Win a copy of 5 Acres & A Dream The Sequel this week in the Homestead 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 skip experiences global resources cider press projects digital market 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
  • paul wheaton
  • Joylynn Hardesty
  • Dave Burton
master gardeners:
  • jordan barton
  • Greg Martin
  • Steve Thorn
  • Carla Burke
  • Jay Angler
  • Kate Downham

rock or steel or urbanite in mass ?

Posts: 3635
Location: latitude 47 N.W. montana zone 6A
cat pig rocket stoves
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi All ; Still working on my rmh, and i'm looking ahead to my mass. I understand encasing my flue pipes in solid cobb , to form a natural tunnel in the cob. I had been planning on using local rock and some urbanite from the landfill as (filler) in my mass. Today I noticed my scrap metal pile... Is it better ? as good ? or a bad idea to bury brake drums , rotors , cly heads, some are alluminum ? in my mass ? I have many years worth of scrap metal i could bury and i also have large amounts of shale that i could use and the local landfill has vast piles of concreat. what one would make the best filler ? I'm still working on my horizontal transition area but thinking ahead. Thanks for any advice. tom
[Thumbnail for DSCN1747.JPG]
[Thumbnail for DSCN1746.JPG]
[Thumbnail for DSCN1748.JPG]
Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
hugelkultur fungi books wofati solar woodworking
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
T.R. : Mere cob,which is what you want in close contact with your - everything! weighs 1/2 of most rocks, the more they weigh, the faster heat travels through them, a big hunk of
very dense material close to your horizontal pipe and the top of your bench can and will make a hot spot, this said don't forget to apply a thin layer of Clay Slip between each and
every layer to achieve good contact and bonding between layers. (use a paint brush ! )

I would be very tempted to put my mass as low as Icould get it, but if that moved the horizontal pipe higher in the Thermal Mass Then I will get prompt heat Quickly but less long
term storage, More dense material will hold more heat, the only tradeoffI can see is, will I ever want to tear into it to make ?Repairs ? Have fun with this Big AL !
Posts: 50
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I just posted a blog about thermal mass with a chart comparing several types of materials. It might help you think through your selection.
We noticed he had no friends. So we gave him this tiny ad:
Rocket Mass Heater Plans - now free for a while
    Bookmark Topic Watch Topic
  • New Topic