There are different methods of drying wood, and the most common is conventional air-drying. One of the methods that have been investigated in recent years is drying wood by microwave heating [1]. If wood is exposed to an electromagnetic field with such high frequency as is characteristic for microwaves, the water molecules, which are dipoles, begin to turn at the same frequency as the electromagnetic field. However, wood consists not only of water but also of polymers as cellulose, hemicellulose and lignin. These polymers are also polar molecules, and therefore even they are likely to be affected by the electromagnetic field. According to Oloyede and Groombridge [2] the strength reduction in wood was 60% when microwave energy was used for drying as opposed to air-circulation drying. However, that result may be dependent