To work independently, a plumber is required to receive a license. In most states, the prerequisite for earning this license is two to five years of practical experience. There's also an exam to test technical know-how and understanding of plumbing codes. The United Association's website offers extensive information on licensing requirements by state.
I was disappointed with the pressure of a tub and shower that were plumbed with 1/2 supply lines (2nd floor). Could be low pressure from the street, but I want to replace with 5/8. Plus, I'd like to have 2 back to back showers, one inside and one outside. So, I had intended to bring a 1 supply to both, then branch up to valves and shower head with 5/8. Finally, I thought pressure from the street was typically 55 to 70 psi and I am concerned if pvc can take that.Any thoughts?