Montana General is a leader in Cellular Concrete, offering modular units that can be fully completed or flat-packed panels for on-site assembly. Our units are constructed from Light Gauge Steel and Cellular Concrete, forming a Structural Insulated Panel System (SIP). Cellular Concrete is lightweight, fire-resistant, mold-resistant, rodent-resistant, and bug-resistant, making it ideal for all climates, including areas with high humidity and fire danger.