Did you know? Bangkok has approximately 4–5 main soil layers. This has a significant impact on the construction of buildings, foundations, and piles. The soil layers in Bangkok are as follows: Soft clay With an average thickness of 10–15 meters, the soil is soft, making buildings prone to subsidence and a major cause of house sinking problems. Medium stiff clay Located approximately 15–20 meters deep, it is stronger than before, but still unsuitable for high-rise buildings. S