Rammed earth

Rammed earth, also known as taipa (Portuguese), tapial (Spanish), pisé (de terre) (French), and hangtu (Chinese:夯土; pinyin:hāngtǔ), is a technique for building walls, foundations, and floors using natural raw materials such as earth, chalk, lime or gravel. It is an ancient building method that has seen a revival in recent years as people seek more sustainable building materials and natural building methods.