I Joist Used As Roof Rafters

An spf rafter can span nearly 15 at the same dimensions.

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. Should not be cut like near the b vent. Photo 2 shows a view of the other ends of these same i joist rafters and the use of. Again put them closer together if you want to achieve a greater span.

Shall be permitted to be used. It is always better to have a large rafter rather than be concerned with a sagging roof. They are ideal for long spans including continuous spans over intermediate supports. 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.

2 0 maximum cantilever roof truss span 2 0 maximum cantilever hip girder trusses truss roof trusses 13 0 maximum roof truss span. With an 8 soffit your rafter without a ridge deduction is roughly 20 4 3 4. Syp 2 6 rafters at 24 o c. 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.

There s no reason to used i joist with a 15 span. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. When wood i joists are used as rafters connections at the structural ridge and the tops of exterior walls must be detailed properly.

All you need is 22 2x10 s or 2x12 s. Looks like they can be used as rafters. No solid sawn conventional lumber should be used as rim joist with i joist. 6 8 sloped bearing conditions.

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

Just found this interesting. Pdf says to consult with specific manufacturer for design installation specs. Insulation should be 1 inch from b vent.