Girder Roof Structure

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

Girder roof structure.

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

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. 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. 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. 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.

It is the main horizontal support of a structure which supports smaller beams. These are often pre fabricated and sent to a construction site. Here s a look at the fundamental differences between these two elements. 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 ˈɡɜːrdər is a support beam used in construction. Buildings constructed in l or t shapes use girder truss systems where the roof changes direction. Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts.