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

  1. #1
    DIY Junior Member
    Join Date
    Oct 2009
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    NH
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    7

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

    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. #2
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Jun 2009
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    Penticton, BC
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    810

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    I would suggest the 1/2" pex @ 300' coils with close spacing on the outside walls, especially near windows.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Cave Creek, Arizona
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    25,653

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    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. #4
    In the Trades Wally Hays's Avatar
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    Nov 2009
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    New England
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    I strongly suggest that you have a proper load and design done. It will save you time, money and lots of aggravation.
    Perception is 3/4 of reality

  5. #5

    Default

    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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