Light-Weight Concrete:
A concrete building system that utilizes a light-weight aggregate or has a substantial amount of air in the mixture. Some light-weight aggregates are pumice (volcanic rock) or fly ash. Some fly ash is reclaimed from industrial waste.

Lightweight concrete typically has a medium compressive strength, and fairly good thermal mass and insulation qualities. This medium weight material is easy to work with and has proven to be a very efficient building system.

These materials can be environmentally sound, plentiful, energy-efficient, safe, reliable, and as easy to use as traditional materials (such as wood or standard concrete).