So I have a pipe penetration problem at the gas pipe. I hired a contractor and he decided to use great stuff to seal the gap. Would it be a fire safety problem?


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    Code may say something about this, so just a comment: If you have a fire safety problem due to the foam being flammable around a gas pipe then I think you have bigger problems - i.e., why is there a fire near a gas pipe in the first place? – manassehkatz Sep 16 at 3:07
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    What is this pipe penetrating through? – ThreePhaseEel Sep 16 at 3:11
  • That's a really good question. – Harper Sep 16 at 3:39
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    Depends on the color of the foam... Great stuff does make foam for fire blocking and it is a orangey red color. If it is not red, then it is no good – Gunner Sep 16 at 12:37
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    Correct. The only issue is whether or not the wall is fire rated or not, and in residences, that is usually only the wall separating an attached garage and the rest of the house. The "Fire Rated" foam filler is different in that it is "intumescent", a term meaning that when fire hits it, it chars and expands, robbing the fire of further fuel to penetrate (for a specific amount of time). If you have ever played with the "snake" fireworks, that is a perfect example of an intumescent material. The orange color signifies that the material is rated as a fire stop material. – JRaef Sep 16 at 18:58

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