 Due to the building being above the original ground level, fewer moisture problems are associated with earth berming in comparison to underground/fully-recessed construction, and costs less to construct.According to one report, earth berming provided 90-95% of the energy advantage as a completely below grade structure.The in-hill (also termed "earth covered", or "elevational") construction is where the earth shelter is set into a slope or hillside, and earth covers the roof in addition to the walls.