For 2 x 4 rafters use a 2 x 6 ridge board.
Gambrel roof with ridge beam.
The common rafters are often smaller than the truss timbers to differentiate between the primary and secondary timber frame elements.
These simple but elegant gambrel roof structures have been popular on hay barns for many years.
Peculiarities of gambrel roof constructing to frame a gambrel roof that is to meet all requirements of reliability and durability you should observe following conditions.
A timber frame truss roof with ridge beams and common rafters can provide a larger space between each truss.
That a conventional barn sized gambrel is a nightmare of purlin beams ridge beams and dovetail.
Choose a ridge board that is one size larger than your common rafters.
The ridge itself has got an undercut with a double slant for fastening of angled elements.
Area under roof the same gross areawas taken forboth roofs.
Bothwere roof shapes stable underallcustomary dead loads for34 foot bams.
Gambrel roof trusses on one side have an oblique cut for attachment to the ridge beam.
Come to think of it the only style shed i can see that would be easy to use a ridge beam is the gable style shed.
The standard gambrel using a combination of14and 12 foot raf tersections.
I can t ever recall seeing a saltbox shed built with a ridge beam or even a gambrel roof shed for that matter.
Figure 4 givesthe dimensions for the roofs.
For 2 x 6 rafters use a 2 x 8 ridge board and so on.
The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends.