Scroll down this page to see a construction site video of the Karuna House in Yamhill County, Oregon, showing the installation of capillaryForces that lift water or pull it through porous materials, such as concrete. The tendency of a material to wick water due to the surface tension of the water molecules. break material on top of the footings to prevent moisture from wicking up the foundation walls.
The Karuna House was designed by Holst Architecture and is being built by Hammer & Hand of Portland, Oregon.
Here's a link to the first video in the series: Installing Rigid Foam Under Footings.