1/2" or 3/4" PEX in slab?

Discussion in 'Boiler Forum' started by JFCarbonneau, Jun 3, 2010.

  1. JFCarbonneau

    JFCarbonneau New Member

    Messages:
    7
    Location:
    NH
    Hi,

    I am planning the radiant slab installation in our new house in NH. Slab is approximately 1,500 sf.

    I have to decide between 1/2" PEX spaced at 12" (5 rolls of 300ft) or 3/4" PEX spaced at 18" (2 rolls of 500ft). What do you think?

    Thanks,

    JF
  2. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    I would suggest the 1/2" pex @ 300' coils with close spacing on the outside walls, especially near windows.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,837
    Location:
    Cave Creek, Arizona
    Dan Holihan wrote a column about a friend of his who ran "1,000 feet of 3/8" tubing" for a system. The rest of the installation was a comedy of errors and he never told how it was resolved, assuming this was a factual recital of a system.
  4. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    I strongly suggest that you have a proper load and design done. It will save you time, money and lots of aggravation.
  5. Unitedleak

    Unitedleak Water Leak Detection

    Messages:
    3
    Location:
    Indiana
    Wally knows of what he speaks. Hire the planning to be done by someone who knows more than you, and if you're feeling a little DIY-ish, you can follow the plans. United Leak Detection
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