Roof Rafter Framing Details

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.

Roof rafter framing details.

The function of each component is. Position the square at the end of the rafter board with the tongue on your left and facing away from you. The rafters carry the applied loads to the exterior walls. Cover some of the more common roof and rafter terms you ll need.

Span is the horizontal distance between the outside. 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. Parts of a roof a ridge board is a horizontal member of the roof frame. Using a construction calculator.

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. Add the length of the overhang beyond this mark and. Transfers the load of the roof through the raftersto walls below.

The point at which all the rafters are attached to. Definition of collar tie in roof framing definition. 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.

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. Rafters act more like the top chord of a roof truss than as a roof joist. Supported by lally columns. Pitch rise run and diagonal.

Refer to the figure as you study the terms discussed in the next paragraphs. Joists and collar ties.