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Mudball 12-28-2009 05:23 AM

Right size supply lines to bathrooms
Looking for opinions on running supply lines to bathrooms and kitchen or some kind of calculator. We dont have anything extra out of the ordinary. Bathrooms are a shower, toilet, and sink. The kitchen will have sink and possible future dishwasher. So then would the 1/2" pex supply lines be alright or would we need to consider larger ?

JGibbsRemodel 12-28-2009 05:52 AM

1/2" is fine. this is typical in all houses

Just Bill 12-28-2009 06:18 AM

Typically, water enters the house in 1 or 3/4" pipe. It should stay at 3/4 as close as possible to its' final fixture, then go to 1/2". If it is 1/2" from the house entry, you can have low pressure problems when someone else opens a faucet or flushes a toilet.

tpolk 12-28-2009 07:28 AM

I always run 3/4 then drop to 1/2 at fixture not that much more cost wise and keeps volume up. I think here you are allowed to drop to 1/2 when down to two fixtures on run

paul100 12-28-2009 07:36 PM

Are you doing all homeruns with the pex? If so then you will be making all the connections in the basement using a manifold. If that is the case then 1\2" is fine. If no manifold then follow what the other posters are saying and run a larger line close to the fixture before you switch to 1/2".

Mudball 12-28-2009 09:45 PM

Thank you all very much. I believe its 1" coming into the house. We are building what you might call a basement house. Concrete block walls and slab floor. We live out in the sticks and are not subject to code inspections or permits so I have to make sure they do it right. One plumber I was talking to said that if he gets the job he was going to run 1/2" from the utility room to supply the bathrooms which each bathroom has a shower, toilet and sink. Anyway I think I understand that from the 1" supply line in the utility room that the plumber will need to run 3/4" to each bathroom wall and run separate individual 1/2" off that 3/4" for each fixture. Did I say that right ?

AndrewF 12-28-2009 10:12 PM

More or less, you did.

I tend to run 3/4" as close to the room/fixtures and split from there.

Mudball 12-29-2009 08:26 PM

Thanks AndrewF that sounds great. I will make sure that 3/4" is the minimum run to each bathroom and then go from there.

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