Cob: suggestions??

[W]

I've seen clay flue liners used inside cob chimney, in a cob house on Mayne Is., BC, built by a Cob Cottage Company & Cobworks collaboration.  There was some reason that the chimney needed this lining, although Ianto's Rumford fireplace design just used a high sand mix to line the fireplace (firebricks for the floor).  After firing, the inside of the fireplace was rock hard.  I'm not sure if the flue liners were necessary, but they seemed to think so.

One problem with encasing a metal stove (or stovepipe) in cob is that the metal will expand and contract at a much higher rate than the cob, which could be problematic.
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On Wed, 2 Oct 2002 20:27:43   
 Shannon C. Dealy wrote:
>On Wed, 2 Oct 2002, Aile Eagle Bear wrote:
>
>[snip]
>
>> good sand/clay soil mix where I live  so have merely added some lime to
>> soil and added water...mixed and shaped....)  I have a short pipe with
>> draft control... and plan to place cob around this three feet of
>> pipe...then form rest of pipe with cob... also I thought I would try and
>[snip]
>
>Don't know how well this will work, but I think you would be better off
>using stove pipe inside of the cob for the entire run rather than trying
>to form a pipe out of cob.  The stove pipe will give you a form to work
>around, and will prevent any exhaust from the stove getting out into the
>room.
>



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