packedearth

Packed earth, also known as rammed earth or pisé, is a construction technique that involves compacting a damp mixture of soil, clay, and aggregate, often within formwork. This process creates solid, monolithic walls with excellent thermal mass properties. The soil used is typically sourced locally, making it a sustainable and environmentally friendly building material. The mixture usually consists of subsoil, sand, and a small percentage of clay, with an optimal moisture content for effective compaction.

The construction process involves placing the damp soil mixture in layers within temporary formwork, which is then systematically compacted using manual or mechanical tampers. This high compaction density results in strong, durable walls that can bear significant loads. The resulting material is often referred to as "earth-crete" or simply "rammed earth."

Packed earth construction has a long history, with evidence of its use in ancient civilizations across various continents. Modern rammed earth construction utilizes similar principles but often incorporates additives like cement or lime to enhance strength, durability, and water resistance. This technique offers several benefits, including excellent thermal performance due to the high thermal mass of the walls, which helps regulate indoor temperatures by absorbing heat during the day and releasing it at night. It also provides good sound insulation and fire resistance. The aesthetic appeal of rammed earth walls, with their natural earth tones and layered appearance, is also a significant advantage.