Keith Dietrich explaining earth plaster to participants

In October 2012, Keith Dietrich and David Cameron led workshops on building with straw bales and earth plaster.

As well as retrofitting one wall with super-insulating straw bales, they did the same with old books and covered them with earth plaster in the same manner.

Here are some photos of the straw bale wall and the book wall from Keith Dietrich, who is currently working in Costa Rica.