Pipes for bathroom


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Old 07-21-18, 06:19 AM
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Pipes for bathroom

My son's new house has one bathroom where there is barely any water pressure. Essentially the shower is unusable. I looked in the basement and I think I found the pipes that supply the water (not yet 100% sure), and it looks like they may be 3/8.

If that's the case, that will mean a redo. Just making sure that 3/8 is NOT the norm?.

My understanding it that it need to be 1/2, usually coming off 3/4 "main" somewhere else?.


Also, there is a pressure gauge at the meter, and it reads 48 psi when there are no faucets running. Does this sound ok to you guys?. I thought it needed to be in the 50's. Someone told me MY house has 60 psi, and I have great pressure.
 
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Old 07-21-18, 08:35 AM
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It's unlikely to have 3/8" piping. (not impossible though)

48psi static pressure (with no faucets on) is reasonable, low, but reasonable. The issue is more likely when a faucet is turned on, the pressure drops. This is often due to some kind of restriction in the pipes.

A few things to check
* Make sure all the valves are wide open.
* Are all the faucets the same and slow? Or just the shower?
* If it's just one fixture, it could be a clogged filter on the showehead or faucet

If the easy items aren't it, you mentioned a new house. Is it new new, or old, but new to him? When was it built?
 
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Old 07-21-18, 08:51 AM
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Check the pressure gauge again with something running. If it lowers excessively.... that will be a problem for the second floor pressure.

Is it the shower only that has low pressure ?
I'm thinking possibly clogged shower head.
 
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Old 07-21-18, 01:49 PM
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Hi, City Water or well water?
Woodbutcher
 
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Old 07-21-18, 03:53 PM
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it looks like they may be 3/8.
- a 1/4 inch copper pipe has a 3/8 inch O.D.

- a 3/8 inch copper pipe has a 1/2 inch O.D.

I think both of those sizes would be incorrect as a branch from the main trunk in the house to a fixture. Iím pretty sure those should be 1/2 inch Ė which would mean a 5/8 inch O.D pipe. Maybe the other guys know for sure.
 
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Old 07-21-18, 06:43 PM
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It is just that one bathroom. Everything else is acceptable.....not great, but acceptable.
 
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Old 07-21-18, 06:46 PM
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if you run the garden hose outside, the pressure drops to 42 psi. We will try a different shower head, but the sink also has just a trickle. It is only that one bathroom, though.
 
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Old 07-21-18, 06:49 PM
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City water. There is a pressure pump installed but it looks like it is for the sprinkler system.
 
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Old 07-22-18, 06:11 PM
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Mystery solved: the line in question was for a toilet, and the pressure problem was clogging, so PJMax wins the prize.
 
 

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