Gambrel Roof Plywood Gussets

Start with the top corners of the roof first.

Gambrel roof plywood gussets.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. The gusset system relies on a pair of 3 4 inch fir plywood gussets at each joint with the rafters sandwiched in the center. The gambrel spans 10 feet. Plywood gussets could then be used to reinforce the joint if necessary.

Place the osb or plywood on the top portion of the rafters and make sure that the edges run flush. 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. Nail gusset plates to the truss at all 3 connection spots with 8d common nails using 10 per connection 5 per each truss end. 10 23 2019 9 32 56 am.

As long as the joint is adequately nailed the assembly acts as a single unit and is equivalent to a continuous sawn lumber rafter. For the gambrel truss we will need 6 total gusset plates made out of 1 2 material like osb or plywood. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. 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. If plywood is used the rule of thumb is 3 4 to match the thickness of the sandwiched rafter. With your first truss measuring out ok its time to cut and attach gusset plates. Using this method it will take under an hour to cut all the 1x4 strips and gusset plates.

Nailed plywood gusset roof trusses author. Nail on gusset plates. Nail osb or plywood onto the rafters to enclose the roof. You must also use glue construction adh.

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 along the edges of the osb or plywood driving the nails into the rafters every 8 inches 20 cm with 8d common nails.