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Old 12-08-2012, 08:04 PM   #1
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size of supply lies for new bathroom


i am building an addition with a full bathroom. i am bringing the hot and cold supply lines to it with 3/4" lines. i plan to transition down to 1/2" lines right at each individual fixture. is this ok or should i step down to 1/2" as i come off the main lines and run the individual supplies in 1/2"?

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Old 12-08-2012, 08:09 PM   #2
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size of supply lies for new bathroom


1/2" off of the main line.

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Old 12-08-2012, 08:54 PM   #3
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size of supply lies for new bathroom


ok- i was wondering because off the main lines i will run about 16'-20' to each fixture and didnt know if the 3/4" would hold more water for those distances.....
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Old 12-08-2012, 11:09 PM   #4
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size of supply lies for new bathroom


3/4 lines allow over twice the volume of 1/2 inch however, unless your water pressure is very low the 16 -20 foot 1/2 inch lines should handle the flow easily. UNLESS..you ARE INSTALLING SOMETHING LIKE A SUPER SHOWER WITH 6 HEADS!!then 3/4 might be required.
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Old 12-09-2012, 06:39 AM   #5
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size of supply lies for new bathroom


nothing fancy in there- double vanity, ttoilet and standard shower. just dont want to goof this up and wish i had more
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Old 12-09-2012, 10:05 AM   #6
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size of supply lies for new bathroom


I n my last house where I acted as General Contractor I was on a well and had 3/4 mains in basement with 1/2 inch to fixtures including MB ensuite on second floor which was farthest from pressure tank (65') with no problems. When we sold, the home inspector ran the tub, shower and sink full blast then flushed the toilet with no discernible drop in flow and gave it the ol'
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Old 12-09-2012, 03:21 PM   #7
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size of supply lies for new bathroom


Quote:
Originally Posted by gwilkrrs View Post
nothing fancy in there- double vanity, ttoilet and standard shower. just dont want to goof this up and wish i had more
Just run 3/4" to the bathroom then 1/2" to the fixtures.
The cost difference is minimal for a job this size.

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