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Community and Q&A

Acoustical sealant for poly sheeting

mtbphoto | Posted in General Questions on

Hello, I am installing 6-mil poly sheeting over unfaced fiberglass batts in my Zone 6 home. No AC only heating. I know I have to use an acoustical sealant at the seams of my poly sheeting but am having a hard to deciding which product. I see that Tremco Acoustical Sealant is the go to, but I am having a hard time finding it and also hear it will stink for a long time and is a mess. Looks like the easiest stuff to source is the OSI SC175 and Titebond Greensource acoustical.

Anyone had any luck with these other products? Anything else I am missing?


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  1. Expert Member
    BILL WICHERS | | #1

    Smart vapor retarders like membrain and intello are safer than polyethylene sheet.

    I would use urethane sealant around the perimeter (to seal the sheeting to the framing), and 3M flashing tape to seal and joints between sheeting sections wherever you can’t use a continuous piece. I wouldn’t use acoustical sealant for a vapor retarder/barrier sealing application like this.


  2. Expert Member
    Akos | | #2

    I've used a PL sealant that is very close the OSI and Titebond. Much friendlier than standard black acoustical sealant. Not as sticky but much easier to clean up. If you are putting the drywall up right after the VB, either one would work. If you will let it sit for a couple of days, these sealants will harden so make sure you smooth the edges flat.

    The black stuff is great as it will stay flexible and never set, but it is a pain to work with. It will also get on everything near it so make sure you change your clothes before you get into your car or sit on a chair you care about.

  3. mtbphoto | | #3

    Thanks for the responses. I feel like it is wasting money to buy a smart barrier, as I live in a pretty dry climate. Sierra Nevada mountains California, cold snowy winters, dry summers.

  4. pnwbuilder | | #4

    I have 7 or 8 29 Oz tubes of Tremco left from last year when I've used it for sealing sill plates. Let me know if you are interested.

    1. mtbphoto | | #5

      Hello Vlad, I don't see a way to message you privately here, so could you email me please? Wesley.Pracht at Gmail


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