Girder Floor Truss

Floor trusses are built with 2x4s or 2x3s with a wide stable bearing surface that is easier to work on and around.

Girder floor truss.

Sometimes a single ply girder truss is insufficient to carry the entire load so the truss designer specifies a multiple ply girder. 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. A truss is a roof or floor support structure built from a connected series of box or triangle shaped elements to distribute load to a building s walls or foundation. 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.

Geometry loading spacing bearing conditions etc. Floor truss span chart each individual floor truss design is unique based on multiple variables. 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. They have a top chord and a bottom chord separated by diagonal webs and vertical webs.

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. Floor trusses are not fire code friendly. When the 4x4 block length is extended this is referred to as mid chord bearing. This girder is made of similar trusses built and fastened together to act as one unit to support the load.

Truss a pre built component that functions as a structural support. These are often pre fabricated and sent to a construction site. Tcll 40 psf tcll 80 psf tcll 125 psf truss spacing truss spacing truss spacing. Girder trusses have a long straight design.

Forming the top of the floor truss. Span tables below illustrate common combinations of the multiple variables available. The top chord is always in compression and the bottom chord is always in tension. Girders are trusses specially designed to carry extra loads from framing and equip ment.