How To Cut Gambrel Roof Trusses

Draw a semi circle on the graph paper mark a center.

How to cut gambrel roof trusses.

Cut these strips into pieces 6in long. You will need to make 22 5 degree angle cuts on the rafter joist ends that mate up to the top plate or header. The gambrel spans 10 feet. Using this method it will take under an hour to cut all the 1x4 strips and gusset plates.

To cut them out cut along the lines with a circular saw in the same order you drew them. As you finish cutting each zigzag line the gusset will fall off exposing the next line. Starting the truss dimensions. 45 degrees where the joists meet up with the top plate or header and 90 where the joists meet in the middle at the ridge board.

Calculate gambrel angles with graph paper and a protractor. Finding the measurement for the mid line. How to build a gambrel style shed roof. You must also use glue construction adh.

Find a nice wide open flat surface such as your shed floor or a garage floor. Cut the longest lines first then the short perpendiculars then the zigzags. Determine a pitch for the top slope of the gambrel roof the rise in inches per foot from the midpoint. Cut osb web pieces.

Setting up the height of the truss. See table 3 for the truss count. Rip some osb into strips 12in wide and 8ft long. Since the sum of the three angles in a gambrel roof is 180 degrees the angles you will need are as follows.

How to calculate the angle of a gambrel roof truss step 1.