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    snucky's Avatar
    snucky Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Sep 22, 2010, 09:22 AM
    1/2'' copper down to PEX - which size PEX is best?
    We're finishing our basement and I want to re-run the kitchen supply line because the 1/2'' copper runs underneath (perpendicular) to the 16'' on center joists and thus lowers the ceiling by a full inch (it will need to be shimmed). I want to install PEX that runs through the center of the joists thus saving the 1'' loss the copper entails.

    The copper pipe is a regular 1/2'' branch line. What size PEX would I need to replace that with? Thanks for all your help!
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #2

    Sep 22, 2010, 09:47 AM

    Hi Snucky:

    1/2" copper to 1/2" PEX should be fine for a kitchen sink and dishwasher.

    If you were feeding a shower or more than the two fixtures above I would recommend 3/4" PEX, but this case only warrants 1/2" PEX.

    Mark
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