I live in a small two story house (row home) with water service entering through the basement. The bathroom is on the second floor. Whoever did the main service line used 1/2 inch copper instead of the propper 3/4 inch, so I don't have ideal pressure. Moreover, the main shutoff valve is a globe valve, which I understand limits flow. After the valve, the rest of the main line is 3/4 inch pipe.
I don't have a water pressure problem when only one fixture is running, but the pressure drop is noticable when a second fixture is turned on.
Would it be worth it if I replaced the globe valve with a ball valve? How much difference should I expect in pressure just by replacing the valve?