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wirsbo blisters

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arne 53
arne 53 Member Posts: 14
in Radiant Heating
I have inherited a job with Wirsbo 1/2" hePEX sandwiched in a floor between plywood. When we took up a piece of wood the tubing below had numerous blisters, like little bubbles in the pipe, in some areas. The blisters appear to be only on the surface just under a thin layer of some material. We had just put water to the tubing about a week ago and the tubing we could see looked OK. Has anyone ever seen this and should I be worried?

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  • MechTech_2
    MechTech_2 Member Posts: 84
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    Same issue

    with a job I had under 50 psi air for one year, and air pockets were forming under the co-extruded oxygen barrier. I guess the oxygen barriers do work. Also, I've seen pockets on the pipe right out of the box, apparently the co-extruded barrier not adhering properly during mfg., but barrier still in tact. 
  • arne 53
    arne 53 Member Posts: 14
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    wirsbo blisters

    Is there a time limit for air pressure testing? Mine also was under air pressure for about 9 months. The main question I have is the tubing and oxygen barrier OK, even with the blisters?
  • NRT_Rob
    NRT_Rob Member Posts: 1,013
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    we saw the same thing

    on a different brand of pipe. shouldn't hurt anything.
    Rob Brown
    Designer for Rockport Mechanical
    in beautiful Rockport Maine.
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