Plumb cut this rafter cut is at the top of the roof where the rafter contacts the ridge board. heel or seat cut this cut on the rafter is at the bottom and is designed to sit flat on top of the exterior wall. building rafters this picture shows the alignment for a 7 / 12 pitch cut.. Pole barn trusses. each do-it-yourself pole barn kit sold by diy pole barns includes wood pole barn trusses � ranging anywhere from 12 feet to 40 feet wide, depending on the structure.. Most of the barn roofs these days are either built with rafters or trusses. roof rafters might be a little harder to set up, compaered to trusses, but offer much more flexibilty to construct any style or shape of loft desired..
