The delivery adds to the overall project cost, but trusses are usually less expensive than rafters since they’re made in bulk. Additionally, they’re built off-site in a factory and then delivered to the job site. Trusses use compression and tension to provide strength and stability. The bottom of the rafters are connected by beams spanning the length of the room. Rather than laying rafter boards in the shape of an A-frame, a truss roof design looks like a web of support beams that criss-cross to better distribute the weight of the wood. trusses: What’s the difference?Īn alternative method for building a roof is using a truss system. These are curved at the top (and sometimes the bottom) and are usually used for ornamentation.Įven if you don’t regularly use each of these types of rafters in your projects, it’s helpful to be familiar with them on the rare occasion they’re needed. These rafters are located at the building’s inside corners at a 45-degree angle. These span from the building’s outside corners to the ridge board at a 45-degree angle. These are sometimes used to support a principal rafter. There are also some lesser-used rafters including: Together, they provide enough structural support to serve as the frame of the roof. Common rafters are smaller and placed in between the principal rafters. The principal rafters are the largest pieces used on each side of the roof structure. When building a rafter roof, you’ll typically find two common types used: principal and common rafters.
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