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Perlite Cob Mix for Rocket Mass Heater

 
Sean Engman
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I'm trying to plan out a rocket mass heater for my house. My house is two stories with a basement. I've seen people using a perlite cob mix for the insulation layer beneath the rocket mass heater. Can I use the perlite cob for the bench of my rocket mass heater assuming that it isn't used as an actual bench. I know that the perlite does not have enough compression strength for that. What I really am trying to do is lighten the load on my wood floors. I'm still planning on Shoring the structure up. Any help and input would be great. I just want to make it as light as possible to reduce the stress from the heavy load.
 
Sebastian Köln
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As you need the mass for thermal storage, can you build it above or in a wall?
Regarding the stability of clay/perlite: As long as you cover it with a thin layer of normal clay (5mm), it is incredible strong. Unless you want to put a grand piano on it, I don't think compressive strength would be an issue.
 
Mark Brunnr
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The perlite is mainly for insulation, so it's good around the burn tunnel and under the mass if you want to isolate it from the floor, but definitely a bad thing to have in your mass, as it reduces the heat-absorbing ability. Can you use a brace underneath the mass?
 
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