Gambrel Roof Plywood Gussets

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.

Gambrel roof plywood gussets.

Plywood gussets could then be used to reinforce the joint if necessary. Nail gusset plates to the truss at all 3 connection spots with 8d common nails using 10 per connection 5 per each truss end. Nail on gusset plates. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon.

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. 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. 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. Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. With your first truss measuring out ok its time to cut and attach gusset plates. 10 23 2019 9 32 56 am.

Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area. If plywood is used the rule of thumb is 3 4 to match the thickness of the sandwiched rafter. Gambrel roof a gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof.