Timber frames have traditionally been built using green timber - meaning timber that has a high moisture content because it has not been sufficiently air dried or kiln dried. There are several reasons for this tradition: As wood dries it become more difficult to work. Green timber is easier to work with chisels, and other hand tools. Stockpiling timbers until they dry would take two to four years. Most people are not willing to wait years for a timber frame. As green wood dries out it shrinks. We allow for this shrinkage in our design and joinery. As the frame dries, the type of joints we use maintains their tightness. All medieval and new world timber frames used the same type of joints we employ.