Roof Rafter Framing Details

The point at which all the rafters are attached to.

Roof rafter framing details.

Cover some of the more common roof and rafter terms you ll need. Transfers the load of the roof through the raftersto walls below. 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. Using a construction calculator.

In a rafter roof all of these components are required to provide a stable roof. Joists and collar ties. Add the length of the overhang beyond this mark and. Ridge beam sits below the rafters.

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Refer to the figure as you study the terms discussed in the next paragraphs. Supported by lally columns. Roof framing terms are related to the parts of a triangle.

The function of each component is. 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. Rafters act more like the top chord of a roof truss than as a roof joist.

The values on the calculator that we use for common roof framing are. The rafters carry the applied loads to the exterior walls. Position the square at the end of the rafter board with the tongue on your left and facing away from you. Parts of a roof a ridge board is a horizontal member of the roof frame.

By upper third here we mean one third of the length of the rafter from ridge to top plate. Span is the horizontal distance between the outside.