What are you talking about? I know it's possible to roof a house with slate tiles, but few houses have that. They are scarce enough that the cost would be prohibitive. There are man-made materials that perform as well for a lower cost.
Ok, you are inquiring about details for a roof on your own house. That is going to depend on where the house is and who is available to work there. So you just have to find a roofing contractor in your area and present your questions to him.