Main frame is 40'x28' 8x8,posts and beams,with knee braces.2-8x8 rafter ties at the wall plates,spaced at 12' from each end of frame.Roof design thus far is a 12/12 common rafter gable,with no ridge board or beam.Rafters are 4x6- 20' in length and have 4x6 collar ties at the 10'mark.Build up will be:Rafters,1x6 t&g pine,vapour bar.,2x8 on end over rafters to box in 6 1/2" rigid ins.1x strapping,metal roof.My concerns are:with no beam or purlins are the ceiling boards enough to hold the roof laterally?(gable to gable)Perhaps 2x for the ceiling boards?We are using mostly plate joinery.Can any one suggest the best way to connect rafter to the wall plate?(rafter end stops at the plate,with an extension added later for overhang)
Any insight would be helpful Thanks