I'm sorry, but your question is ambiguous. I would have to know where you are talking about, beneath the house or on top. I will answer that we did not build the house. It was six years old when we bought it, and the owner did not provide us with a soil report. As I stated in the article, the house was built on a hill that was measured at a 45-degree angle. Then a mound was built up to make a level building surface on which to build the house. I included a photo of the house taken from down the hill that shows the steepness of the slope and the back of the house with attached greenhouse. You might look at it for the slope. I don't know what the builder used. In our area builders use donafil, but I have no proof that it was used here.