It was important to the Roman army to have enough grain to feed its soldiers. The grain was stored in large granaries inside the fort. Granaries were large buildings with raised floors to keep the grain dry and out of reach of pests such as rats. A wooden granary was later replaced by a stone building.
The timber granary
The granary was built on a solid base of compacted gravel and the timber foundations were put in narrow trenches. The structure had to be strong to hold the weight of the grain. Later the timber granary was dismantled and a new stone granary was built in the same place.
The stone granary
The stone granary was slightly bigger and had stone walls on stone foundations. Like the timber granary, the raised timber floor was supported by upright wooden posts inserted into wooden beams. Stone buttresses outside the walls added extra strength to the building.