Girder Roof Structure

All girders are beams but not all beams are girders.

Girder roof structure. Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. These are often pre fabricated and sent to a construction site. Buildings constructed in l or t shapes use girder truss systems where the roof changes direction. A girder ˈɡɜːrdər is a support beam used in construction.

It is the main horizontal support of a structure which supports smaller beams. The top ends of the rafters often meet at a ridge beam but may butt directly to another rafter to form a pair of rafters called a couple. Understanding how a girder is different from a beam is a necessary skill for any builder engineer or constructionworker. 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. Girders are the main horizontal supports of a structure and support smaller beams. 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.

It can bear the load extra loads imposed on it. A girder truss is designed to support other secondary roof supports. Notches on the outer thirds must not exceed 1 6 of the width of the board.