size of supply lies for new bathroom

1/2" off of the main line.

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.....

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!!:jester:then 3/4 might be required.

nothing fancy in there- double vanity, ttoilet and standard shower. just dont want to goof this up and wish i had more

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':thumbsup:

gwilkrrs said:

nothing fancy in there- double vanity, ttoilet and standard shower. just dont want to goof this up and wish i had more

Click to expand...

Just run 3/4" to the bathroom then 1/2" to the fixtures.
The cost difference is minimal for a job this size.