I Joist Shed Roof

The crew frames a long span shed roof using 16 inch deep wood i joists and steel hangers.

I joist shed roof.

For hip roofs with the hip trusses running parallel to the cantilevered floor joists the i joist reinforcement requirements for a span of 26 ft. It offers many benefits including water shedding and cost effectiveness but it also comes with cons including ceiling height issues and susceptibility to high wind. 2 0 maximum cantilever roof truss span 2 0 maximum cantilever hip girder trusses truss roof trusses 13 0 maximum roof truss span. Sometimes joists are notched at the end where they bear on a wall or sill.

They are ideal for long spans including continuous spans over intermediate supports. Front elevation architect erik sokol s drawing shows the long shed roof at the left of the building as viewed from the street. When comparing roof types you see a lot of gable and hip roofs but a contemporary option with a simple design is a shed roof. 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.

We chose i joists to frame our roof out because they can span long distances without intermediate supports. If the cut outs are too large or in the wrong location the joist can be weakened and unable to support the load it was designed for. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. These joists may need reinforcin g to reduce bounciness sagging or excessive deflection in the floor or ceiling.

The bottom half is carried by the exterior bearing walls. I joists are used extensively in residential floor and roof framing.