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  1. #1
    Join Date
    Oct 2006

    Health problems associated with mastic

    Mastic is used in my area to seal duct board transitions from the inside. An example would be attaching an air handler to the plenum in a closet. Since tape cannot be applied to the back seams. Mastic is applied on the inside of the duct board to seal the transition. Does anyone know of health concerns with mastic on the interior. It is made as an exterior duct sealant. The reason I ask is local companies stopped applying it to the inside of ducts because of a lawsuit.

  2. #2
    Join Date
    Mar 2005
    Houston, Texas
    Email whoever manufactures it. I would think they thought about these potential problems before they sold it.

  3. #3
    Join Date
    Sep 2002
    I don't know
    Here you go -

    Seems pretty safe to me.
    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

  4. #4
    Join Date
    Jan 2004
    Find out what the lawsuit damage claim was.
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    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    May 2007
    Naples, Fl
    Mastic is for sealing the air barrier correct? Applying the mastic to the interior surface of ductboard will not seal it. Why because air will flow throw the fiberglass. If you want to seal from the inside you have to cut down to the air barrier, seal and then put the fiberglass back. John Dooley from the Florida Solar Energy Center is/was the duct seal maven in Florida.

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