1. Try extending the roof to the top of the map, till the top side becomes see-through.

2. Waypoints. Bots need waypoints.

Put skytexture on the side if the roof facing the sky.

You need waypoints, use commands: /dropwaypoints 1, /showwaypoints 1. Then run around the map going over pickups, playerstarts, etc. just use basic movement (no jumptricks, rocket/riflejumps, etc). Once you feel comfortable with the waypoints, use /savewaypoints.

Hope this helps.
До свидания и заткнись
-P

I've got to admit to suggestions, WTF.
Try "/minimapheight [value]" instead.

Or go to just under the roof with your player and type /minimaphere

& the best solution is /minimaphere & /dropwaypoints 1,/showwaypoints 1 ... :) Thanks Everyone...