The south side of the church features three large curved walls of pre-cast concrete. (The walls form segments of spheres.) Meier claims to have designed the church to minimize thermal peak loads inside. The large thermal mass of the concrete walls control internal heat gain; the result is less temperature variation, and supposedly more efficient use of energy. The walls also contain titanium dioxide to keep the appearance of the church white. Enrico Borgarello, the director of research and development for Italcementi, the company that designed the cement, claims that the cement destroys air pollution.
According to Borgarello