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Wood ash insulation  RSS feed

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Location: Transylvania
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Hi everybody ,please be patient with my English,is all I have for the moment.
More I read or watch videos about rocket mass heaters more I like the idea to make one,but of course like any beginner will start with questions.
I have done one rocket stove for cooking ,three or for ears ago,is doing he's job very well .I use wood ash for insulation.
Could be wood ash a good insulation for a heat riser in a mass heater?
Or could be wood ash one component in a homemade refractory mortar recipe?
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Wood ash is mostly oxides of potassium, calcium, phosphorus. It will certainly be good insulation. Be careful working with it. It can be very corrosive and burn your skin. Be sure not to breathe any of it.
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Location: Ladakh, Indian Himalayas at 10,500 feet, zone 5
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I've been thinking the same question since I started reading about rocket mass heaters. We wouldn't have access to perlite or vermicultie and would have to do homemade low-tech insulation in the riser. Does plain wood ash work? Or better mixed with something?

A friend wondered if a small amount of sawdust in cob would burn away leaving holes to form insulation?
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Would you replace your oven with a rocket oven?
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