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  1. #1
    Join Date
    Mar 2009
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    Default rims joist insulation foam need a fireBlock?

    Howdy reading about how one needs to protect foam insulation from the spread of fire... So when i install 2" of foam between the floor joist do i need to then install a fire blocking ? Then i plan on installing fiberglass batts to reduce the heat loss threw the floor into unfinished basement.
    Last edited by Timothy Miller; 12-15-2011 at 12:16 PM. Reason: typo
    Any an all of my comments are just my opinion and not to be confused with facts.

  2. #2
    Join Date
    Aug 2007
    Location
    Maryland
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    1,694

    Default Re: rims joist insulation foam need a fireBlock?

    I don't have access to the building code at the moment, but I know thw latest IRBC does not allow exposed foam in an attic, so I assume it wouldn't be allowed in a basement. Coverage can be minimal with metal, plywood or gwb.

  3. #3
    Join Date
    Aug 2007
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    The Great White North
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    4,045

    Default Re: rims joist insulation foam need a fireBlock?

    Quote Originally Posted by Timothy Miller View Post
    Howdy reading about how one needs to protect foam insulation from the spread of fire... So when i install 2" of foam between the floor joist do i need to then install a fire blocking ? Then i plan on installing fiberglass batts to reduce the heat loss threw the floor into unfinished basement.
    Yes , you have to cover the exposed foam with a fire rated material like drywall for example.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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