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    confusedalways's Avatar
    confusedalways Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 31, 2012, 06:38 AM
    Duct Sealing question
    Just trying to solve a question. After sealing ducts with foil tape, could you then cover that with mastic? Would this application cause a failure in the tape adhesion? By the same thought once mastic is applied would you use foil tape over it?

    Any thoughts would be appreciated
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Jan 31, 2012, 12:51 PM
    Mastic, I looked the word up,and what I saw it doesn`t sound like something I would want to put around my ductwork. maybe better explain would help.;)
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #3

    Jan 31, 2012, 05:04 PM
    Either foil tape, or mastic duct seal is fine, but I wouldn't use them together. I would suggest using duct seal, as it will hold up longer when properly applied. Why would you use them together? Never heard of that before.

    I would think that putting duct seal over foil tape could cause the tape to moisten and not hold. And I don't think foil tape would stick on top of wet or dry mastic. That make sense?
    thermalmedics's Avatar
    thermalmedics Posts: 153, Reputation: 13
    Junior Member
    		  
    #4

    Feb 29, 2012, 02:45 PM
    We do a lot of installs and use screws, foil tape then mastic (we call it pookie). Just make sure the pookie covers all of the tape and has a solid sheetmetal area to cling to. It holds up great in AZ with 140 degree attics. If you need extra bonding in the pookie there is a mesh you can use. It is almost like what the drywallers use on thick joint compound.
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