Yingzao Fashi
In most cases, the weight bearing outer wall of tulou consists of two sections, the lower section is built from cut stone blocks or river cobbles held together with a lime, sand and clay mixture to a height of about one or two meters, depending upon the regional flood water level. The compacted earth wall stacked on top of the stone section. The construction of earth wall from compacted earth mixed with sticky rice and reinforced with horizontal bamboo sticks was described first in Song dynasty building standard "Yingzao Fashi."