Is there an easy way to replace the copper to my 2nd floor bathroom with PEX? I suppose that I will need to open the wall in the room under the targeted bathroom.
What I had was an open basement ceiling and 90% of the plumbing was on the first floor. I ran one chase up to the second floor with a H&C .75 pex in one stud bay I opened up below the bathroom wall. Instead of trying to run it under the second floor I ran it around the room and hid it with a baseboard trim.
Pretty much it is the same job as running a wire thru a wall. You sometimes need to open the wall.