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

JFCarbonneau · Jun 3, 2010

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

Doherty Plumbing · Jun 4, 2010

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

Sponsor · 2022-01-29T12:20:58-0800

hj · Jun 4, 2010

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.

NHmaster3015 · Jun 4, 2010

I strongly suggest that you have a proper load and design done. It will save you time, money and lots of aggravation.

Unitedleak · Oct 27, 2010

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

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

JFCarbonneau

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Doherty Plumbing

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hj

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NHmaster3015

Master Plumber

Unitedleak

Water Leak Detection

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