gift
Rocket Mass Heater Manual
will be released to subscribers in: soon!
  • 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
  • Leigh Tate
  • Pearl Sutton
  • r ranson
stewards:
  • Nicole Alderman
  • paul wheaton
  • Mike Haasl
master gardeners:
  • Carla Burke
  • John F Dean
  • Jay Angler
  • Beau Davidson
gardeners:
  • Jordan Holland
  • thomas rubino
  • Nancy Reading

Crushed Lava Rocks vs Perlite or Vermiculite

 
gardener
Posts: 361
Location: Central New York State zone 5a
13
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Can I just use crushed lava rocks mixed with clay and sand for the inside of the heat riser instead of perlite or vermiculite? I mean, perlite and vermiculite are both volcanic rocks, right?
 
gardener
Posts: 791
Location: Tonasket washington
49
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
yep that they are however each has a specific insulation value. pumice being the lowest and perlite being the highest. in order to get the insulation values you have to use more materials. so you end up spending just as much to get 4 times the pumice as you would for a two 2 cubic foot of perlite.
 
Posts: 2
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
So are you saying to replace the "clay-stabilized perlite"  as the base of the heat riser per your book,  I have to use an 8 inch layer or pumice stone instead of a 2 inch one?

I have alot of light weight white round pumice stone to be used in a soil mixture (not dense crushed black or red landscape lava rock as the previous questioner).  It seems very similar to perlite  still probably more dense as you say.

Thanks if you can confirm, and thanks for your book,
Drew
 
Never trust an airline that limits their passengers to one carry on iguana. Put this tiny ad in your shoe:
An EPA Certified and Building Code/UL Compliant Rocket Stove!!!!!
EPA Certified and UL Compliant Rocket Heater
reply
    Bookmark Topic Watch Topic
  • New Topic