I Joist Used As Roof Rafters

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

I joist used as roof rafters.

Photo 2 shows a view of the other ends of these same i joist rafters and the use of. Should not be cut like near the b vent. They are ideal for long spans including continuous spans over intermediate supports. Again put them closer together if you want to achieve a greater span.

Software weyerhaeuser offers an array of software packages to help you specify individual framing members create cut lists manage inventories even to help you design a complete structural frame. Use 2 6 rafters if your roof will experience heavy snow or wind loads. 2 0 maximum cantilever roof truss span 2 0 maximum cantilever hip girder trusses truss roof trusses 13 0 maximum roof truss span. An spf rafter can span nearly 15 at the same dimensions.

Insulation should be 1 inch from b vent. 6 8 sloped bearing conditions. Trus joist tji s31 s33 and s47 joists for use in eastern canada. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface.

Shall be permitted to be used. I joists make for a strong flat roof but you have to pay attention to the connections at the ridge and eaves. Can span over 18 for gable roofed shed. When wood i joists are used as rafters connections at the structural ridge and the tops of exterior walls must be detailed properly.

Looks like they can be used as rafters. These i joist rafters are on 24 inch 61 cm centers and support plywood roof sheathing and wood shingles. 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. Syp 2 6 rafters at 24 o c.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. There s no reason to used i joist with a 15 span.

It is always better to have a large rafter rather than be concerned with a sagging roof. Just found this interesting. All you need is 22 2x10 s or 2x12 s.