Girder Roof Structure

Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts.

Girder roof structure.

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. Their is no notching permitted in the center third of any beam. All girders are beams but not all beams are girders. 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. A girder truss is designed to support other secondary roof supports. Girder is a type of roof truss or beam that is built stronger than a standard truss to support in construction.

Notches on the outer thirds must not exceed 1 6 of the width of the board. It can bear the load extra loads imposed on it. 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.

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