Doesn't matter because you're going to purge the lines with air when you close it for the winter.
re
You definitely tile AFTER the plumbing ! =-You wouldn't want to look at all that plumbing running outside your nice tile job would you.
Go outside and look where your sink is, there should be a plumbing cleanout near where the sink is, this is so the plumbing can unstopped if it becomes plugged.
Yes BUT not an outside wall
It saves you going outside to a little shed
Not if you are in area where there is a chance of freezing.
By plumbing codes, no.
You must mean in DRAIN pipes. -It can not be used in plumbing pipes.
Swimming outside - so outdoor swimming in some kind of lake or river.
The pipes are on the outside of the walls and ceilings. It's much easier to service.
A plumbing engineer is the professional who designs the hot and cold water system in your home. The Plumbing Engineer is involved with systems that overlap into the mechanical, civil, and chemical engineering disciplines and supports the Civil Engineer for the plumbing systems outside the building.
they are for keeping it up