I am helping my brother with his unfinished basement when I realized he made a mistake. I told him to use a fire stopping sealant in certain stud holes where Romex wire was being fed through.

Unfortunately he used the wrong sealant, he used saint-gobain's acoustic soundproof sealant (i.e: Green-Glu).

My primary concern was "Would there be a negative reaction from the soundproof sealant coming into contact with the Romex sheathing" (i.e: Would it damage the sheathing or is there any serious risk)

I reached out to Saint-Gobain for more information and couldnt get a straight answer (which is understandable)

Saint Gobain - "We do not have any information on using with wires and I don’t expect our sealant will provide an acoustical function in contact with the wires, and it could be a safety issue if a fire develops in one cavity as this is not a fire blocking material."

I plan on trying to remove some of the sealant and replace with a fire stopping sealant but there are areas I simply don't have access to. To anyone's knowledge is there any serious risks here? Should I be concerned with the Romex Sheathing having any negative reactions to the sealant?

Its worth nothing: - The only "official" reported negative reaction I could find is when it comes into contact with copper. They also state it can be used around plastic junction boxes.

  • 1
    I don't think there will be any reaction, but fire-proof sealants are usually used where they are required by code, so if you didn't use them in a code-required place it seems like that would be the primary concern (won't pass an inspection).
    – JPhi1618
    Apr 6, 2020 at 16:37
  • Fire stopping in studs or going up / down through plates? A photo may be helpful.
    – Ed Beal
    Apr 6, 2020 at 17:59
  • @EdBeal - Let me know if this makes sense or if I made it worst: evanwowk.com/clao_new/wp-content/uploads/2020/04/…
    – Andrew
    Apr 6, 2020 at 18:23
  • 1
    Ok I can see the sub floor one as being needed , the horizontal one? What’s on the other side of that stud ? Garage or living space then it would need sealing. Horizontal runs don’t normally need sealing unless they connect multiple rooms.
    – Ed Beal
    Apr 6, 2020 at 19:01

1 Answer 1


The MDS notes that the components are latex polymer, water and CaCO3 (calcium carbonate). These are inert and should not interact with the sheathing.

enter image description here

  • 1
    1~ week test. Although testing a little over a week is no real "timeframe" Ack is correct. The components are inert and initial looks showed it had no negative effects on the romex. I was able to peel it off the romex with no issues at all. I am going to assume other then the issues discussed above there is no serious harm in this.
    – Andrew
    Apr 9, 2020 at 12:54

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.