Drawing Roof Planes
What's New In Version X1 Training Video: Roofs - Draw and Edit Roof Planes
Roof planes are essentially 3D CAD polylines. They are created and edited like polylines, and have pitch, elevation and structural properties.
To draw a roof plane
- Select Build> Roof> Roof Plane
. - As in the following example, click and drag a baseline from point 1 to point 2.
- Release the mouse button at point 2 and move your cursor in the upslope direction. As you move the cursor, a preview outline of the roof plane displays.
- Click at point 3 to build the roof plane. Point 3 defines the upslope direction of the roof plane.
The Baseline
The baseline displays an upslope tick in the middle of the line. The upslope tick indicates the direction the roof plane slopes upward. You cannot redefine the direction of the slope. If the upslope tick is pointing the wrong direction, either rotate the roof plane or delete it and draw another.
The baseline can be used by the program as the pivot point for the roof plane. In a cross section, the baseline is the point where the outside main layer surface of the wall would extend upward to intersect the top of the roof framing member.
When drawing the baseline of a roof plane, here are some things to consider:
- A baseline does not have to be drawn over a wall, although it often is.
- The roof plane overhangs in the down-slope direction from the baseline.
- A baseline drawn along a wall should be drawn over the outer edge of the wall's main layer. It tries to snap to that layer.
- The height of a baseline is determined by the following formula:
Height of baseline = elevation top plate + the vertical depth of the rafter - the vertical depth of the rafter's birdsmouth cut.
- The elevation of the top plate is defined by the ceiling height in the room.
- If a baseline is drawn over the top of any other roof plane, the baseline height equals the height of the existing roof plane at the point where you started drawing.
