I am finally getting the hang of loading maps from a file. In the file for part of the ceiling I have this(I am using the exact code from the NeHe level loading)
-3.0 1.0 -3.0 0.0 6.0
-3.0 1.0 3.0 0.0 0.0
3.0 1.0 3.0 6.0 0.0
-3.0 1.0 -3.0 0.0 6.0
3.0 1.0 -3.0 6.0 6.0
3.0 1.0 3.0 6.0 0.0
This won't put the ceiling "up" it keeps it at the same level as the floor.