In April, 2,000, an owner-built house using Cast Earth walls by Affiliate Rare Earth of Flagstaff, AZ, was started. The structure is about 2,000 square feet. Rare Earth is no longer an active builder.

Another home with 24 inch walls containing 4 inches of internal foam thermal break. Many of the features now typical with Cast Earth are included, such as radius corners on all openings and an exposed bond beam which lintels them.