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Creates a slab in a room, defined by a closed set of walls.

1. Start with a set of closed walls.
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2. Open the tool's Properties and define the slab style on the General page. See Slab Styles. You can also change a slab's style using the Selection Info palette.
3. Activate Add Slab by Click and click anywhere inside the room.
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   The slab is created inside the room, between the walls.
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4. You can also specify to offset the slab from the walls by using the Offset field in the Inspector bar.
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5. The thickness and area of the slab are listed in the Selection Info palette.
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Local Menu Option 

Use Wall Thickness: This option can be useful using walls with different widths. If this option is selected, the offset value for each side of the slab will be calculated separately as offset = offset*wall_width In this case offset value is dimensionless quantity and acts as a multiplier of the wall width.

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