Girder Roof Construction

Skip navigation sign in.

Girder roof construction.

These are often pre fabricated and sent to a construction site. I beam girders are the most common type of girders used in bridge construction. Girder tr and roof work hiiii. 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.

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. Modern timber roofs are mostly framed with pairs of common rafters or prefabricated wooden trusses fastened together with truss connector plates timber framed and historic buildings may be framed with principal rafters or timber roof trusses roofs are also designated as warm or cold roof depending on how they are designed and built with regard to thermal building insulation and ventilation. Box girders are mainly used in construction of elevated bridges and roadway flyovers. A girder truss is designed to support other secondary roof supports.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. All other data is available on page 121 of the 2012 international residential code. Along with posts and columns which are the beams vertical counterparts they support the structural integrity of all sorts of buildings. A girder is commonly used to build bridges.

Span charts and 2012 irc building codes for girders and headers. The tables below give maximum spans for rafters and beams. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Functionality of beam vs.

In homes you ll find beams in walls floors ceilings roofs decks and garages. These charts are for 30 pound per square foot snow load on the roof. A girder ˈ ɡ ɜːr d ər is a support beam used in construction. Construction beams are horizontal weight bearing supports that bridge an area.

If you are building a one or two story home but may someday convert the attic to living space make sure your design will allow enough space for adequate roof insulation. Understanding how a girder is different from a beam is a necessary skill for any builder engineer or construction worker. Tiles tr girder roofing low cost roof making building construction site work duration. A girder is typically used to refer to a steel beam.

Girders are the main horizontal supports of a structure and support smaller beams. You may hear the words girder and beam used interchangeably but important differences distinguish the two from one another. Typically the roof beam is made by nailing together a few pieces of dimensional. It is the main horizontal support of a structure which supports smaller beams.

The figures are based on quality materials. You will need a roof beam as a nailing surface to support the rafters.