Win a copy of The Tourist Trail this week in the Writing forum!
  • 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:
  • Joseph Lofthouse
  • Jocelyn Campbell
  • Mike Jay
garden masters:
  • Steve Thorn
  • Dave Burton
  • Joylynn Hardesty
gardeners:
  • Carla Burke
  • Pearl Sutton
  • Greg Martin

thermal battery and cob

 
Posts: 9
  • Mark post as helpful
  • send pies
  • 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?
 
gardener
Posts: 2967
Location: Upstate NY, zone 5
128
  • Mark post as helpful
  • send pies
  • 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.
 
Something about .... going for a swim. With 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!