BMW: Vapour Barrier Weakness: Revisited

Discussion in '5 Series' started by Peter, May 2, 2018.

  1. Peter
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    Peter Site Supporter

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    http://bmwland.org.uk/index.php?threads/bmw-vapour-barrier-weakness.1155/

    Could be starting today with the same text as the referenced topic. Yesterday I noticed moisture on the 'driver's door' sill plate. "Here goes again" went through my mind. Sure enough, with rain overnight, the sill plate and under door was swamped with water.

    Certainly a weakness with BMW vapour barriers. Another door to sort out when I get time.

    Peter
     
  2. kleynie
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    kleynie WARLORD Site Supporter

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    Peter,

    Mine does not have vapour barriers as such, only foam insulation, but I guess that is waterproof in itself. I removed all of mine when upgrading my speakers, I have no had any issues that I know of since and I did not add any sealant, just used what was there. You can see in this picture that the sealant is quite thick and VERY sticky.


    20170805_184610.jpg
     
  3. mach one
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    mach one Site Supporter

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    sorry to hear that you are having issues with water ingress from the doors again

    this is a problem i had with two of my mondeos where water was pooling in the rear foot wells and it was the supposed waterproof membrane that was the issue
     
  4. Peter
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    Similar to yours, still comes adrift at the bottom, without being touched for any repairs.

    This was my rear door after using some seriously HD mastic to prevent it coming off again easily. Water leaked from the lowest point.

    F11 Vapour Barrier.jpg

    Peter
     
  5. kleynie
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    kleynie WARLORD Site Supporter

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    You got me worried now, should I have applied new sealant? Maybe your weather up there doesn't help.
     
  6. Peter
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    As I mentioned in my other thread, it could be partly influenced by the way I park on my drive. The driver's side gets more of the midday sun. It has always been driver's side barriers that fail. I suspect the few hot days we had a couple weeks back may have played on any weakness, or stress on the panel.

    Peter
     
  7. bishbosh
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    bishbosh

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    @kleynie when I installed my Gladen setup I had trouble removing the foam vapour barrier on the passenger door. A few months later I noticed that there was water on the passenger sill. The old seal didn't seal very well, it looked like it had split at the bottom - most likely due to my hamfisted attempt at removing and trying to re-seal.

    I bought a roll of the stuff from Amazon, removed the old seal from the door and foam barrier (hard to remove without ripping the foam!) and installed the new seal on the door, pressing carefully to ensure adhesion.
    Not had problems since.

    Beware the stuff turns your fingers black for days - so wear rubber gloves!
     
  8. kleynie
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    kleynie WARLORD Site Supporter

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    Yes, I know what you mean, my fingers are still black form using the stuff on my sons sunroof last weekend.
     
  9. Peter
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    Got a chance to repair the Vapour Barrier today. Sure enough, had come detached in the bottom corner, and up the side. Was very surprised to see it like the picture.

    Hopefully sorted with some decent mastic.

    Front Vapour Barrier Small .jpg

    Peter
     
    Last edited: May 13, 2018
  10. bishbosh
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    bishbosh

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    Wow, never seen anything like that. The mastic looks intact, as if the vapour barrier somehow detached itself from it?
     
  11. Peter
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    The mastic was still quite sticky, and would have probably held the barrier again, at least for a while. I believe it is as I've commented on before, the sun's heat (or moisture and heat) may be weakening the bond, allowing the barriers to let go. Always doors on the sunny side of the parked car. Not that we've had it really hot this year, (up here), maybe it simply weakens over several years.

    Peter
     
  12. Spuffington
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    Spuffington Moderator WARLORD Site Supporter

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    I think I've got the same problem looming on the nearside rear door - noticed a few times some misting on the rear scuff plate as I've opened the door to let my daughter into the car. Need to give it some attention methinks.
     
  13. Adie
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  14. Peter
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    Rear door is slightly easier than the front, as you don't have to remove the trim inlay, just the handle surround to get at the only torx screw.

    Worth reading up on the removal procedure, NewTIS will give you the right instructions.

    Peter
     

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