Roof Rafter Framing Details

Position the square at the end of the rafter board with the tongue on your left and facing away from you.

Roof rafter framing details.

The function of each component is. 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. The values on the calculator that we use for common roof framing are. 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 features associated with basic roof framing terms are shown in figure 2 2. Pitch rise run and diagonal. Cover some of the more common roof and rafter terms you ll need. Roof framing terms are related to the parts of a triangle.

In a rafter roof all of these components are required to provide a stable roof. 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. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Span is the horizontal distance between the outside.

Rafters act more like the top chord of a roof truss than as a roof joist. The rafters carry the applied loads to the exterior walls. Parts of a roof a ridge board is a horizontal member of the roof frame. Transfers the load of the roof through the raftersto walls below.

Ridge beam sits below the rafters. 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.

Joists and collar ties. Supported by lally columns.