Gambrel Roof Plywood Gussets

Nail on gusset plates.

Gambrel roof plywood gussets.

Place the osb or plywood on the top portion of the rafters and make sure that the edges run flush. Nail osb or plywood onto the rafters to enclose the roof. The gusset system relies on a pair of 3 4 inch fir plywood gussets at each joint with the rafters sandwiched in the center. You must also use glue construction adh.

You might want to read through this thread as well gambrel roof. Used a gambrel roof using plywood gussets used 3 4 so the two sides match the rafter thickness and did not cut them full triangles. Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. With that said when designing gambrel roof it s very important to consider wind load and other load factors because of the odd angled shape and not having ceiling collar ties you have increased chance for rafter movement under wl ll and dl so the gussets must be sized correctly if not your roof.

Taken together the plywood pieces have the same thickness as the rafters themselves. 10 23 2019 9 32 56 am. Raised custom gambrel only the raised joint supports the upper rafters on walls with the lower rafters butted against wall studs. As long as the joint is adequately nailed the assembly acts as a single unit and is equivalent to a continuous sawn lumber rafter.

Using this method it will take under an hour to cut all the 1x4 strips and gusset plates. For the gambrel truss we will need 6 total gusset plates made out of 1 2 material like osb or plywood. Nail along the edges of the osb or plywood driving the nails into the rafters every 8 inches 20 cm with 8d common nails. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon.

Nail gusset plates to the truss at all 3 connection spots with 8d common nails using 10 per connection 5 per each truss end. Start with the top corners of the roof first. Nailed plywood gusset roof trusses author. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape.

Keep in mind that i used a ridge beam not a ridge board which substantially reduces the load and outward thrust issue. If plywood is used the rule of thumb is 3 4 to match the thickness of the sandwiched rafter.