Revit Birdmouth Cut Roof

Solution by design only roof edges that are slope defining are affected by the rafter cut.

Revit birdmouth cut roof.

This new line marks the horizontal cut for the bird s mouth. To create the desired cut you can use an in place void family on the high roof. 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. 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.

Use a square placing one side against the plumb cut line. Get these project files and all advanced 1h courses. 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.

You can cut openings in the faces of these elements or you can select the entire element to make a vertical 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. This is relatively simple. The width of the 2x4 used to frame the outer wall measures 3 5 inches 8 9 cm and the outside sheathing measures 1 2 inch 1 3 cm.

Click by face or vertical. Architecture tabopening panel structure tabopening panel use the by face option when you want the. You created a roof that has only one slope defining side. 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.

Determine the depth of the birdsmouth cut.