Figure 4: Foundation Stem Wall — Stone wool or mineral wool with the right density (greater than 10 lbs / ft3) can be installed under concrete slabs. (buildingscience.com)
Figure 7: Cold Climate Stem Wall — The key to this detail is the interior perimeter drain and a granular capillary break along the vertical portion — as well as the horizontal portion — of the stone wool and mineral wool layer. (buildingscience.com)
Their smallest design is the Garden / Backyard Dome which is approximately 12 feet in diameter, provides 100 square feet of floor space and can be built on a small stem wall to provide additional height. (pearltrees.com)