Hello!
We were given an old insert style stove (i.e one that is meant to be installed into a wall) and as we have a huge (terrible...) open fire place we installed the stove with gusto.
It doesn't work particularly well and we would like to try and insulate the stove and build a bit of thermic mass using cob and stone. This would involve filling in some of the space between the stove and the fireplace. We would be building two walls on either side of the stove each approx 50cm wide, 1m deep and 1m high , a wall behind the stove, perhaps 2m wide, 30cm deep and 1m high and perhaps 20 or 30 cm thickness over the top of the stove itself. The stove has a large glass fronted door with an ashtray and air intake below. On either side of the ashtray are two grilles designed (I think) to draw air under the stove and up the back. We will probably leave two open channels in the wall behind the stove to allow this airflow to continue.
So, thanks for reading! My main question is, given that the cob and stone will be supported on all sides, do we need to build it layer by layer waiting for it to dry or can we do it all in one hit? Also, could we then run a fire to dry it or would it be better to let it dry (eternally..??) naturally? Its not super hot here! Of course if anyone can see any improvements or errors in this idea please point them out, your eyes and minds are much appreciated
Thanks,
Monsieur Khechog