Engineers and builders or contractors will have a better idea of what type of subsoil is present. And they will act accordingly in building an appropriate foundation for the structure. You see, catastrophes could have been prevented, had older buildings been soil tested prior to building.
Soil testing also allows contractors to see if the soil type will pose a danger to the foundations. It’s especially needed during drought years. As the subsoil dries out, the structure of the subsoil expands and contracts. These movements can occur in the house’s foundations.
One likelihood why a house’s foundation gets damaged over time is because of the high amounts of iron sulfides. Iron sulfides can alter and damage both concrete and metal over time.
So, why soil testing, you ask? In other words, it provides necessary information on what you’re really building on. It will also dictate what the foundations need in the way of engineering.