Autodesk 24108-051400-9000 - AutoCAD Revit Architecture Suite 2008 User Manual page 1191

If you want to
specify the total number of stair risers
specify the height of each riser in the stair flight
specify the tread depth for each tread in the stair flight
NOTE If a value is set to user-defined on the Calculation rules worksheet, it can be modified directly in the
Properties palette.
NOTE If is displayed next to a field in the Calculation Rules dialog box, that field can't be changed until
another field is changed from
9 Select the type of arc constraint to use when creating the spiral stair:
If you want to
create a spiral stair run with no constraints
create a spiral stair with a specific number of degrees for the
stair flight
create a spiral stair with a specific degree for each tread in
the stair
10 Expand Advanced.
11 Specify the Floor Settings:
If you want to
change the thickness of the floor finish material at the top of
the stair
change the depth of the structure at the top of the stair
change the thickness of the floor finish material at the bottom
of the stair
Then
select Calculation rules, and then enter a value for Riser Count.
When Riser Count is set to
of risers is based on the overall length and overall height
of the stair and the code limits specified on the Design
Rules tab. The Straight Length value of the stair is
adjusted automatically.
When Riser Count is
a value that is used to calculate the tread depth and riser
height. If these values fall outside the stair limits, an error
message is displayed.
select Calculation rules, set all fields to
the icon to Riser to change it to
Riser.
select Calculation rules, set all fields to
the icon next to Tread to change it to
for Tread. You can also specify the Riser count when you set
the tread depth.
(user-defined) to (automatic).
Then
select Free for Arc constraint.
select Total Degrees for Arc constraint, and enter a value for
Arc angle. This includes the terminal landing or tread.
select Degrees per Tread for Arc constraint, and enter a value
for Arc angle.
Then
enter a value for Top offset.
enter a value for Top depth.
enter a value for Bottom offset.
Creating a Spiral Stair with User-Specified Settings | 1151
(automatic), the number
(user-defined), you can specify
(automatic), click
, and enter a value for
(automatic), click
, and enter a value