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Old 03-18-2012, 02:53 PM   #16
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Need Advice on how to Correct Low Water Pressure


are you saying the whole house is plumbed in pex now

"Is some of my problem that i have a 1/2 cold feed from the W/H and the entire house is plumbed in 1/2 PEX??"

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Old 03-18-2012, 03:59 PM   #17
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Need Advice on how to Correct Low Water Pressure


Quote:
Originally Posted by Joe Tilghman View Post
If the water in the tub in running and you flush the toilet the water in the tub is a trickle.'
As Daniel said, this severe symptom is not related to the size of water line.

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I bought a pressure guage and connected it to the hose bib closest to the water feed from the street the pressure at the bib was 60+ psi so I guess that rules out the water pressure regulator and the psi from the city doesn't it??
Yep.

Quote:
Is some of my problem that i have a 1/2 cold feed from the W/H and the entire house is plumbed in 1/2 PEX??
Nope. 1/2" PEX should not result in just a "trickle" from the tub faucet when the toilet is flushed.

Quote:
What i was also thinkink about doing was plumbing to the bathroom with 3/4 pex with a remote manifold and then connect the existing 1/2 from the fixtures. I can live with the lower pressure at the other fixtures but I woud like to increase prussure in the shower.
Your "trickle" symptom does not indicate need for this plan. Find the blockage in your existing system first.

BTW, is your current PEX configuration a "Trunk & Branch" or a "Homerun"? T&B is one hot and one cold to the bathroom with a manifold at the bathroom end to feed each fixture. Homerun is a manifold at the "source" end with individual lines to each fixture. --- Your symptom indicates a trunk & branch configuration but just verifying.

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Old 03-18-2012, 04:15 PM   #18
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Need Advice on how to Correct Low Water Pressure


thank you for the input.

Would I check the pressure at the shower by using an adaptor that would screw into the shower bib?

The shower is definitely suspect,

1. there is no access panel behind the tub so I don't even know if there are any shut off valves there.

2. I don't know how connections were made at the tub I didn't go back that far in the crawl space.

3. Could there be a blockage in the tub facet cartridge it is a single handle Delta. The lady that lived here before was very old and may not have used the shower just the tub.

All of the old plumbing was 3/4" galvanized which is all disconnected I just wonder why they down sized the pipe when they replumbed?
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Old 03-18-2012, 05:16 PM   #19
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Need Advice on how to Correct Low Water Pressure


Sorry I lost my internet connection. Let me just answer some earlier questions. The house is plumped with branch and tee method entirely in 1/2" pex.

I thought with a branch and tee the main line should be 3/4" branched off with 1/2"??
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Old 03-18-2012, 06:37 PM   #20
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Need Advice on how to Correct Low Water Pressure


I think you may be losing sight of the cause of the trouble. It is certainly common to plumb a house with 3/4 inch PEX for the main, and 1/2 inch for the fixture feeders. However, it was common 40 years ago to do the whole house in 1/2 inch copper, and you are NOT going to correct the fundamental problem by replacing 1/2 inch PEX with 3/4 inch PEX. There is something else going on, as I noted almost certainly related to a blockage either in a pipe, or at a connection, or in a valve, or in the fixtures. You need to start by finding the problem and correcting it. After you have corrected the problem, then you can go on to worry about increasing the size of the main lines.

Just as a note, there is no place in the U.S. that I know of that allows anyone other than a licensed plumber to do work on other than their own house. Since this is a rental, you may want to think about that before you go ahead. Or maybe this is not a concern. Finding the blockage should be step one.
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Old 03-18-2012, 07:20 PM   #21
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Need Advice on how to Correct Low Water Pressure


Quote:
Finding the blockage should be step one.
Ayuh,... If the problem is in the shower,... I'm bettin' that might be the place to Look...

Quote:
All of the old plumbing was 3/4" galvanized which is all disconnected I just wonder why they down sized the pipe when they replumbed?
Economics.....
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Old 03-18-2012, 07:28 PM   #22
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Need Advice on how to Correct Low Water Pressure


Thank you all for the helpful responses. I plan to focus on the shower and the plumbing there.

Again thank you I will update what I find.
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Old 03-18-2012, 07:33 PM   #23
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Need Advice on how to Correct Low Water Pressure


post 12 and 16 gives great clues
take a picture of shower valve for us i am thinking it is a pressure controlled valve and it is clogged the low pressure is the valve balancing out the pressure and flushing the toilet is the valve balancing out when toilet is filling dropping even more
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Old 03-18-2012, 07:43 PM   #24
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Need Advice on how to Correct Low Water Pressure


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Originally Posted by Joe Tilghman View Post
3. Could there be a blockage in the tub facet cartridge it is a single handle Delta.
Having lurked on plumbing forums for quite a while, single handle faucets are a MAJOR cause of water flow problems.

Quote:
All of the old plumbing was 3/4" galvanized which is all disconnected I just wonder why they down sized the pipe when they replumbed?
- Because 1/2" PEX is easier to pull and make turns than 3/4" PEX.
- 1/2" PEX is cheaper than 3/4" PEX.
- If crimp rings were used they only needed one crimp tool.
- If a DIY'er did the job, all of the above.
- If a professional plumber did the job, it wasn't his own house.

My guesses anyway,
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Old 03-18-2012, 07:46 PM   #25
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Need Advice on how to Correct Low Water Pressure


I think you all are pointing me in the right direction. Something that is got me puzzled, I took the lid off of the toilet tank and found some dirt at the bottom of the tank.

The tank is only 1 month old how does dirt get into the water and get deposited in the bottom of the tank?? This same dirt could be in the shower valve.

Should I drain my H/W heater?
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Old 03-18-2012, 08:11 PM   #26
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Need Advice on how to Correct Low Water Pressure


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Originally Posted by Joe Tilghman View Post
I think you all are pointing me in the right direction. Something that is got me puzzled, I took the lid off of the toilet tank and found some dirt at the bottom of the tank.

The tank is only 1 month old how does dirt get into the water and get deposited in the bottom of the tank?? This same dirt could be in the shower valve.

Should I drain my H/W heater?
Joe,

Could be that the local water authority "flushed the mains" recently and therefore you've ended up with some sediment in the water heater. Yes, there could be some of this sediment partially clogging up your shower head or shower cartridge.

Depending on local conditions, and how frequently the mains are flushed, it's recommended that a water heater be flushed once a year, at a minimum.
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Old 03-18-2012, 09:03 PM   #27
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Need Advice on how to Correct Low Water Pressure


Quote:
Originally Posted by Joe Tilghman View Post
I bought a pressure guage and connected it to the hose bib closest to the water feed from the street the pressure at the bib was 60+ psi so I guess that rules out the water pressure regulator and the psi from the city doesn't it??

This house is a 1 story ranch hot cold fixture in the kitchen, hot cold for the shower and bathroom sink cold for the toilet plus two hose bibs.

i was going to check the pressure at the kitchen sink but got the wrong size adaptor plan to take it back and do that test.

Is some of my problem that i have a 1/2 cold feed from the W/H and the entire house is plumbed in 1/2 PEX??

Any advice/recomendations to correct this would be appreciated.

What i was also thinkink about doing was plumbing to the bathroom with 3/4 pex with a remote manifold and then connect the existing 1/2 from the fixtures. I can live with the lower pressure at the other fixtures but I woud like to increase prussure in the shower.
So what happens to the pressure at the gauge when you open shower faucet and flush the toilet?

If you have PRV this could be acting up by not opening or restricting when there is demand on flow.

Need to check pressure before and after the PRV.
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Old 03-18-2012, 10:43 PM   #28
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Need Advice on how to Correct Low Water Pressure


Quote:
Originally Posted by Joe Tilghman View Post
I think you all are pointing me in the right direction. Something that is got me puzzled, I took the lid off of the toilet tank and found some dirt at the bottom of the tank.

The tank is only 1 month old how does dirt get into the water and get deposited in the bottom of the tank?? This same dirt could be in the shower valve.

Should I drain my H/W heater?
Something I don't understand. You said that the water out of the bathtub faucet goes to a trickle when the toilet is flushed. Since only cold water feeds the toilet, I assumed you meant that the cold water from the bathtub faucet slows to a trickle. Is your hot water from the bathtub faucet being affected when you flush the toilet?

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Old 03-19-2012, 07:10 AM   #29
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Need Advice on how to Correct Low Water Pressure


One probably important thing failed to mention, was that the house sat unoccupied for almost 2 years. I plan to get at the tub plumbing tonight and start looking.
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Old 03-19-2012, 05:34 PM   #30
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Need Advice on how to Correct Low Water Pressure


I did a few checks today, I ran the tub and flushed the comode the volume sucked both on the hot side as well as the cold side.

There was no access panel behind the tub as well as no shut off valves at the tub I guess they didn't anticipate any problems when the plumbing was installed. So that rules out plugged up shut off valves. It was plumed with 1/2" copper I assume pex was plumbed in below where I was able to see.

I did make a slight improvement I took the shower head off of the pipe and found a piece of old rubber washer in the pipe.

Tomorrow I plan to remove the faucet cartridgge and check it. I also plan to install shut off valves

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