Is there more sink plumbing through walls or floors?

I am hoping to receive some valid info from seasoned plumbers to give me an idea of how many bathroom vanities are plumbed through the floor rather than the walls. I haven't a clue, so any help is greatly appreciated.

Public Comments

1. Depends what kind of walls and floors you have. If walls are hollow and floor solid, plumb through wall, or vice versa. If you are meaning drainage particularly, there are rules governing what can be run outside (in the UK, at least) because of the risk of freezing. Elsewhere it is probably a matter of what is most convenient.
2. Most vanities are plumbed thru the wall. This is due to venting and draining issues. I have seen some vanities plumbed thru the floor but this was on older homes built in the early 1900's with the use of a "S" Trap but now we use the "P" trap. If you have an older home and if the drain goes thru the floor it is legal or grandfathered. If there is only a straight pipe going thru the floor then either you have no trap and your sink is open to the sewer and gases can come out of sink drain or you could have a drum trap. You will know if your fixture is traped, you will smell sewer gases. If you are doing a remodel or new construction go thru the wall if not you are not doing it by code and your building inspector will not pass it. Hope this helps.