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  1. #1
    John Stephenson's Avatar
    John Stephenson Guest

    Default Great Foam Insulation

    Great foam insulation was used to seal the ceiling gap in the furnace closet around the vent firestop collar. I read on the can that it is not rated to be near combustible material. At this location, would you say that being located near and on the firestop collar is wrong?

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  2. #2
    Join Date
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    Spring Hill (Nashville), TN
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    Default Re: Great Foam Insulation

    Quote Originally Posted by John Stephenson View Post
    Great foam insulation was used to seal the ceiling gap in the furnace closet around the vent firestop collar. I read on the can that it is not rated to be near combustible material. At this location, would you say that being located near and on the firestop collar is wrong?
    I think that you have already answered your question!

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3
    Mike Huppi's Avatar
    Mike Huppi Guest

    Default Re: Great Foam Insulation

    Yes you answered your own question


  4. #4
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    Default Re: Great Foam Insulation

    It is also a situation that I would notify the current resident or I would note in my report that the current resident should be notified.

    The only reason some people get lost in thought is because it's unfamiliar territory.
    - Paul Fix

  5. #5
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    Default Re: Great Foam Insulation

    Assuming (as there is no picture) that the collar was designed to be in contact with flammable material where it met a wall or ceiling, why would a bead of foam caulk - assuming (again) that it was a bead, and not an attempt to flood the junction and overflowing into or behind the collar - be a problem?


  6. #6
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    Default Re: Great Foam Insulation

    Yes, but what's the difference between Greatstuff and any other "combustible" material in contact with the collar? After all, it can be used for some fireblocking applications:


    http://tinyurl.com/2hoy2e


  7. #7
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    Cool Re: Great Foam Insulation

    Need to differentiate here.

    If it is touching the vent pipe or encroaching in the stated clearances, it needs to be removed. If it is being used as "fireblocking" and is accepted by the local AHJ such as sealing stud bays, gaps in the fireblocking not near the vent components, I would say it is ok. If you tried to foam around a listed firestop assembly where it meets the ceiling or fireblocking, I would be concerned it oozes into the stated clearanc zone. Otherwise, I wouldn't lose too much sleep over it. Are they caulking the B-vent with it to the thimble/ ceiling firestop?

    Another aspect is the mass. If you have a huge glob of foam, it will absorb much more heat than a thin cauling bead. For future reference, I would suggest they use high temp. silicone caulk for draft stopping near hot things.

    Keep the fire in the fireplace.

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