Q&A R-Value of fireplaces

QandA Posted By QandA, Nov 24, 2007 at 3:50 AM

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  1. QandA

    New Member 2.
    Staff Member

    Nov 27, 2012

    I am an architecural engineering student designing the heat load and
    cooling loads in a house for one of my classes. In our house there is
    to be a fireplace of our choice. My instructor directed me to the
    internet to find an R-value for any fireplace, but I can't seem to find
    any manufacturer that lists this for their products. Can you give me any
    product and an R-value for it?


    There are two types of fireplaces, factory built (metal) and masonry (usually site built).

    Metal fireplaces are installed inside a structure, so they do not provide an insulating factor by themselves. Many are simply two pieces of sheet metal with an air space between them, so they are of little R value.

    Masonry fireplaces differ in construction. Many use an outside layer of 6" block, which might have a brick veneer on the outside...or it could just be stuccoed. Inside, a layer of firebrick completer the firebox. An airspace may also be present. Pourable insulation is sometimes used in the outside blocks, which would increase the insulation factor.

    Since these are site built, a specific R factor would be hard to give, but I'm sure you can figure one out based on these specs. You could also try the masonry links at http://www.rumford.com

    Link: Masonry Links
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