Build a brick rocket stove: Is it safe to use concrete blocks?

love this!

PermaculturePower

Posted on October 12th, 2014 by Leon in Survival Equipment

“…“I spent many years in masonry construction. Chimneys and fireplaces were our specialty.
“Fireplace construction uses firebrick for the firebox and ceramic flueliners to carry the heated air out of your house.
It would take very intense heat for a concrete block to “explode”. (Think cutting torch temperatures). Over time,they will deteriorate with heat. As mentioned below, the yellow fire brick, or chimney brick, is the only brick to use. They do not absorb heat. Not sure on the cost but it would be money well spent.
“If you are just occasionally using a rocket stove, you should be ok with regular brick/block.
“Also, if you are building a “permanent” rocket stove, don’t use regular brick mortar for the fire brick. You will need a small bag of “fire clay”. You mix with water just like mortar…”

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