Girder Roof Structure

These are often pre fabricated and sent to a construction site.

Girder roof structure. A girder ˈɡɜːrdər is a support beam used in construction. 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. Notches on the outer thirds must not exceed 1 6 of the width of the board. All girders are beams but not all beams are girders.

Girders are the main horizontal supports of a structure and support smaller beams. Buildings constructed in l or t shapes use girder truss systems where the roof changes direction. It can bear the load extra loads imposed on it. 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.

A girder truss is designed to support other secondary roof supports. Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. Girder is a type of roof truss or beam that is built stronger than a standard truss to support in construction. Understanding how a girder is different from a beam is a necessary skill for any builder engineer or constructionworker.

Here s a look at the fundamental differences between these two elements. 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. 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.