Girder Roof Structure

Girders are the main horizontal supports of a structure and support smaller beams.

Girder roof structure.

Buildings constructed in l or t shapes use girder truss systems where the roof changes direction. Understanding how a girder is different from a beam is a necessary skill for any builder engineer or constructionworker. These are often pre fabricated and sent to a construction site. Girders often have an i beam cross section composed of two load bearing flanges separated by a stabilizing web but may also have a box shape z shape or other forms.

All girders are beams but not all beams are girders. A girder truss is designed to support other secondary roof supports. A girder ˈɡɜːrdər is a support beam used in construction. Notches on the outer thirds must not exceed 1 6 of the width of the board.

Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. It is the main horizontal support of a structure which supports smaller beams. Girder is a type of roof truss or beam that is built stronger than a standard truss to support in construction. Their is no notching permitted in the center third of any beam.

See the figure below 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. Construction of a rafter roof a simple rafter roof consists of rafters that the rafter foot rest on horizontal wall plates on top of each wall. Here s a look at the fundamental differences between these two elements.