Win a copy of Compost Teas for the Organic Grower this week in the Composting 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 private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • paul wheaton
  • Joseph Lofthouse
  • Mike Jay
  • Jocelyn Campbell
  • Devaka Cooray
garden masters:
  • Steve Thorn
  • Dave Burton
  • Dan Boone
  • Joylynn Hardesty
  • Mandy Launchbury-Rainey
  • Mike Barkley

The right kind of plaster for finishing a cob thermal mass

Posts: 54
Location: Vermont, USA
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hello all,

I'm getting somewhat close to the finish work on my thermal mass (posted a couple pictures of current state and I'm trying to figure out how to finish (as in "make durable and nice looking") it.  So far plaster seems like the main contender (helpers around with lots of plaster experience).  What I'm not sure about is what kind of plaster is right for the job.  I've seen some posts in the forums discussing gypsum (not ideal for high temperatures, but the mass shouldn't be high temperature...) and some references to lime plaster.  We've also been discussing hydraulic lime plaster as an option.  I think the gypsum plaster around here has perlite in it, too.

So, considering the mass specifically is there a reason to prefer one kind of plaster over another?  Again, this will likely be the final layer (except for any cushions or pillows or whatnot we end up with) so I want something that's going to stand up to some abuse.

I knew I would regret that burrito. But this tiny ad has never caused regrets:
Intrinsic: An Agriculture of Altered Chaos
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!