i want to insulate the ground of my dome, because I want to use it as a thermal mass. I plan to install a rocket mass heater. The exhaust will warm the ground. i have seen a few examples on youtube, but I haven''t seen an example of insulating the ground below the thermal mass. I would like to know the issues involved. I would have to leave some space for water to drain. and which insulation material does not absorb water and does not compress with, lets say... 50 of earth and an aquaponic system on top? insulating the bottom and the sides also gives me a foundation problem. I don''t want to build a whole wall of concrete blocks below ground. My dome is going to be a 6m diameter dome. Any Ideas?
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I'm getting the materials together for a very small and basic dome usual metal conduit, and a rammed earth tire foundation / raised beds for planting inside, to create some thermal mass, with a big hole in the ground as a water catchment system for more thermal mass. I have only began to read and look at others projects with this but I'm just going to start basic, pretty much £0 involved. And then use it as an experimentation dome and maybe my bedroom.
Any thoughts on making this the most effective on my first try would be greatly appreciated, although I welcome any mistakes as they will be more useful to me and others than getting it "perfect" first time.
Hi Jef and Ben, There are two different systems you could use, either the rocket mass heater, you'll need as much mass as possible to act as a heat store or a ground source system. The ground source system is basically a deep hole under the greenhouse floor cold air is circulated down and rises after it has been warmed by the geothermal heat underground. I'll do a couple of diagrams when I have time.