At a third of the weight of traditional concrete, wall and floor systems made of autoclaved aerated concrete (AAC) are easy to install: an eight-man crew can install 3200 sq. ft. of wall panels or 6400 sq. ft. of flooring in just one day. This durable, fire-resistant concrete has a high strength-to-weight ratio, and is considered a sustainable building material by Energy Star and the U.S. Green Building Council. Hebel. +1300-369-448.