A gambrel roof is a popular roof style on many contemporary barns and sheds. gambrel roofs are symmetrical, with two slopes on each side of the roof. if you plan on building and installing your own gambrel roof, you�ll have to draw out plans first to determine the proper dimensions.. I�ve used a few different combination�s of gambrel roof angles and usually try to use the 60 degree on the lower section and a 22.5 degree on the top section and make the lower steeper rafter a little longer to get a little more height as needed and and still keep the building and roof in balance and proportion.. A gable roof has only two rafter or truss chord angles, a top cut at the peak and a bottom cut at the walls. a gambrel has four angles, at the peak, at the wall and where the two rafters or truss chords connect. there are three ways to calculate angles for gable trusses, which are rafters built with internal braces and installed as a unit..
Ensure that width of the truss is equal to shed width and that center of shed is directly beneath the truss peak. craft 4 additional trusses similarly using 20 degree rafters and assemble five trusses. now secure the 22.5 degrees rafter beneath the rafters with 20 degrees and finish building the gambrel slope of roof.. This step by step diy woodworking project is about 12
