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  1. #1
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    butyl tape for vapor barrier

    My dealer said to go to any hardware store and get 3M butyl tape. Well there appear to be about 1000 kinds. Can someone give me the specifics of the type and size? Thanks.


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    Go to a shop that sells auto paint to the trade>>

    you'll get the right stuff, but you'll have to buy a good bit of it.
    Ed in San Jose. BMW CCA member since 1987 (Nr. 62319). Golden Gate Chapter. '97 540i 6 speed. Build Date 3/97. Aspensilber over Aubergine leather.

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    I've just bought 2 rolls (made in Japan) from

    this company. It's expensive but top notch.
    http://crawlspaceinfo.com/DrySpace_Tapes_Fasteners.htm



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    Re: butyl tape for vapor barrier

    Funny. You can find 1000 kinds at any hardware store and I had to search all over God's green Earth to find any at all.

    True butyl tape is pretty old school. I only saw three parameters that changed: 1/ total length 2/ profile (round, square) 3/ diameter Fo the vapour barriers it isn't really critical. It squishes flat and sorta sticks the foam down, so: 1/ whatever amount you think you'll need with each use being a circuit of the door 2/ doesn't matter 3/ not critical, say 1/4" or 3/8"?

    There are other materials which are more modern like 3M Windoweld and many others. These aren't strictly butyl tape and I don't know if they are more or less removeable and whether they'll cause you to shred the vapour barrier when you try to remove it the next time.

    I have found my butyl tape to be not all that tacky. I always have to use a heat gun to preheat the door and then continue to heat the vapour barrier and push and squish. Careful not to melt the vapour barrier itself.

    I haven't tried it, but I've always thought that "acoustic sealant" (used to bond vapour barrier to base plates or studs in home construction) may actually have better properties for this job. It comes semi-liquid, goes on with a caulking gun, never hardens, it will bond things together without being "sticky" and attracting everything. It's also really simple to find at any hardware store.

  5. #5
    Crusader
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    3M window weld 15' roll


  6. #6
    Kevin S.
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    Re: butyl tape for vapor barrier

    Thanks to all for the advice. I'll get somne round 3/8" stuff and go from there.

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