First timer · Cob & Natural Building School

First timer

I wanted to start small for my first cob project so I decided to try a little rocket stove.i made the bottom tray first with a perlite clay mixture. I ran out of materials before I finished the “J tube” and the ground has been covered in snow so I can’t get more. I am wondering if the crack is because I didn’t add enough sand? Or too much straw? Thanks for any suggestions.

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