Page 783 - Chief Architect Reference Manual

Build Roof Dialog

• The default value is 0, which creates roof Roof planes are raised and lowered as
planes that bear on the wall top plates at needed so that eaves meet correctly.
the Ceiling Height of the room below.
• Increase this value to raise roof planes so The eave height used when this box is
they do not bear directly on the wall top checked is that of a roof plane using the
plates. If roofs are raised sufficiently, default Pitch and Overhang values. When
Attic walls will automatically generate to this box is checked, all roof planes are
support them. The exact height depends affected, including those that do not need
on the roof pitch. adjustment in order to align with adjacent
planes.
• Decrease this value to drop roof planes
downward and decrease the height of the When Same Height Eaves is checked,
bearing walls. If roofs are lowered suffi- any non-default overhang values speci-
ciently, they may extend into rooms, pro- fied in the Wall Specification dialog are
ducing areas with angled ceilings. used. Roof planes are raised or lowered so
• Check Ignore Top Floor to ignore the top that the eave height is the same, regard-
living floor when roof planes are gener- less of the horizontal overhang.
ated. Roof planes are built on the top • Uncheck Allow Low Roof Planes only
plates of the walls below the top floor. when an upper floor overhangs roof
Specify how you would like the eaves of roof planes below.
planes with different pitches to meet. See Uncheck Automatic Birdsmouth Cut
“Aligning Eaves” on page 794. 5 to enable the settings below. When
• Check Same Roof Height at Exterior checked, the birdsmouth is calculated based
Walls to keep bearing walls the same on the pitch and rafter depth and its values
height and change horizontal roof over- are listed here for reference. See
hang distances as needed so that eaves “Birdsmouth Cut” on page 797.
meet correctly. When checked, this option The Raise Off Plate and Birdsmouth settings
ignores any overhang values you may do not affect the bearing wall heights.
have entered in the Wall Specification
dialog. See “Aligning Eaves” on page • Enter a positive Raise Off Plate value in
794. this field to produce the trusses with an
energy heel to allow for more insulation.
Uncheck this option to raise or lower • Enter a negative Birdsmouth Cut value
some roof planes relative to the wall’s top to control the Birdsmouth Depth. For
plate, allowing all horizontal overhangs to example, for the Birdsmouth Depth of 3”,
be the same unless a non-default value enter -3”. The location of the Baseline
has been entered in the Wall may change if you use the Raise Off
Specification dialog. See “Roof Direc- Plate setting to specify the birdsmouth
tives in Walls” on page 376. depth. See “Birdsmouth Cut” on page
• Check Same Height Eaves to keep the 797.
eave height for all roof planes the same.

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