30 feet of height will cause a pressure loss of 13 PSI. Measure the pressure at a hosebib on the ground floor. 40 PSI at the fixture is generally sufficient, you can get by with 30 but you won't like the pressure. So you will ideally have 53 PSI or more at the ground level.
to add to a great answer. you also cut down the volume of water by installing under sized piping minimum size to that bathroom is 3/4 . here is a rule of thumb for upc code 1/2 to 1 fixture only, 3/4 to 2 fixtures then tee off with 1/2 to the last
Quote: Originally Posted by phishfood 30 feet of height will cause a pressure loss of 13 PSI. Measure the pressure at a hosebib on the ground floor. 40 PSI at the fixture is generally sufficient, you can get by with 30 but you won't like the pressure. So you will ideally have 53 PSI or more at the ground level. Thanks for the advice and here's the result. I just measured the pressure at the garden hose connection and it was 60psi. I also measure it at the 3rd floor bathroom and it was 50 psi. I guess this mean I don't actually have a pressure issue. What could cause such a low volume of water to flow?
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