I Joist Used As Roof Rafters

No solid sawn conventional lumber should be used as rim joist with i joist.

I joist used as roof rafters.

An spf rafter can span nearly 15 at the same dimensions. Can span over 18 for gable roofed shed. 6 8 sloped bearing conditions. Use 2 6 rafters if your roof will experience heavy snow or wind loads.

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. Syp 2 6 rafters at 24 o c. There s no reason to used i joist with a 15 span. I joists make for a strong flat roof but you have to pay attention to the connections at the ridge and eaves.

With an 8 soffit your rafter without a ridge deduction is roughly 20 4 3 4. Trus joist tji s31 s33 and s47 joists for use in eastern canada. Just found this interesting. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

These i joist rafters are on 24 inch 61 cm centers and support plywood roof sheathing and wood shingles. Photo 2 shows a view of the other ends of these same i joist rafters and the use of. 2 0 maximum cantilever roof truss span 2 0 maximum cantilever hip girder trusses truss roof trusses 13 0 maximum roof truss span. Looks like they can be used as rafters.

It is always better to have a large rafter rather than be concerned with a sagging roof. 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. Shall be permitted to be used. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Pdf says to consult with specific manufacturer for design installation specs. Again put them closer together if you want to achieve a greater span. They are ideal for long spans including continuous spans over intermediate supports. When wood i joists are used as rafters connections at the structural ridge and the tops of exterior walls must be detailed properly.

Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. I joists are used extensively in residential floor and roof framing. 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.