Roof Rafter Framing Details

Pitch rise run and diagonal.

Roof rafter framing details.

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. Transfers the load of the roof through the raftersto walls below. Refer to the figure as you study the terms discussed in the next paragraphs. In a rafter roof all of these components are required to provide a stable roof.

Rafters act more like the top chord of a roof truss than as a roof joist. 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. Using a construction calculator. 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. Position the square at the end of the rafter board with the tongue on your left and facing away from you. The values on the calculator that we use for common roof framing are. By upper third here we mean one third of the length of the rafter from ridge to top plate.

Joists and collar ties. The point at which all the rafters are attached to. Span is the horizontal distance between the outside. Ridge beam sits below the rafters.

The function of each component is. Roof features associated with basic roof framing terms are shown in figure 2 2. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Parts of a roof a ridge board is a horizontal member of the roof frame.

Roof framing terms are related to the parts of a triangle. The rafters carry the applied loads to the exterior walls.