• 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 pie forums private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • jordan barton
  • Pearl Sutton
  • Leigh Tate
  • paul wheaton
  • r ranson
  • Nicole Alderman
  • Greg Martin
master gardeners:
  • Carla Burke
  • John F Dean
  • Jay Angler
  • Nancy Reading
  • Mike Barkley
  • Christopher Shepherd

thermal battery and cob

Posts: 9
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
As I build the TB from the ground up like " layering lasagna " I plan on building a structural straw cob retaining wall on the unsupported side of the bench ( other side is against a concrete wall )
1. Is this necessary for retaining a clay slip rock / brick / pea gravel TB ?
2. It's still not clear to me whether or not it is good to finish a TB with a layer of insulative material.
3. How thick?
4.Ratio of straw to clay slip by volume?
Posts: 3623
Location: Upstate NY, zone 5
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
As long as the fill is going to be solid (no loose pea gravel), I don't think you need to worry much about a "retaining" structure. I wouldn't say an insulating facing would be helpful, but a structural cob mix with enough straw to make it strong would be a good semi-final step. (Followed by whatever finished surface you want to make.) Experiment with various ratios of the clay and straw you plan to use, and see how much you need for a good effect. You can always rewet the test materials and reuse them in the mass core, on the bottom if you think they are too insulative.
My cellmate was this tiny ad:
Rocket Mass Heater Jamboree And Updates
    Bookmark Topic Watch Topic
  • New Topic