DIY Plumbing: Up and over?

Question

I'm running new supply lines to a bathroom and I have two options. I can either go through a brick wall and up through the floor, or I can go up, through the ceiling and back down.

Is it even allowed to run a supply line up over a wall and back down to the sink and toilet?

Answer 1

Most direct route is usually the best, more joints mean more chances for leaks.

Answer 2

go through the wall going up and over gives you a risk of air lock.

Answer 3

If your running new water lines you can always go up and over if need be. If you are in a colder climate area do not run the lines anywhere near an exterior wall, you don't want the lines to freeze. Also insulating the hot line is always a plus, it will save on utilities down the road.

Answer 4

I would just go straight through the brick wall. If you go up and down, you will have a lot more bends, and you will lose pressure because of it. Plus you use less pipe, saving you money.