mrtee
New Member
Posts: 2
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Post by mrtee on Oct 30, 2019 7:58:23 GMT -8
Hi folks, I will soon start building my RMH using Peter's designs. Aiming for the 17'' version. There is one think that is still unclear: can the double skin in the top part of the bell be replaced by single sking made from firebrick? Or there is a high risk that will crack as well?
Thank you all for your effort and knowledge.
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Post by satamax on Oct 30, 2019 13:30:05 GMT -8
It will crack.
If you want to save on bricks or weight, metal inner skin, brick outer skin.
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mrtee
New Member
Posts: 2
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Post by mrtee on Oct 31, 2019 4:46:33 GMT -8
Thanks a lot
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Post by independentenergy on Oct 31, 2019 8:07:50 GMT -8
my batch box has a single wall for the whole stove and, yes, it does crack. I used the flat brick so the wall is 110mm thick. I gave the plaster I let it crack and then another plaster remained two small cracks.If you can use fiberglass mesh in the plaster
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Post by Karl L on Nov 15, 2019 3:02:00 GMT -8
It will crack. If you want to save on bricks or weight, metal inner skin, brick outer skin. Thanks for that advice - is there a gap between the metal inner skin and the brick outer, for expansion of the metal? How big should this gap be?
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Post by Karl L on Nov 15, 2019 3:04:03 GMT -8
my batch box has a single wall for the whole stove and, yes, it does crack. I used the flat brick so the wall is 110mm thick. I gave the plaster I let it crack and then another plaster remained two small cracks.If you can use fiberglass mesh in the plaster Does the brick skin crack in many places, or in just a few? The original question was about the top of the bell - are you getting cracks in the top or everywhere? Thanks!
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Post by independentenergy on Nov 15, 2019 15:21:03 GMT -8
in my case there were three cracks and only on the upper part and not the brick but the refractory mortar was cracked two were repaired with plaster and mesh
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Post by Karl L on Nov 16, 2019 11:51:04 GMT -8
in my case there were three cracks and only on the upper part and not the brick but the refractory mortar was cracked two were repaired with plaster and mesh Thanks :-)
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