• 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 private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • Nicole Alderman
  • r ranson
  • Pearl Sutton
  • Mike Haasl
  • paul wheaton
stewards:
  • Joylynn Hardesty
  • Dave Burton
  • Joseph Lofthouse
master gardeners:
  • jordan barton
  • Greg Martin
gardeners:
  • Carla Burke
  • Ash Jackson
  • Kate Downham

earthbag corbel question re: overhanging layers sagging/drooping

 
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi, all,

Newbie to Permies.com here, so please excuse me if I did anything incorrect with this post.  I searched around first, but could not find anything already written that addressed this question.

I'm building a 14 foot diameter earthbag corbel dome in the southern New Mexico desert.  Only the first few rows/layers have been put down so far.  On the most recent row/layer, I temporarily moved one of the bags inward (toward the center of the circle) by about 2 inches to see how the bags will react when I begin corbelling.  As I suspected, the overhanging part of the bag was drooping/sagging.

So, my question is this:
Is sagging/drooping a normal and acceptable part of the corbel dome, or is there something else that I should be doing to prevent sagging/drooping?


MARKBRUNNR:
I'm replying here bc there is no 'post reply' button showing for some reason. Thanks for your response. Actually, the there is no sagging in the dampened and tamped bags themselves. The sagging is only happening on the overhanging 2 inches (where there is nothing but air underneath the overhang) when I attempt to shrink the circle to create the corbel.  That is the part I am curious about.
 
gardener
Posts: 698
Location: SoCal USA
140
cat dog trees wofati composting toilet bike solar
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
From what I have read/seen you might not have enough material in the bag, and if the material is moistened then after tamping the layer down they should each be pressing equally towards the middle and hold each other up, and they will dry into a really hard material that shouldn't sag at all.
 
gardener
Posts: 3124
Location: Upstate NY, zone 5
155
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I haven't done earthbag building as such, but simply from my experience with materials, I expect the sagging you see is normal. I think you will need to tamp the corbel bags horizontally as well as vertically if you want the inner face solidified. It doesn't matter if the bags sag a bit on the inner face as long as they stabilize in position.


The "Post Reply" button should be on the bottom left under the latest post, if you have a standard computer window view. If you have a phone or tablet, it may be different and I can't say where elements will be.
gift
 
Unofficial Companion Guide to the Rocket Oven DVD
will be released to subscribers in: soon!
reply
    Bookmark Topic Watch Topic
  • New Topic