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626 | ChapteR 15 Creating StairS and railingS

Using the overall height determined by the base and top levels, the stair object will be equally
divided into risers. The maximum riser height is defined in the type properties of every stair
type. The overall height of the desired stair will be equally divided into risers not exceeding the
defined maximum riser height. Tread depth is specified in the stair’s type properties as well, but
that may be overridden if you manually lay out the treads in Sketch mode.
In addition to the simple rule of overall riser height, some public agencies require a stair
calculation to be employed for dimensional compliance. This type of calculation can be enabled
from the stair’s type properties as well. With either of the stair commands activated, click the
Edit Type button and then the Edit button in the Calculation Rules parameter. This will give you
the Stair Calculator dialog box (Figure 15.4), which will allow you to enter the code-based values
driving the creation of new stairs.

Figure 15.4
The Stair
Calculator dialog
box

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