Girder Roof Structure

It can bear the load extra loads imposed on it.

Girder roof structure.

Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. 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. Their is no notching permitted in the center third of any beam. Buildings constructed in l or t shapes use girder truss systems where the roof changes direction.

All girders are beams but not all beams are girders. 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. These are often pre fabricated and sent to a construction site. Girders are the main horizontal supports of a structure and support smaller beams.

Here s a look at the fundamental differences between these two elements. 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. Girder is a type of roof truss or beam that is built stronger than a standard truss to support in construction.

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 girder truss is designed to support other secondary roof supports. It is the main horizontal support of a structure which supports smaller beams.