Girder Roof Construction

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.

Girder roof construction.

Based on the cross section shape beams are divided into i beam t beam and c beam. A girder is typically used to refer to a steel beam. Skip navigation sign in. In homes you ll find beams in walls floors ceilings roofs decks and garages.

A girder is commonly used to build bridges. Girder tr and roof work hiiii. Typically the roof beam is made by nailing together a few pieces of dimensional. These charts are for 30 pound per square foot snow load on the roof.

All other data is available on page 121 of the 2012 international residential code. The tables below give maximum spans for rafters and beams. Girder tr and roof work hiiii. Construction beams are horizontal weight bearing supports that bridge an area.

Functionality of beam vs. Span charts and 2012 irc building codes for girders and headers. It is the main horizontal support of a structure which supports smaller beams. A girder truss is designed to support other secondary roof supports.

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. You will need a roof beam as a nailing surface to support the rafters. Box girders are mainly used in construction of elevated bridges and roadway flyovers. These are often pre fabricated and sent to a construction site.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. I beam girders are the most common type of girders used in bridge construction. 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.

You may hear the words girder and beam used interchangeably but important differences distinguish the two from one another. Girders are the main horizontal supports of a structure and support smaller beams. The figures are based on quality materials. Understanding how a girder is different from a beam is a necessary skill for any builder engineer or construction worker.

Along with posts and columns which are the beams vertical counterparts they support the structural integrity of all sorts of buildings. Tiles tr girder roofing low cost roof making building construction site work duration.