I was installing a bit of rubber base on a commercial project yesterday and noticed something that I've never seen before. There were 1" holes every 12" along the floor. I'm curious if this is some new requirement in commercial or medical environments (this was a dental office ), or if this was something done by the previous contractor that was hired to repair a water leak in an unoccupied adjoining space in an attempt to dry out the sheetrock or wall interior.
It would seem to me to have created a reduction in fire protection and the potential for other problems. Anyone else ever encountered something like this?