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  1. #1
    Join Date
    Sep 2009
    Location
    Arnold, MD
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    36

    Default expandable foam and furnace flue vent?

    expandable foam was around both plumb vent pipes and the furnace/hot water heater flue going through the roof. Vent boots were installed wrong and I was assuming they added this because of that but is it flammable ? around the flue vent?

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  2. #2
    David McGuire's Avatar
    David McGuire Guest

    Default Re: expandable foam and furnace flue vent?

    I agree. They sell 800 degree fire retardant silicone that would be a better choice. They use it a lot on some vehicle exhaust and BBQ grills and ovens and even some of the pellet wood stoves. There is also that fire rope caulk/gasket stuff that they use on gas and electric ovens, I think it is rated at 1100 degrees.


  3. #3
    Join Date
    Mar 2007
    Location
    Oregon
    Posts
    2,365

    Default Re: expandable foam and furnace flue vent?

    Quote Originally Posted by biglebowski View Post
    expandable foam was around both plumb vent pipes and the furnace/hot water heater flue going through the roof. Vent boots were installed wrong and I was assuming they added this because of that but is it flammable ? around the flue vent?
    Looks like a bad install for sure. Someone was likely trying to prevent leakage after a bad flashing install (not going to work) or prevent drafts (dumb idea) or ?????

    btw.... welcome to the board. I like your name and loved the movie (my favorite scene was 'the dude' getting his head shoved in the toilet). You'll likely get better answers and generally more help around here if you post your real name.


  4. #4
    Join Date
    Sep 2009
    Location
    Arnold, MD
    Posts
    36

    Default Re: expandable foam and furnace flue vent?

    Quote Originally Posted by Matt Fellman View Post
    btw.... welcome to the board. I like your name and loved the movie (my favorite scene was 'the dude' getting his head shoved in the toilet). You'll likely get better answers and generally more help around here if you post your real name.
    thanks, ya movie is hilarious, would be great if they had a sequel . i didnt know my name mattered but ill change it if i can


  5. #5
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default Re: expandable foam and furnace flue vent?

    Going back a step: is that b-vent?

    1) If not, it's wrong, you can't vent through an unconditioned attic with single wall.

    2) If so, it's wrong, you can't have any material - flammable or not - other than another appropriate portion of the listed vent assembly in contact with the pipe at that location.

    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

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