often pre fabricated and sent to a construction site. The top chord is always in compression and the bottom chord is always in tension.

Sometimes a single ply girder truss is insufficient to carry the entire load so the truss designer specifies a multiple ply girder. Floor trusses are built with 2x4s or 2x3s with a wide stable bearing surface that is easier to work on and around. Floor truss span chart each individual floor truss design is unique based on multiple variables. When the 4x4 block length is extended this is referred to as mid chord bearing.

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. Tcll 40 psf tcll 80 psf tcll 125 psf truss spacing truss spacing truss spacing. 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. 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.

Geometry loading spacing bearing conditions etc. In jurisdictions where recent versions of the irc fire code are enforced a protective membrane must be installed on the underside of plated truss floor framing. This girder is made of similar trusses built and fastened together to act as one unit to support the load. Forming the top of the floor truss.

Truss a pre built component that functions as a structural support. Repairs are costly and time consuming. They have a top chord and a bottom chord separated by diagonal webs and vertical webs. Floor trusses are not fire code friendly.