Placing lights on a slab ceiling

[aacorley]

Is there a way to get Revit to use the bottom of the slab of the floor above as the ceiling for the room on the floor below?

[aacorley]

Okay here's some more information and it gets kind of weird.

When I create an ACT ceiling and add lights, they come in right side up.

When I create a generic ceiling with concrete as the material type and add lights, they come in upside down.

When I create an ACT ceiling, add lights and then change the ceiling properties to generic with concrete material, the lights come in right side up and stay right side up.

Any ideas what's going on? I'd rather not have to keep changing ceiling types but it's not that bad of a workaround

Using Revit MEP 2009.

[bcaudill]

A few things to check.

Make sure when your placing lighting, your underlay orientation of your view is set to RCP or, it will view it upside down. These are "Reflected" plans, so REVIT looks from the ground up.

When hosting to slab, you have (2) options.
(1) You could use reference planes. Keep in mind though, that if you do, things will come in upside down again. I have set mine in the past to 1/4" below the deck. You will need a reference plane for every change in ceiling height change.
(2) and most practical, have the architects put ceilings in ALL rooms and spaces. Even if it's an 1/8" ceiling with no pattern. Lighting needs a hosting element, so someone must provide it. (This will also apply to exterior canopy's).

HTH,
~BMC

[aacorley]

Good call. Some of my ceiling plans were not set to reflected ceiling plan.