clau rojas

clau rojas

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There are several ways to construct an earthen floor. I use a 2-layer system. The base layer is about 4" thick, and is a mixture of clay, sand, and straw...strong  controlled for cracking. That layer sits on top of a moisture barrier plus 6" to 12" of gravel base. I also put insulation underneath, otherwise your floor is always trying to come to the same temperature as the ground...57F around here (and that makes warming inside in winter a challenge)

A dirt floor that's durable, comfortable and as permanent as many other flooring materials. Perfect for your cob or straw bale house!

Use brick under earthen floor for thermal mass?

Mike and Greg used chunks of urbanite and old bricks, and then gravel on top of that. After some tamping the base is ready for the sub floor mix! The mix they used for the sub floor was 4 parts sand to 1 parts clay slip, made from the local clay subsoil.