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Old 02-15-2011, 12:26 PM   #1
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Pipe size question for supply side...


Hi all, thanks in advance for any advice you might know/think.

Supply from our well is a one inch pipe. Supply for both hot and cold to the fixtures (kitchen, bath, and laundry) reduces to a 1/2" pipe. Water pressure ranges from 30 to 50 lbs. I'm adding a second bathroom that will have a shower, toilet, and sink.

My question is whether I can supply the new from existing 1/2" pipe or would I be better off T-ing off the one inch supply? Thanks again... Al

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Old 02-15-2011, 03:52 PM   #2
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Pipe size question for supply side...


Go off the 1"

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Old 02-15-2011, 11:21 PM   #3
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Pipe size question for supply side...


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Originally Posted by Alvis View Post
My question is whether I can supply the new from existing 1/2" pipe or would I be better off T-ing off the one inch supply? Thanks again... Al
I would T off the one inch with a 3/4" trunk line to the bathroom. Then appropriate sizes to the different fixtures.
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Old 02-15-2011, 11:38 PM   #4
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Pipe size question for supply side...


Why not just disconnect the 1/2" supply at the 1/2" x 1" connection and replace with 3/4", then use the same 1/2" runs to each fixture? If you're going already shut-off the water all it takes is a little planning and you'll increase the pressure to those 30 psi fixtures.

Just my $0.02.
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Old 02-16-2011, 05:57 PM   #5
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Pipe size question for supply side...


I agree VIP, but the 1" for the hot water is buried somewhere in the wall. Without tearing the house down it seems I'll 'have' to tee the 1/2" hot under the house and run it to the new sink and shower, a distance of 18 feet. Hmmm, I wish I did this differently the first time... lol. The cold water will be easy to tee off of however, and that's what I'll do.
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