Roof Rafter Framing Details

Pitch rise run and diagonal.

Roof rafter framing details.

Add the length of the overhang beyond this mark and. 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. Position the square at the end of the rafter board with the tongue on your left and facing away from you.

Cover some of the more common roof and rafter terms you ll need. Supported by lally columns. Using a construction calculator. 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. In a rafter roof all of these components are required to provide a stable roof. Roof features associated with basic roof framing terms are shown in figure 2 2. 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.

Span is the horizontal distance between the outside. Transfers the load of the roof through the raftersto walls below. Ridge beam sits below the rafters. 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.

Refer to the figure as you study the terms discussed in the next paragraphs. The function of each component is. Definition of collar tie in roof framing definition. The values on the calculator that we use for common roof framing are.

The rafters carry the applied loads to the exterior walls. Rafters act more like the top chord of a roof truss than as a roof joist.