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Warmboard holding

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kcopp
kcopp Member Posts: 4,432
in Radiant Heating
Has anyone ever had an issue with pex installation into warmboard where the  tubing not wanting to stay in the grooves? I used Viega barrier tubing that is on the approved list. Tubing…especially around the bends wants to pop out. Thanks. 

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  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,002
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    Yes - I’ve only done a few Warmboard jobs and recall that that happened. We tacked down the bends with flat stakes until the silicone dried. 
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    kcopp
  • kcopp
    kcopp Member Posts: 4,432
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    I also used some silicone....however they say in the directions to not do so... hence the confusion.
  • hot_rod
    hot_rod Member Posts: 22,131
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    I know some of the PAP tube was tricky to keep in the bends.

    You don't have an old Heatway/ Watts Radiant stapler around, do you:) That 1-1/2" crown Senco PW stapler worked well for keeping misbehaving tube in the groove.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    kcopp

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