In simple terms, I can define a gambrel roof truss as a sloping truss with two portions; the upper portion and the lower portion. The upper portion has a shallow slope while the lower portion’s slope is steeper. This truss mostly provides maximum space in the building and that is why it is preferred by many people. Besides, a gambrel roof design will give your building a unique look.
Designing a gambrel roof truss is very easy. All you have to do is to know the resources required for the design and construction of the gambrel roof truss for your house, shed or garage.
The gambrel roof trusses are related to the ancient buildings decades ago mainly in America. Remember a gambrel roof truss is symmetrical with double sides with double slopes on each side. Therefore, let’s learn how to construct a gambrel roof truss.
See also: How to Build a Gambrel roof
Determine the number of trusses that will be required for the whole building. Determine the size of the building. Then one truss will be placed at each end of the roof and the rest placed in between at 16 inches from one truss to another
Determine the height of the roof:
Know that the truss can be of any height but in most cases, the angle of the upper portion is maintained at 30 degrees. On the other hand, the lower section of the roof is recommended to be 60 degrees
Prepare the materials for the trusses:
use 2-inch by 6-inch lumber, lay down the four boards on a flat surface. Use a protractor to adjust the boards on top of each other so as to ensure that the angles are as per the design; 30 degrees on the upper portion and 60 degrees on the lower portion. The boards should be held in place with stakes driven on their either sides. When they are in place, mark the angles needed to be cut, using a chalk-line
Cut the boards:
you can use a circular saw to cut both the lengths of the boards and the angles. The first four boards are enough for the entire truss because the truss is symmetrical
Cut plywood for brackets:
put three pieces of cardboard on the ground and then lay the cut boards on top of the cardboard. Trace the inside and outside of the bends of the trusses. Use another cardboard for the upper portion of the truss. Once traced onto the plywood, cut out the shapes.
Assemble the trusses:
place the boards back between the stakes; attach the pieces of plywood to the sides of the trusses with the appropriate inches of nails. Then attach the triangle brackets to the top of the truss to join the two sides of the truss
Reinforce the side support brackets:
this is supposed to match the same angles as the side angles of the truss. Make sure that there is enough for each bend in the truss. Secure these to the trusses, with appropriate size of the nails, so as to reinforce the bends in the trusses.
Thereafter, your truss will be ready to be fixed on the roof. Basically, that is how simple it is to construct gambrel roof trusses. Accuracy is what you should consider most.