One of the most enjoyable natural materials to work with is earth plaster (which is also referred to as mud plaster and clay plaster). It is also known as mud plaster and clay plaster. The material is as simple as the name implies. Earth plaster is nothing more than sand and clay (with chopped straw, if desired) mixed together in the proper proportions to prevent cracking. When mixed and applied properly, this wall covering will be hard, durable, and beautiful. In many regions of the country, earth plaster can even be used on the exterior walls and may easily last for seven to ten years or more without any maintenance.
Mud is magic. Mud is fun. Mud can also be quarrelsome.
Don't get me wrong, I love earth plasters. I want all new strawbale homes to be wearing them. They make the most beautiful walls I have ever seen. The colors are gorgeous and incredibly varied. The walls feel soft and homey. Earth plasters can be rustic and undulate with the bales, or create smooth walls with even curves and a polished finish. The materials are cheap, easy to come by, and healthy for the environment.
Earth-plastered walls breathe like living beings, protecting bales from moisture damage by exhaling moisture instead of locking it inside. Mud is a blast to work with, can be extremely durable, and is easy to patch and repair when necessary. (Durability sidebar.) I highly recommend it.