Roof Truss Versus Rafter

In traditional timber they are nominally 2 inches thick and typically 8 to 10 inches wide.

Roof truss versus rafter.

Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. Though both rafters and trusses are triangles in shape the trusses have more triangle webs inside the principle frame. Trusses are gradually replacing the conventional rafters to the point that nowadays more than 80 percent of new residential construction uses trusses to support the roof. Roof truss basics roof trusses are engineered wood alternatives to hand framed rafters.

A typical home roof construction is composed of multiple trusses spaced out evenly over a span extending from one end of the house to the opposite end. If we go any larger it will require more webbing inside the truss which will directly affect the cost of the truss. Live loads are not always present. Rafters form the foundation for attachment of the roof boards onto which the final roof covering is fixed.

Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs. The same is true if we make it steeper. Roof framing has undergone a quiet revolution over the past half century. Rafters and trusses are those that support the roof.

Steeper roof pitches require longer webs which add to the cost. Expect to pay between 6 and 9 a square foot for rafter framing. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses. Throw in the element of a construction budget and this is where rubber meets the road.

Examples of live loads are snow wind rain and temporary construction loads. Stick framing is slightly more because of increased labor. Unlike stick built rafter construction that is done on site most trusses are made in a factory and delivered to the work site ready for installation. How much does roof framing cost.

In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. Rafters consist of sloping outer beams which provide support. Rafters are the building components that run diagonally from the wall plate to the apex of a roof structure. They support live and dead loads by efficiently transferring the loads to the building walls or supports.

This 26 span truss with a 4 12 roof pitch is the most economical truss we can build.