Girder Roof Structure

All girders are beams but not all beams are girders.

Girder roof structure.

Buildings constructed in l or t shapes use girder truss systems where the roof changes direction. These are often pre fabricated and sent to a construction site. 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. 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.

It can bear the load extra loads imposed on it. Their is no notching permitted in the center third of any beam. 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. Here s a look at the fundamental differences between these two elements.

Notches on the outer thirds must not exceed 1 6 of the width of the board. 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. Understanding how a girder is different from a beam is a necessary skill for any builder engineer or constructionworker. A girder ˈɡɜːrdər is a support beam used in construction.

Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. Girders are the main horizontal supports of a structure and support smaller beams. Girder is a type of roof truss or beam that is built stronger than a standard truss to support in construction.