At the castle of Guédelon, each step reproduces the gestures and tools of the Middle Ages. The squaring of the wooden beams is done in the direction of the fibers, always using an ax and a doloire (mutton shoulder). After prospecting in the surrounding forests, the chosen trunk is stripped of the bark and sapwood, leaving only the hard part or heartwood. Oak will be used for lumber (frames, floors), while beech will serve for furniture. Finally, birch wood will provide food utensils and rafters.