• 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 experiences global resources the 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
  • paul wheaton
stewards:
  • Jocelyn Campbell
  • Mike Jay Haasl
  • Burra Maluca
garden masters:
  • James Freyr
  • Joylynn Hardesty
  • Steve Thorn
  • Greg Martin
gardeners:
  • Carla Burke
  • Dave Burton
  • Pearl Sutton

RMH Exhaust Materials

 
Posts: 104
Location: Southern Manitoba, Canada, Zone 3B
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I was just sitting her thinking about the different materials involved in making an RMH. Then I was thinking about the discussion about using metal for the exhaust. Is this necessary? Does it need to be metal?

Why not just use cob?

Is there a structural reason? Safety? Is there a risk that the whole thing might collapse one day and spew fire?

How about using something like Sonotubes (cardboard tubes for doing fencing, deck foundations, etc) to make the form. Cover the whole thing with good cob or a suitable alternative. Light it and let her burn. The paper tube would of course burn, but would not the cob cure and harden creating a permanent exhaust?

Of course this makes me think of the saying "curiosity killed the cat". Am I the cat?
 
            
Posts: 79
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
A metal liner will help prevent your cob from cracking and possibly collapsing.  Without such a liner, if it collapses, you have to start from square one and rebuild the system  With a liner, you just have to patch the cob.
 
You've gotta fight it! Don't give in! Read this tiny ad:
A rocket mass heater heats your home with one tenth the wood of a conventional wood stove
http://woodheat.net
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!