Straw bale walls have an R-value of up to 43 compared to the standard R-19 wall achieved with 6 inches of insulation. In addition, a space wrapped in straw bales has no dense structural members which transmit heat from the interior or cold from the exterior.

JBC uses a post and beam structure made of dimensional lumber and composite lumber with traditional floor and roof framing systems to create the exterior walls of a building. “In filled” within this structure are the straw bales. Windows and doors are patterned between the posts. Different types of window and door bucks are used that can create distinctive opening with unique sills.

JBC has perfected a number of plastering and stucco options. Stucco generally refers to a mix that contains cement, whereas plaster refers to earth, lime, or gypsum. Different combinations have been used depending on the results being sought. The stucco or plaster added to the straw bale wall provides a durable, aesthetic, and efficient wall system.

Care needs to be taken in the design of any building to ensure that the walls resist fire, moisture, and insect and animal damage. Straw bale walls encased in plaster and stuccos have be tested and proven to be virtually fireproof. There is not enough air in the wall to allow combustion. The correct use of stucco and plastering materials, the use of a generous overhang, a distinctive break from the earth, and care taken to seal wall penetrations eliminates any moisture problems. This carefully executed sealing also provides an insect and animal barrier.

In addition to energy efficiency and the use of a renewable building product, buildings constructed of straw bales have an enduring aesthetic. The massive walls recall long-lived building traditions from around the world. The warmth offered in winter and the coolness in summer combined with the thick sound barrier ensures a comfortable secure living space.

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