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Rocket mass heater foundation  RSS feed

Posts: 7
Location: Corinth, KY
forest garden fungi homestead
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Another question about RMH. I have a concrete slab that I will be building on for my RMH. The concrete has not been sealed. Do I need to seal the floor before I install the RMH? As a cob builder I avoid concrete because concrete wicks moisture but won’t be able to seal my floor until later this month and I would like to install the heater before it gets too cold. Thanks in advance!
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Location: latitude 47 N.W. montana zone 6A
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Hi Diane;  The important question) is  the floor insulated from the ground ? Under your rmh there will be no extra moisture for the concrete to steal.

So, in answer to your question. No, the floor does not need sealing.

On to my question , is this concrete insulated ? If your answer is no ... then you will want / need  4" of insulated cob under your core and mass.The concrete will soak up your heat and transfer it directly into the ground.  You can't run your stove long enough to heat the earth ....
If the answer is yes, it is insulated well... then your golden ! Build away!

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