Also known as adobe floor, this floor also provides heat to the space via hot water tubes imbedded in the floor, a wonderful system in a space intended primarily for young children. We selected Wirsbo brand tubing, for it's good reputation and easy-to-use fittings. Normally, laying the tubing is a chore requiring a special reel rig, because the tubing is stiff and can be uncooperative. We side stepped the problem (pun intended) by sheer numbers: some people stood on the tubing while others fastened it down with pole-barn nails and nylon ties. Many feet make light work.