Dr. Owen Geiger and I have recently discovered that a book distributed in 1990 in Germany, Building with Pumice, composed by Klaus Grasser and Gernot Minke, portrays investigations done in the 1970â€™s at the Research Laboratory for Experimental Building at Kassel Polytechnic College in Germany that have impressive bearing on the historical backdrop of earthbag building.
A large portion of the book is about the physical properties of pumice, how to acquire and process it, and how to make squares or dividers with pumice/bond, yet the fifth and last part, titled â€œBuilding with Unbonded Pumice,â€ portrays how they started to research the subject of how normal structure materials like sand and rock could be utilized for building houses without the need of utilizing fasteners. The utilization of texture pressed mass material was seen as a cost-effective methodology. They utilized pumice to gather in the sacks, since it weighs less and has preferred warm protecting properties over normal sand and rock. Their first effective examinations were with corbeled arch shapes