Robin De Schrijver

Hello all,

My rocket mass heater has some issues at the burn chamber level, the cob around it always cracks in the same spot and some refractory bricks keep getting pushed inwards, partly blocking the burn tunnel.
Has anyone else encountered these problems?
Would using refractory cement as mortar for the refractory bricks work as a solution?
I have tried using regular cob as mortar for the bricks but it just burned away so now I had them dry stacked and encased in cob/ straw.

Thanks.

Maybe look into landscaping businesses for hardwood chips?
Pretty sure goat poop makes for a good Agaricus compost.
The french love their champignons de paris.

Quick question,

Can you get away with a 90 degree bend at the very start of your flue?

Thanks y'all.