PEX versus Polyethelene

Discussion in 'Irrigation' started by PJNTJ, Sep 28, 2011.

  1. PJNTJ

    PJNTJ LawnSite Member
    Posts: 15

    Why don't irrigation installers use PEX instead of regular poly? Based on what little research I've done PEX is superior in every way, except for sunlight damage which isn't really a concern. PEX is becoming so much the standard now that I see its cheaper than poly. I can't be the first person to think of this, there has to be a reason besides "we use poly or PVC because that's what we've always used and that's the way it is".

    Cross-linked Polyethelene meets ASTM standards for heat, cold, pressure, etc etc, certified for outdoor use, cold weather, etc, etc, seems far superior to poly. What am I missing here?

    Thanks for your opinions.

    Paul
     
    Last edited: Sep 28, 2011
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,494

    Sunlight damage is an immense concern. :hammerhead:
     
  3. PJNTJ

    PJNTJ LawnSite Member
    Posts: 15

    In the northeast we don't get any sunlight 16 inches below ground.
    :)
     
  4. irritation

    irritation LawnSite Gold Member
    Posts: 3,149

    Ease of installing fittings. I've never seen a saddle for pex.
     
  5. PJNTJ

    PJNTJ LawnSite Member
    Posts: 15


    Sharkbite fittings are press and pull. Parker has the Prestoloks, etc, etc. I suppose those would be a little more cost prohibitive, but there's a lot of fitting companies out there these days. I'm still thinking...
     
  6. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,494

    Just why are you worried about poly pipe at a burial depth of 16 inches?
     
  7. PJNTJ

    PJNTJ LawnSite Member
    Posts: 15

    I'm not actually, I want to go much more shallow, I was throwing that number out there to act like a tough guy. Freeze/thaw cycles is actually my main concern, which is why I'm looking at all PEX versus poly. I can't find many drawbacks.
     
  8. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,494

    Freeze thaw is why you don't consider PEX, because it is a phenomenon (frost and heave) that can bring pipe to the surface, where it is exposed to sunlight.
     
  9. PJNTJ

    PJNTJ LawnSite Member
    Posts: 15

    ok, yea, I'm new but your messing with me right?? :dizzy:
     
  10. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,494

    You would have to be new to not know that sprinkler pipes not covered by a lawn can work their way to the surface, in freezing climates.
     

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