I Joist Used As Roof Rafters

I joists make for a strong flat roof but you have to pay attention to the connections at the ridge and eaves.

I joist used as roof rafters.

There s no reason to used i joist with a 15 span. 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.

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. Insulation should be 1 inch from b vent. Can span over 18 for gable roofed shed.

Should not be cut like near the b vent. Just found this interesting. Trus joist tji s31 s33 and s47 joists for use in eastern canada. Use 2 6 rafters if your roof will experience heavy snow or wind loads.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. 6 8 sloped bearing conditions. 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.

When wood i joists are used as rafters connections at the structural ridge and the tops of exterior walls must be detailed properly. 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. These i joist rafters are on 24 inch 61 cm centers and support plywood roof sheathing and wood shingles. With an 8 soffit your rafter without a ridge deduction is roughly 20 4 3 4.

Shall be permitted to be used. Pdf says to consult with specific manufacturer for design installation specs. An spf rafter can span nearly 15 at the same dimensions. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

All you need is 22 2x10 s or 2x12 s. 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.