Roofing Rafter Finder

Check your results with the omni roof pitch calculator.

Roofing rafter finder.

Once you measure the distance from the wall to the center of the first rafter. Find the inverse tangent of the pitch to find the angle in degrees. Half building width minus 1 2 ridge thickness. Divide the first part of the ratio by 12 to work out the pitch.

Find its length with our online rafter length calculator. Rafters are evenly spaced so knowing how far apart they are gives you the ability to find the rafters while on the roof. The length of the rafter. Rafter length calculator a useful shed roof rafter calculator to calculate the rafter length for the given dimensions of the roof of the building or a structure.

Use the diagrams on this page as a reference when inputting rise and run and while interpreting the calculated results. Height of the scaffold. Includes result for hip valley factor slope factor and the roof slope in degrees. 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.

Transfer the measurements to the roof. See rafter run to outer wall calculator below. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. 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.

Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. The roof pitch calculator calculates slope pitch angle and rafter lengths based on input of rise m and run r. The run of the rafter. Measure from the center of the first rafter to the center of the second rafter.

The rise of the rafter. 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. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. The results are automatically fired.

Allow for ridge thickness when determining rafter run to outer wall.