Page 789 - Chief Architect Reference Manual

Roof Planes

closed polylines, and also have pitch, 4. Click at point 3 to build the roof plane.
elevation and structural properties. Point 3 is located on the ridge edge of
the roof plane.
Before drawing roof planes, you should set
your roof defaults so that the 3D attributes of
your roof planes are correct. See “Roof Note: You cannot manually draw roof planes
Defaults” on page 775. when Auto Rebuild Roofs is enabled in the
Build Roof dialog. See “Roof Panel” on page
781.
To draw a roof plane
The upslope mark displays at the center
1. Select Build> Roof> Roof Plane .
point of the Baseline and indicates the
2. Click and drag a Baseline from point 1 upslope direction of the roof plane.
to point 2, as in the following example:
The overhang is the distance from the outer
Main Layer of the wall to the end of the eave.

The Baseline

The pitch direction and initial height of any
roof plane - manual or automatic - is
determined by its Baseline.

The Baseline of the roof plane is normally
located over the outer main layer of the wall
Line 1 - 2 is the Baseline and is used as the pivot point for the roof
plane when the pitch is changed.

Most roof planes are drawn over a The Baseline height is determined by the
wall, and the Baseline should be following formula:
located directly above the outer edge of the
wall’s Main Layer. See “The Main Layer” on Elevation of the wall top plate
page 383.
+ Vertical Structure Depth
3. Release the mouse button at point 2 and - Vertical Birdsmouth Depth
move your cursor in the upslope direc- = Baseline Height
tion. As you move the cursor, a preview In a cross section, the Baseline is located
outline of the roof plane displays.
directly above the outer surface of the main
wall layer, at the top surface of the roof
framing.

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