you have to make sure the faces of the roof are visible underneath it
I assume you can see the roof from above?
does max have a 'flip faces' or 'flip normals' tool?
why dont you show us some wireframes? as well as an overview of the scene, might let us be more help. and put some proper lights in there, it might be that the ceiling just isn't recieving any light - drop an omni light in the middle of the room as a test.
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I assume you can see the roof from above?
does max have a 'flip faces' or 'flip normals' tool?