Hello. I'm looking at doing this also on 12 acres I purchased in southern Colorado. The building will be a glass studio and I plan to adapt it to a 12 x 20ish rock slab on the property, although I may go further out on the front (south facing slope) which drops off the slab but would give me more area for a earthship style integrated greenhouse. Can anyone point me to a better explanation on waterproofing the first layer? Also looking for best price on bags, I'm ready to order. Thanks!
