Roof Rafter Framing Details

The point at which all the rafters are attached to.

Roof rafter framing details.

Rafters act more like the top chord of a roof truss than as a roof joist. Refer to the figure as you study the terms discussed in the next paragraphs. The function of each component is. By upper third here we mean one third of the length of the rafter from ridge to top plate.

Parts of a roof a ridge board is a horizontal member of the roof frame. Pitch rise run and diagonal. Definition of collar tie in roof framing definition. Transfers the load of the roof through the raftersto walls below.

Joists and collar ties. The rafters carry the applied loads to the exterior walls. Add the length of the overhang beyond this mark and. Using a construction calculator.

Position the square at the end of the rafter board with the tongue on your left and facing away from you. Roof features associated with basic roof framing terms are shown in figure 2 2. 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. Span is the horizontal distance between the outside.

The values on the calculator that we use for common roof framing are. 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. Cover some of the more common roof and rafter terms you ll need.

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.