water pipe size

[wannabedivin]

I have to move the outside water Fawcett.  the piping under the house is 1/2 and the old bib is 3/4.  I need to run about 15 feet of additional piping.  will I gain anything by connecting the additional footage in 3/4,  if it connects to a  1/2 inch feed?  Also will a 3/4 bib vs 1/2 make a difference.  I was under the house yesterday and did not see anything but 1/2 piping

[Robert Adams]

Depends on how far you are moving it. If it's going a long distance away I'd go with 3/4. You won't see an increase in flow but you also won't see a decrease due to the friction from the longer pipe run. 

     Me I'd love to see 1" pipe and hose bibs and 1" garden hose but that isn't going to happen...

[crokett™]

Since you're under there anyway, I'd consider replacing the whole run with 3/4" if you have access. If you choose not to do this I'd make the new section 3/4".