Horizontal wall - is it possible

[ksga]

Hi
I imported a rhino model as a mass element, and have now added "wall by face" to all faces exept to two horizontal faces.
I'm not really interested in creating a similar roof type, but would like to continue using the wall on these faces (the rhino model sketches a secondary "sculptural" skin)
But apparantly it is not allowed to create a horizontal wall...

Any ideas

[Alfredo Medina]

I've never seen a wall that is horizontal; that would be called a slab.
Try "Floor by face" instead.

[patricks]

Roof, ceiling, floor, or soffit should all work. Typically a horizontal interior assembly built the same as the vertical wall assembly would be a soffit, but for that I would use a ceiling. Soffits are generally used with roofs in Revit (and are accessed by clicking the down arrow below the Roof tool).

[thomas.163390]

Floor wont wont work as the two above wrongfully are assuming, but a roof by face will work.
Why dont you want to make it as a roof? A horizontal slab will have different properties than a vertical one anyway.