In what type of construction is straw utilized as a primary building material?

Straw bale construction is a building method that utilizes straw bales primarily as structural elements in walls. This technique involves stacking bales of straw to create a highly insulative and sustainable wall system, making it an environmentally friendly option. The straw bales provide natural insulation due to the air pockets within the straw, which helps to regulate temperature and minimize energy costs.

In contrast, the other types of construction mentioned do not utilize straw as a primary building material. Timber framing relies on wooden beams and posts, while concrete masonry uses concrete blocks or bricks. Log cabin building is characterized by the use of whole logs to construct walls. Therefore, straw bale construction stands out distinctly as the method that incorporates straw as a central component in its design and functionality.