Location: Salt Lake Valley, Utah, hardiness zone 6b/7a
posted 7 years ago
I have a small rocket barbecue made from pavers and an old portable 14.5" Weber kettle grill. I have considered using lava rocks, but it is so small the heat seems to distribute well enough -- and it didn't come with the charcoal grate. You can see it here:
He uses an angled gravity feed that takes wood chips. The bottom of the vertical pipe is open to provide primary air (I assume there is a grate involved). He has used lava rocks in the barbecue. It is not insulated, nor is mine. They both would likely work more efficiently with insulated combustion chambers/flues.
Location: Southern alps, on the French side of the french /italian border 5000ft elevation