Gambrel Roof Plywood Gussets

If plywood is used the rule of thumb is 3 4 to match the thickness of the sandwiched rafter.

Gambrel roof plywood gussets.

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 on gusset plates. Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area. Nailed plywood gusset roof trusses author.

With your first truss measuring out ok its time to cut and attach gusset plates. Gambrel roof a gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof. For the gambrel truss we will need 6 total gusset plates made out of 1 2 material like osb or plywood. 10 23 2019 9 32 56 am.

Nail gusset plates to the truss at all 3 connection spots with 8d common nails using 10 per connection 5 per each truss end. Hardware is required at only three points as opposed to nine different joints in the roof assembly of a traditionally framed gambrel making the system considerably easier to build. 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. 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.

Keep in mind that i used a ridge beam not a ridge board which substantially reduces the load and outward thrust issue. Plywood gussets could then be used to reinforce the joint if necessary. The gussets top in the gambrel system above designed by the author create a three hinged arch out of each frame which simplifies the load analysis significantly.