From the Solar Decathlon Website:

This house uses durable, insulated, robust precast concrete panels that are factory-produced and assembled on-site. Specially designed dry connection methods using bolts rather than traditional field welds, make field assembly much easier than traditional methods, significantly reducing labor and material waste.

The team’s design consists of a single precast concrete structure intended as a demonstration of integrated advanced building technology, and a compelling alternative to traditional wood, light-frame construction. High performance precast concrete are inherently resilient, protecting against fire, moisture and mold, insects, seismic events and extreme weather conditions such as storms, strong winds and man-made phenomena such as blasts, force protection and acoustic mitigation.