• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • Pearl Sutton
  • Mike Haasl
stewards:
  • paul wheaton
  • Joylynn Hardesty
  • Dave Burton
master gardeners:
  • jordan barton
  • Greg Martin
  • Steve Thorn
gardeners:
  • Carla Burke
  • Jay Angler
  • Kate Downham

Papier mache and pure clay?

 
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I was thinking maybe one could build up a rocket mass heater and double bell system in papier mache (as the mold) and clay. Then burn away the Papier mache?
 
gardener
Posts: 1741
Location: Los Angeles, CA
474
hugelkultur forest garden books urban chicken food preservation
  • Likes 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
The challenge would be stability, as the expansion and contraction due to heat would be significant.  Would clay be stable enough if it wasn't kept absolutely pure and then fired in a kiln?  What you are suggesting is akin to a cob oven.  My concern is that if it cracks, you'd have a danger of a carbon monoxide leak.  Very dangerous.

But if it were professionally made and fired, like a kamado grill/Big Green Egg, it would be very stable and able to withstand the tremendous temperature extremes.  I'm waiting for the day when someone manufactures these professionally out of clay (again, glazed and fired like a Big Green Egg), with a tight gasket at the bottom that seals perfectly.
 
Posts: 95
Location: Near PG BC
22
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
You will probably find that you need sand or other fillers/aggregate mixed with your clay to minimize cracking. It probably would be a good idea to pre-score lines for it to crack without being destructive to the piece, otherwise if it is monolithic it will crack probably where it will cause a structural or leaky problem.
 
Mjølner Rankenberg
Posts: 5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Marco Banks wrote:
But if it were professionally made and fired, like a kamado grill/Big Green Egg, it would be very stable and able to withstand the tremendous temperature extremes.  I'm waiting for the day when someone manufactures these professionally out of clay (again, glazed and fired like a Big Green Egg), with a tight gasket at the bottom that seals perfectly.



But if you glaze it, won't the glaze just run on successive firings?
 
Please enjoy this holographic presentation of our apocalyptic dilemma right after this tiny ad:
Rocket Mass Heater Plans - now free for a while
https://permies.com/goodies/7/rmhplans
reply
    Bookmark Topic Watch Topic
  • New Topic