Wood is sometimes used in a masonry type of construction, known as cordwood construction, stackwood construction, or stackwall construction. Cordwood consists of logs that have been cut into lengths which are suitable for burning in a fireplace or woodstove, around 16 inches to around 24 inches in length (~40 cm to 60 cm). This wood can be split or left in the round. The length of the logs is the thickness of a wall to be built. Nice thick walls: very strong and good insulators.