Roofing Rafter Finder

Height of the scaffold.

Roofing rafter finder.

The rise of the rafter. Half building width minus 1 2 ridge thickness. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Divide the first part of the ratio by 12 to work out the pitch.

Check your results with the omni roof pitch calculator. Allow for ridge thickness when determining rafter run to outer wall. See rafter run to outer wall calculator below. Measure from the center of the first rafter to the center of the second rafter.

Transfer the measurements to the roof. To convert between american roofing ratios and pitch degrees follow these steps. A typical asphalt shingle roof has a layer of wood based sheet material usually plywood or chipboard and normally with a layer of tar paper. Includes result for hip valley factor slope factor and the roof slope in degrees.

Use the diagrams on this page as a reference when inputting rise and run and while interpreting the calculated results. The run of the rafter. Rafters are evenly spaced so knowing how far apart they are gives you the ability to find the rafters while on the roof. The roof pitch calculator calculates slope pitch angle and rafter lengths based on input of rise m and run r.

If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Find the inverse tangent of the pitch to find the angle in degrees. Once you measure the distance from the wall to the center of the first rafter. The reason is that stud finders are designed to scan through sheet materials such as drywall or plywood that have a fairly smooth surface and consistent thickness and density.

The length of the rafter. The results are automatically fired. Find its length with our online rafter length calculator. Once you ve measured the run of a rafter simply look up the right table in the ready reckoner for your roof pitch angle and using the measurements relevant to the span of the wall plates it tells you everything from all the common rafter lengths plumb and seat angles to the length of the hips the jack rafter cuts and several others are covered too.

Rafter is the beam supporting the building.