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Wood ash insulation  RSS feed

 
Posts: 5
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?
 
pollinator
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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.
 
gardener
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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?
 
Posts: 45
Location: Northern michigan
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building solar woodworking
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I've been having a similar thought of using wood ash to insulate a wooden floor from the Heat
 
gardener
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Safest thing is to build it up off the floor.     There was a builder in new England a yearor two ago, who thought he could get away with cement board on the floor with cob over that...   A few years later he removed his entire rmh and went with conventional heating.   Seems his nice hardwood floor was charred and burnt …  not the rmh fault but the building method... Please don't make that mistake.
 
pollinator
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Hello Ryan,
The following thread has a build by Kirt Mobert where he uses wood ash as a natural refractory mix Batch rocket

Kirk said: "I think i should point out that the firebox of this stove is a homemade mixture that consists of crushed red brick (grog), wood ash, cow manure and locally sourced clay soil."

EDIT: The first few pictures shows how the stove is raised off the floor before the wood ash mix is used.  
 
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