Down to Earth: Rammed Earth Achitechture - Sergio Asensio - PeriboAn ancient building method that has experienced a renaissance in recent years as people seek greener and more sustainable building materials and construction methods, rammed earth is a wall building technique that uses earth, chalk, lime and gravel as raw materials. Naturally insulating, non combustible, and durable, they can be labor intensive to construct without machinery and are susceptible to water damage if not properly protected or maintained.