Revit Birdmouth Cut Roof

Use one of the opening tools to cut a vertical or perpendicular opening in a roof floor or ceiling for example to accommodate a chimney.

Revit birdmouth cut roof.

You can cut openings in the faces of these elements or you can select the entire element to make a vertical cut. When you placed fascia and set the rafter cut of the roof to two cut plumb or two cut square in the roof properties only the slope defining edge was affected. To create the desired cut you can use an in place void family on the high roof. 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.

For most buildings the birdsmouth cut is 4 inches 10 cm deep. The birdsmouth joint also called the birds beak cut or birds beak joint is a small triangular shaped cut out at the base of a roofing joist that allows the joist to sit nicely on top of the wall plate top of the wall before the roof starts. This is relatively simple. You created a roof that has only one slope defining side.

Determine the depth of the birdsmouth cut. Use a square placing one side against the plumb cut line. Measure the full width of the outside wall. Solution by design only roof edges that are slope defining are affected by the rafter cut.

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. Architecture tabopening panel structure tabopening panel use the by face option when you want the. Get these project files and all advanced 1h courses. This new line marks the horizontal cut for the bird s mouth.

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.