Roof Rafter Framing Details

Transfers the load of the roof through the raftersto walls below.

Roof rafter framing details.

Roof framing terms are related to the parts of a triangle. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Joists and collar ties. 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. In a rafter roof all of these components are required to provide a stable roof. The values on the calculator that we use for common roof framing are. Parts of a roof a ridge board is a horizontal member of the roof frame.

Ridge beam sits below the rafters. Add the length of the overhang beyond this mark and. Roof features associated with basic roof framing terms are shown in figure 2 2. Using a construction calculator.

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. Pitch rise run and diagonal. Position the square at the end of the rafter board with the tongue on your left and facing away from you. Span is the horizontal distance between the outside.

Supported by lally columns. 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. Cover some of the more common roof and rafter terms you ll need. Rafters act more like the top chord of a roof truss than as a roof joist.

By upper third here we mean one third of the length of the rafter from ridge to top plate. The point at which all the rafters are attached to.