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btu output

radmix Member Posts: 194
Then there should be no reason to use 1/2"joist trak. 3/8" is much easer to pull through joist bays then 1/2"pex. It does not expand as much unless you are using 1/2"pex-al-pex granted your manafolds will start to expand. The 1/2" uponor pex kinks very easly if you are not careful.


  • radmix
    radmix Member Posts: 194
    btu output

    i am looking for a chart with btu output of 3/8 joist trak. i have one for 1/2 inch and would like to bo some comparisons.
  • Andrew Hagen_2
    Andrew Hagen_2 Member Posts: 236

    Does Uponor make 3/8" Joist Trak now?
  • radmix
    radmix Member Posts: 194
    3/8 joist trak

    Thay have for a few years now

  • There is no appreciable difference.
  • Al Letellier_9
    Al Letellier_9 Member Posts: 929
    btu outpput

    It depends on a lot of conditions,but the output is generally about the same with only slightly higher temp needed. Sure is a lot easier to use than 1/2" !!!!

  • the plates should prevent expansion, except in supply/return runs. Leave run for them to expand, use reset control.

    You're right though in MOST cases 1/2" isn't really needed; it does give you longer loop lengths which, in some areas, might be worthwhile.. that does reduce joist penetrations.

    But you need to know what you're doing with 3/8" design in terms of flow rate requirements and frictional losses, moreso than with 1/2". Obviously there isn't as much "wiggle room".
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