Roof Pitch Plumb Cuts

Common rafter calculator rafter dimensions plumb cuts birds mouth dimensions and cutting templates metric.

Roof pitch plumb cuts.

Mark the plumb cuts. Hip roof framing rafter cut angle template diagram. The picture below shows the first rafter lengths in green which is from the ridge to the wall plate. Set the framing square on top of the rafter beam with the tongue facing the top of the rafter.

It is used on the top tail and bird s mouth. Mark the plumb cut at the top of the rafter. Then use a pencil to trace the outside edge of the framing square s tongue. Roof pitch is measured in a rise to run ratio with the vertical rise always shown first.

With the saw bevel angle set to 45 cutting hips and creepers at the plumb cut angle will produce correct side angles. The plumb or ridge cut is made at the top of the rafter. The pitch of the unequal hip rafter can be expressed in relation to either the main roof or the secondary roof. If using a circular saw or compound miter saw set saw bevel angle to 45 to obtain creeper and hip side angles.

Roof pitch degree table. The angle of the cuts made on the pitch end of the rafters will depend upon the rise you ve calculated. It is used on the bird s mouth and tail cuts. Rafter run to outer wall roof angle overhang level rafter depth.

This will give the square the proper angle. Since you need only one set of numbers to lay out the cuts let s work with the main roof which has a unit rise of 8 inches. So if your roof is a 45 degree angle that is for every 12 along the horizontal run it rises 12 it s a 12 12 pitch. To measure out your cuts you ll need a pencil a framing square and movable stair gauges to make accurate cuts.

See saw miter and blade angle settings. Plumb cuts represent the vertical or straight up and down cuts once the rafter is placed in position. If it rises only 6 for every 12 it s a 6 12 pitch. Level cut refers to the horizontal line after the rafter is set in place.

Use your roofing square set to the plumb cut to mark the plumb angles down from those points. It is helpful to have stair gauges so that you can measure the first half of your pitch on the vertical part and the second half of the pitch on the horizontal part of your framing square. Choose which end of your rafter you want to be the top. The plumb cut will be the point where your stud connects to the ridge beam.