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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.

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    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 '20 at 16:37
  • Fire stopping in studs or going up / down through plates? A photo may be helpful.
    – Ed Beal
    Apr 6 '20 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 '20 at 18:23
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    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 '20 at 19:01
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The MDS notes that the components are latex polymer, water and CaCO3 (calcium carbonate). These are inert and should not interact with the sheathing.

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    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 '20 at 12:54

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