Create a false ceiling from an RCC slab

Add a ceiling, then use its Create False Ceiling option to draft a false ceiling, since a slab drawn with the Slabs tool has no such option.

1. To draft a false ceiling, add a ceiling (Home > Add Ceiling), select it and use its Create False Ceiling option. A slab drawn with the Slabs tool (an RCC slab, 150 thick) has no Create False Ceiling option.

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2. Modify the shape using the offset tool with the copy option to make a central cutout, and refine edges with the fillet and chamfer tools.

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