I've only quickly glanced at this discussion but want to warn:
1 - Papercrete burns in tests. Sort of like charcoal. It doesn't flame. It smolders. And it has to be treated with a LOT of boric acid to make it burnproof. The amount most people are using does help make it fire and insect resistant. But doesn't stop it from smoldering if you put and hold a torch to it for a couple minutes. And then it doesn't stop smoldering when you remove the torch. The heated area has to be cut out of the wall or brick to stop the burn from spreading.
So my thought is you don't want papercrete anywhere close to the primary heat source in a rocketstove.
2 - And I see others have covered this, I'll just join the chorus: For a rocket stove you want thermal mass, not insulation. Papercrete is not thermal mass. Get rid of the paper and it is thermal mass. The heavier and denser the mix, the higher the thermal mass. Thermal mass stores and slowly releases heat thus making your rocket stove an extremely efficient heater. Insulation blocks movement of heat or cold.
-- ken winston caine
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