Final answer:
The typical outside finish of a straw bale wall is a three-layer coating system that includes a mud-straw mix, a thicker clay or lime plaster, followed by a fine lime plaster or lime wash for a smooth aesthetic finish.
Step-by-step explanation:
The typical outside finish to a straw bale wall is a three-layer coating system. The first layer often consists of a mixture of mud and straw, which helps to bind the straw bales and provide a rough surface for the subsequent layers to adhere to.
The second layer includes a thicker application of clay or lime plaster, which acts as a primary barrier against weather and improves the structural stability of the wall.
Lastly, the final layer is a fine lime plaster or lime wash, which gives a smooth and aesthetic finish. This process creates a natural, sustainable, and highly insulating outer wall that works well with the pier-and-beam construction method.
The end result often reflects the natural colors and materials used, with a finish that may be left natural or painted for additional protection and design flexibility.