Almost all kitchen specialists work with a thin layer of wood on sheet material. We have been making wooden kitchens for 16 years and we know what the wood does. One summer and winter the wood will start to work a bit. After that it is usually a stagnant process. All the wood we use has been dried for more than a year. We give a lifetime guarantee on the kitchens (for the person who bought it) because we stand behind it 100 percent.