If dry wood is used for construction, there are no risks. An authorized Crossin contractor inspects the wood before spraying and will not undertake the work if the moisture content is too high. Foam, due to its high adhesion, adheres to the surface of the wood and provides a barrier against environmental influences. It is with foam, due to its properties, that in houses, for example, wooden roof windows are protected. Any access of moisture is possible from the outside, and the foam, due to its breathability, allows it to evaporate.