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Follow-up Question re: Damper Block-Off Plate

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by daninohio, Jun 16, 2006.

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  1. daninohio

    daninohio New Member

    Joined:
    Jun 3, 2006
    Messages:
    57
    Loc:
    Cincinnati, OH
    You may remember my questions about the Jotul insert last week.

    To recap, when I asked about the liner, the dealer said it was uninsulated 316 and that he just used a top plate to seal the system.

    You all heartily recommended using a damper block-off plate down below as well.

    I stopped back in their shop today to ask if there would be any problem installing a damper block-off plate and how much that would cost. They said it would be no problem and would probably cost about $45 or so. As we talked about it though, he mentioned this time that they include insulation down below around the damper -- so he said the function of the damper plate is covered by the insulation. I don't know what exact type of insulation they use.

    So my question is whether I need to insist on a damper block-off plate or if the insulation is sufficient?

    Many thanks in advance for the help.

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  2. Shane

    Shane Minister of Fire

    Joined:
    Nov 21, 2005
    Messages:
    1,830
    Loc:
    Casper Wyoming
    Edited.... You should insist that the metal block off plate be used. It is the best method and is the method outlined in NFPA211. I apologize if the previous post was interpreted to advocate insulation block off plates.
  3. webbie

    webbie Seasoned Moderator Staff Member

    Joined:
    Nov 17, 2005
    Messages:
    12,331
    Loc:
    Western Mass.
    Although the insulation may partially do the job, keep this in mind:

    1. Insulation is not designed to stop air flow, just heat.
    2. Most insulation releases fibers on a constant basis unless closed in.

    #2 might be fine if you have an insert, but if it is a stove you are best with a metal plate as close as possible to the level plane about 2" up from the bottom of the lintel that hold the front bricks up.

    See this article
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