Hi Duncan, Many thanks for your reply and taking time to respond. I have also experienced the slab picking up elements even if they are off in the display. However in this case even if I have only 1 element that defines the boundary of the area I want to flood to, it still does not work using either Create Slab by Flood in Form Modelling or the Architectural Place slab tool. I will have to find another way or manually create the slab on each level.
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