David W. Allan’s Solar Home

David Allan's solar home in Utah, which has no furnace, has stayed adequately warm all winter for two decades.
David Allan’s solar home in Utah, which has no furnace, has stayed adequately warm all winter for two decades.

“Located in the cooler central Utah climate at 6,000 foot elevation, the Allan’s solar home integrates at least ten different forms of solar, including: trombe wall, solarium convection, photovoltaic cells, propylene-glycol heat exchange, eutectic salt chamber, berm insulation, black chimneys and under-ground intake for passive solar air conditioning, and dehydration of food.”

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Flat Hyperadobe Walls

Partially flattened polypropylene earthbag wall (left) versus hyperadobe earthbag wall made with mesh bags or tubes (right)
Partially flattened polypropylene earthbag wall (left) versus hyperadobe earthbag wall made with mesh bags or tubes (right)

We discussed flattening earthbag walls in a previous blog post: Flattening Walls to Save Plaster

In that blog post (and the following Comments afterwards) I described some of the basics of this technique: tamp the sides of walls after several courses are complete; don’t wait too long or the soil will dry and be difficult to tamp; use enough clay in the mix so the earthbags are malleable; focus on eliminating awkward bulges; don’t tamp the walls completely flat – leave recesses between courses of bags so the plaster has something to grab onto.

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