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Old 03-03-2009, 11:30 PM   #1
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bathroom plumbing pipes, 4?


In the basement bathroom a previous owner split a cold and a hot water supply pipe, into 2 cold, 2 hot. All enter through the ceiling of the basement, then one set goes down a side wall and feeds the sink and toilet. The other set follows along the ceiling then down a wall of the shower and feeds only the shower. All are 1/2" and they feed nothing else.

Is there any reason for this? Shouldn't one set of 1/2" be able to feed everything in the bathroom?

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Old 03-04-2009, 05:18 AM   #2
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bathroom plumbing pipes, 4?


when i did the plumbing here, i had to run 3/4" supplies, then when i ran off that to each sink/tub, etc. i could use 1/2". perhaps the OO was following code? or perhaps he just did it to make his job easier? i'm not real sure what you are asking.

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Old 03-04-2009, 09:44 PM   #3
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bathroom plumbing pipes, 4?


Basically, the 3/4 does not go into the bathroom at all. Instead he runs two separate sets of 1/2 inch hot and cold from the 3/4 into the bathroom. One just for the shower, one for the sink/toilet. Not a big deal, but I thought one set going in would be enough. Then just t-off at the sink, toilet and shower.

Not a big deal, just wondering for future use. Like to get the info for future projects and let them stew sometimes. Basically looking to minimize runs and connections. In the jpg below the left is an example of the cold water feeds. The right is what I thought would be good.
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Old 03-04-2009, 10:09 PM   #4
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bathroom plumbing pipes, 4?


It would be enough for the hot but not for the cold.

Hot: 1 lavatory
1 shower

Cold: 1 lavatory
1 shower
1 water closet

1/2" for 2 fixtures or less
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Old 03-04-2009, 11:14 PM   #5
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bathroom plumbing pipes, 4?


Thanks. That's what I was wondering about and stated much more clearly then I was able to. I knew there was a limit to how much the 1/2" could feed, but was thinking it was more so the runs didn't make sense.
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