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R-Value of wall

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by UglyStrike, May 6, 2012.

  1. UglyStrike New Member

    joined: Mar 9, 2012
    23 posts
    KY
    What R-Value do you need for a wall to be considered non-combustable?

    What about fire proof?

    Would 1/4" Wonderboard over 1/2" foil backed ceramic insulation (left over from insulating the chimney liner) meet the R-value requirement?

    Thanks
    UglyStrike, May 6, 2012
    #1

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  2. Pallet Pete Minister of Fire

    joined: Nov 27, 2011
    3,178 posts
    Ovid MI
    Pallet Pete, May 6, 2012
    #2

  3. fossil Super Moderator

    joined: Sep 30, 2007
    9,157 posts
    Bend, Oregon
    The term R-value is not used in the context of surrounding walls...only in the hearth beneath the appliance. Non-combustible and fireproof are basically synonymous. It is determined by the materials used, not the R-value.
    fossil, May 6, 2012
    #3

  4. begreen Super Moderator

    joined: Nov 18, 2005
    36,118 posts
    South Puget Sound, WA
    Yes, a sheet of sheetmetal with a 1" air space behind it, open at top and bottom qualifies for NFPA 211 protection.

    What are you trying to accomplish, clearance reduction or just peace of mind?
    begreen, May 6, 2012
    #4

  5. UglyStrike New Member

    joined: Mar 9, 2012
    23 posts
    KY
    More peace of mind. My mantel piece will be 1/2" on each side into the clearance area called for by the insert. I am OK on the height clearances. The Wife has to have this oak mantel. I can protect it with the wonderboard and insulation, then blend it in with tile. I just do not want to have anything burn. LOL
    UglyStrike, May 6, 2012
    #5

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