Roof Rafter Framing Details

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge.

Roof rafter framing details.

The function of each component is. Ridge beam sits below the rafters. 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.

Span is the horizontal distance between the outside. Pitch rise run and diagonal. 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.

The rafters carry the applied loads to the exterior walls. Transfers the load of the roof through the raftersto walls below. Using a construction calculator. 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.

Parts of a roof a ridge board is a horizontal member of the roof frame. Roof features associated with basic roof framing terms are shown in figure 2 2. Definition of collar tie in roof framing definition. Joists and collar ties.

Cover some of the more common roof and rafter terms you ll need. 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. Rafters act more like the top chord of a roof truss than as a roof joist. Supported by lally columns.

Add the length of the overhang beyond this mark and. In a rafter roof all of these components are required to provide a stable roof.