I'm no expert but we built a rocket mass heater in N France in 2015 and it's a our primary heating method. I’ve no idea to what extent the paper pulp was doing the insulating, but the house is snug. His climate is very wet, with cool but not freezing winters. He specified that he added two layers of plaster: the first is perlite-heavy, the second is a weather protecting layer with sand. Craig Ray's cob house in New Zealand (below) boasts a mix of perlite and paper pulp in the plaster with splendid results. It hasn’t been tested much in earth plaster, and the R value would certainly reduce depending on the ratio of perlite to plaster. Perlite is a volcanic glass with an R value of 2.7 when used pure and compacted. Perlite? I was a bit dubious about perlite, because I wasn’t sure you could compact it enough in the plaster for it to work sufficiently as an insulator.Finally, when it’s a sticky pulp, mix it into your adobe. Let it soak in water overnight, then mash it with some kind of blender/mixer. To make it, shred lots and lots of newspaper finely. 3-4 inches of this is going to help keep you toasty. Paper adobe has a high R value, so it’s worth experimenting with. Paper adobe (R2.5-3 per inch): Paper adobe, as suggested by the name, is where you mix re-pulped paper with clay and earth to create a paper-rich adobe. You can buy cork granules and mix them into your plaster instead of the sand. The cork tree’s bark can be harvested every 9 years. It has a very high insulating value, is also superb for sound-proofing, and, counter-intuitively, it’s relatively fire-resistant as well. Please note: That plaster needs to be pretty straw/sawdust heavy to have a decent effect. Sawdust/straw: If you mix a decent quantity of straw or sawdust into your plaster (instead of the sand), things are soon going get warmer in your mud world.But if you live in a temperate climate, or a place where you need a little extra oomph in the winter months, insulating plaster can work a treat. You’ll want to use the Other Ways to Insulate an Earthern Wall listed in the next section. First, let's be clear Mixing insulating materials into your earth plaster alone isn’t going to cut the mustard in seriously cold climates.
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