9.4.5.1. Creating slab holes

In most cases you need slab holes when editing stairways and chimneys. Slab holes always comprise parts of slabs, you can specify their form without any restriction and you can edit them afterwards.

You can access the command from the Toolbox, the Modeling menu and the Shortcut menu.

Creating slab holes over stairs

You can create slab holes for stairs with the STAIR keyword of the command. You can select the stairs under the slab and then the hole will be created automatically for the actual stairs. In this case the profile will not be displayed as the top view of the stairs, therefore it is preferable not to use this function for stair spaces created with galleries.

The program will calculate the contour as follows:

• The width of the hole is defined by the width of stairs.

• For the depth the program will find the particular stair with a distance to the bottom of the slab equaling the free height set. This aims at allowing an adult to walk up the stairs in an upright position.

You can set the “Free height above stair” value in the dialog box File menu - Preferences - Stair standard:

• Select a slab you want to open.

• Specify the slab hole profile by the Profile definition tool in the Toolbox. Draw the profile with the option selected, or

• Select the keyword STAIR from the prompt.

• This command will automatically create the hole in the slab for the actual stairs under this slab. If there are no stairs under this slab (the program warns you about it), select the keyword BELOW. Use this keyword to select the stairs of the next floor downwards.

EnterCompletes the command.

&For a description of the Profile definition, see Chapter 8.2. Specifying profile.

!If you select stairs, the stairs must be under the slab.