Marc MacSharry (Sligo-Leitrim, Fianna Fail) | Oireachtas source

It used to be wall to wall. Maybe I am mixing things up. One measurement system was wall to wall and the other one is window to window, glass to glass. Over a very large building, that can mount up. One system included pillars and one did not. One system included the void spaces like stairwells, lift shafts and so on. That was it.