Gambrel Roof Plywood Gussets

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 plywood gussets.

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. The gambrel spans 10 feet. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. The gusset system relies on a pair of 3 4 inch fir plywood gussets at each joint with the rafters sandwiched in the center.

Taken together the plywood pieces have the same thickness as the rafters themselves. Raised custom gambrel only the raised joint supports the upper rafters on walls with the lower rafters butted against wall studs. If plywood is used the rule of thumb is 3 4 to match the thickness of the sandwiched rafter. Nail on gusset plates.

Plywood gussets could then be used to reinforce the joint if necessary. Start with the top corners of the roof first. 10 23 2019 9 32 56 am. You might want to read through this thread as well gambrel roof.

As long as the joint is adequately nailed the assembly acts as a single unit and is equivalent to a continuous sawn lumber rafter. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. For the gambrel truss we will need 6 total gusset plates made out of 1 2 material like osb or plywood. Place the osb or plywood on the top portion of the rafters and make sure that the edges run flush.

Nail gusset plates to the truss at all 3 connection spots with 8d common nails using 10 per connection 5 per each truss end. You must also use glue construction adh. 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. Keep in mind that i used a ridge beam not a ridge board which substantially reduces the load and outward thrust issue.

With your first truss measuring out ok its time to cut and attach gusset plates. Nailed plywood gusset roof trusses author.