Is there a restriction on how far I can run a 3/4" branch off of my existing 3/4" copper water supply lines? The most convenient place to solder in a tee will require me to run an additional 30-40 feet of copper to get to where I need to be. I assume it's ok, since this is all in the basement. Even though the dist to the 2nd floor is much less, I have to believe running against gravity is worse than the 20 extra feet my extension will have to run. I currently have about 3.5 baths and am adding a 4th full in the basement.

Also, are their limitations to the types of fittings you can use in running copper supply lines? I need to snake around the perimeter of my room, which requires 4-5 90 deg turns. Any risk of pressure loss?