Plumb Cut Roofing

Architectural elements to use and avoid.

Plumb cut roofing.

Birdsmouth joint how to cut a birdsmouth and how to cut and install roofing rafters and joists. In this diy guide you will learn how to install a roofing joist or rafter that includes how to work out the pitch of a roof cut a ridge or plumb cut at the correct angle work out the correct length of joist you need and the exact location for a birds mouth joint how to correctly cut a birds. All roof rafters should be identical so follow the same steps to measure the plumb cut tail cut and birdsmouth cut. The traditional method has been rise inches 12 run inches.

The length of the rafter is given from the long point of the ridge cut at the top down along the top edge the board to the same plumb cut on the rafter s notch. Drawings by the author. Depending on the size of your structure you will need to cut several or many more. Plumb cut eaves are perpendicular to the ground while square cut eaves are perpendicular to the angle of the roof.

Plumb cut definition is a cut in a vertical plane. Here the birdsmouth plumb is 76 37 inches. Venting a traditional eave. Designing the right roof rake.

Determine a thickness for the ridge and use the drop down to select it. Tail cut which may be cut plumb or square depending on how the eaves are detailed. Some architectural designs call for plumb or vertical cuts as opposed. Roof pitch is measured in a rise to run ratio with the vertical rise always shown first.

On the properties palette for rafter cut select plumb cut two cut plumb or two cut square. Select a roof pitch. After creating a roof change the style of the eaves by specifying the rafter cut. The number of rafters needed will be determined by the length of your roof.

If it rises onlyread more. When framing a gable or hip roof the final step is cutting the rafter tails for fascia board. Read more about roof design. Birdsmouth which consists of two cuts a horizontal seat cut and a vertical shoulder cut.

Locate these rafter terms in the illustration below. At this point you ve cut 1 roof rafter. Plumb cut typically called the ridge cut at the top end of the rafter. Birdsmouth plumb if you study the diagram carefully you will see that there is an indentation in the roof rafter where it meets the exterior wall of the building.

For two cut plumb and two cut square specify a value for fascia depth between zero and the thickness of the roof. 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. In the drawing area select the roof. The top cut face of a rafter that is designed to butt vertically against a ridgeboard.

How to plumb cut rafter tails.