Roof Rafter Framing Details

Pitch rise run and diagonal.

Roof rafter framing details.

Roof features associated with basic roof framing terms are shown in figure 2 2. A collar tie is a horizontal roof rafter compression connector that is located in the uppermost third of the span of a pair of opposed sloped or gable roof rafters. If you have any two of those values the calculator will quickly figure out the rest of the right triangle which means it will tell you everything else you need to know about a rafter. The rafters carry the applied loads to the exterior walls.

Parts of a roof a ridge board is a horizontal member of the roof frame. Span is the horizontal distance between the outside. Cover some of the more common roof and rafter terms you ll need. The point at which all the rafters are attached to.

By upper third here we mean one third of the length of the rafter from ridge to top plate. Roof framing terms are related to the parts of a triangle. The function of each component is. Add the length of the overhang beyond this mark and.

Supported by lally columns. Rafters act more like the top chord of a roof truss than as a roof joist. Using a construction calculator. Ridge beam sits below the rafters.

Refer to the figure as you study the terms discussed in the next paragraphs. The values on the calculator that we use for common roof framing are. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Not shown are the hip and valley rafters needed to tie the roof together where the rafters are framed at an angle to each other.

Transfers the load of the roof through the raftersto walls below. In a rafter roof all of these components are required to provide a stable roof.