I Beam Roof Framing

I joists are used extensively in residential floor and roof framing.

I beam roof framing.

The table below shows built up beams for 31 3 psf of snow loading. Instead a wood i joist roof system is framed with either a central bearing wall or a structural ridge a beam that carries the roof load to posts. The bottom half is carried by the exterior bearing walls. Sample maximum roof beam span table feet inches.

There are two common ways of framing the roof of a house. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. They are ideal for long spans including continuous spans over intermediate supports. Typically the roof beam is made by nailing together a few pieces of dimensional lumber.

The load from the top half of the roof is carried by the bearing wall or structural ridge. While truss roofs are the most popular construction style today by some estimates truss roofs outnumber stick frame roofs two to one there are regions of the country where builders. Once again you will need to look at your local charts and use your local snow load factor to determine the maximum span for a given wood rafter size. If you know the slope x in 12 you want to use for your roof framing design you can use it along with the run r to determine the height of the ridge beam.

With premanufactured trusses or with rafters and ceiling joists commonly called stick framing.