Light Clay Cram

Light-clay Cram 500

I want this southern wall to be mostly cob and earthbags to collect the warmth of the sun. Of course, it would be wonderful to have a pure cob wall, but time does not permit. And after all that’s slow! Here’s the thing though – It’s already cold. I’m pushing my luck with light clay infill. The light clay takes a long time to dry. Even in warm weather you should let the light clay infill dry for a couple of months before plastering. Cob too. It won’t dry in time. Basically, I’m after a wind break for the winter so I can work inside.
Light-clay Cram Light-clay Cram  Light-clay Cram and mud

Light Clay Cram

It’s somewhere in between wattle and daub and light clay infill, but it not really either. I’m making use of my post and beam structure by nailing saw mill ‘waste’, known as mill ends, to the posts. This creates a good lattice for what comes next.

I made some light clay and let it sit out in the sun for an afternoon. The earth absorbed the excess moisture and the clay gets pretty tacky. I took a lump of light clay and placed the in between the open space between the mill ends and cram it over to the side. Packing and pushing. The lump of light clay fills the gap and hangs over the mill ends both inside and outside. I just kept doing that until the openings were full. Let dry in the feirce winds…

After a few days of sun and wind it was time to add mud. I tucked earthen plaster in the gaps and covered the light clay. The straw creates a good key. Now when I go back in the spring to add the infill plaster the wall is ready and I have a wind break for the winter.

This has got to be one of the quickest and low cost ways to create a wall. Rather than building up slowly this allows for the wall to go up first and then thicken up later. The wall is up. The materials were cheap. And the amount of human energy was moderate.

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