Welcome on tibweb.
Pavement is no real building. It's terrain and underlies the special rules of terrain.
I think you can only make pavement buildable on rough ground by editing the rough ground tiles (but i'm not sure), as the terrain inis (temperat.ini /snow.ini) don't contain a key which defines the type of ground of the special terrain tile (e.g. rough, road, clear, water etc).
Though it can also be impossible as pavement is an auto-LAT (means it's automatically placed with transition pieces to clear,grass... ground along the border) and auto-LAT terrain has some special hardcoded features (no ini keys for customization available).
QUOTE (TastyWheat @ Nov 16 2009, 09:24 PM)

Also, is there a way to extend the pavement off the edge of the map or prevent subterranean units from popping up on map edges?
Player and AI units are unable to leave the map, except a special trigger tells them to do so.
That's why you must have overlooked a free cell in the playable area of the map.
This post has been edited by Lin Kuei Ominae: Nov 16 2009, 09:18 PM