Difficulties are impregnating long wooden elements, e.g.. rafters by immersion. And this is the most effective way. For this impregnation, you can make a shallow groove in the ground and cover it with thick garden or construction foil. In such a groove filled with impregnation liquid, it will be easy to get long items wet, take out after soaking and set aside to dry. After impregnation, the liquid must be poured out in a small vessel, remembering, in order not to pollute the environment. We also properly dispose of the foil itself.
