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Old 03-15-2016, 06:04 PM   #1
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Maximum 1/2" PEX run? Maximum TEE's?


I'm t-ing off my 3/4 copper hot water line to run new hot water to several fixtures: two sinks, one dishwasher and two outdoor hot/cold spigots.

I figured I'd run a 3/4 PEX main, then branch off: but I'm curious: what's the maximum 1/2" PEX run I can have? I have one bathroom sink that's quite a distance away from the other fixtures.


Also, I'm curious how many 3/4-1/2-3/4 tees can you put on a main line? Would I be better off running a 3/4-3/4-3/4 tee to consolidate fixtures (by adding a 1/2-3/4-1/2 tee to serve two fixtures
?)
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Old 03-15-2016, 07:00 PM   #2
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Re: Maximum 1/2" PEX run? Maximum TEE's?


Use mini manifolds instead of tees.
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Old 03-16-2016, 04:31 PM   #3
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Re: Maximum 1/2" PEX run? Maximum TEE's?


Normally 2 things on a half inch run is good practice. If you do not have 5 or more baths don't sweat the 3/4 tees.
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Old 03-16-2016, 08:47 PM   #4
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Quote:
Originally Posted by rjniles View Post
Use mini manifolds instead of tees.
I found an Uponor manifold that seems to make things a little easier. Thanks for the advice!

Quote:
Originally Posted by Ghostmaker View Post
Normally 2 things on a half inch run is good practice. If you do not have 5 or more baths don't sweat the 3/4 tees.
So two fixtures on 1/2" is okay?

Is there a length limit?
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Old 03-18-2016, 10:38 PM   #5
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Re: Maximum 1/2" PEX run? Maximum TEE's?


When sizing water lines you need to use a chart that is in the UPC Code Book. In your case you should find out the pressure at the Meter, Measure the length of the longest run and you must know the fixture value of the fixtures served by that branch. When you take the total of all fixtures including hose bibs you will find the minimum size of the main line and all of the branch lines. By gathering all of the above information you can make a drawing and size each branch as needed according to the chart for your water pressure, length of run and number of fixture units that are to be served. You really should investigate this proceedure and chat with the local Admin. Authority to be certain that you do this correctly. It is not Rocket Science but it is science. Good luck.
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