How To Cut Roof Rafter Birdsmouth

This ensures that you make the birdsmouth cut at the right length in the rafter. If the roof has a 30 degree pitch the underside of the rafter and the vertical cut of the birdsmouth form a 120 degree angle. This new line marks the horizontal cut for the bird s mouth.

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Making a birdsmouth joint.

How to cut roof rafter birdsmouth.

A birdsmouth cut in a rafter measures the same angle as the pitch of the roof. Measure and mark plumb cut. Mark the plumb cut at the top of the rafter. The plumb or ridge cut is made at the top of the rafter.

How to cut bird s mouths in rafters step 1. Calculate the pitch of your roof. Take a break from the measuring by cutting the top end of the rafter first. If you have never done.

With your ridge cut or plumb cut made you are now all set to. Make one rafter that has the bird s mouth cut in place and extends out past that for your roof overhang test fit it in place and mark it pat for pattern rafter to use in cutting its sisters. Choose which end of your rafter you want to be the top. Rise is the vertical distance from the top plate of.

In my photo above the green rafter line length is from the plumb cut face or ridge board face to the plumb cut face of the bird s mouth notch. Make a mark along the top edge of the rafter where this measurement ends. The result of this equation represents the. Pitch rise run x 2.

This is the first stage of the process. Use the square root figure to measure along the top of the rafter. The cut itself measures 90 degrees in order to rest snugly on the right angle of the wall plate. How to cut a birdsmouth joint calculating the pitch of a roof and making ridge cut.

Draw a line at right angles to the bird s mouth plumb cut starting 3 inches up from the bottom of the rafter but no more than half the thickness of the rafter. Multiply your pitch by 24 to determine the rise per foot of run. Simple jig to cut your birds mouth notches. Set the framing square on top of the rafter beam with the tongue facing the top of the rafter.

Use a square placing one side against the plumb cut line. Calculate rafter or joist length to birdsmouth location.