I Joist Used As Roof Rafters

Pdf says to consult with specific manufacturer for design installation specs.

I joist used as roof rafters.

Use 2 6 rafters if your roof will experience heavy snow or wind loads. Again put them closer together if you want to achieve a greater span. An spf rafter can span nearly 15 at the same dimensions. Just found this interesting.

Photo 2 shows a view of the other ends of these same i joist rafters and the use of. No solid sawn conventional lumber should be used as rim joist with i joist. 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. These i joist rafters are on 24 inch 61 cm centers and support plywood roof sheathing and wood shingles.

Insulation should be 1 inch from b vent. When wood i joists are used as rafters connections at the structural ridge and the tops of exterior walls must be detailed properly. Shall be permitted to be used. Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

They are ideal for long spans including continuous spans over intermediate supports. 6 8 sloped bearing conditions. Can span over 18 for gable roofed shed. Looks like they can be used as rafters.

I joists are used extensively in residential floor and roof framing. 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. Syp 2 6 rafters at 24 o c. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface.

Trus joist tji s31 s33 and s47 joists for use in eastern canada. With an 8 soffit your rafter without a ridge deduction is roughly 20 4 3 4. There s no reason to used i joist with a 15 span. Should not be cut like near the b vent.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. All you need is 22 2x10 s or 2x12 s. It is always better to have a large rafter rather than be concerned with a sagging roof.