a place for storing grain could be in a granary but I am not sure so if it could be a granary.
A grain silo.
It is called a granary
A barn A grain silo a grain store
a place to store grain
A granary; a building or place where grain is stored for preservation., To gather for preservation; to store, as in a granary; to treasure.
Granary (n)which means a storehouse for threshed grain or animal feed
Storage means to place items in a building or room to store. It can also mean to memory on an electronic device.
A grain store is defined as a store where most agricultural products are stored especially grains. A grain store will have food reserves in great quantity.
A silo for corn silage, a crib for ear corn, or a bin for shelled grain corn.
A grain elevator is a tall building that often stands around 400 feet tall that is used to store grain prior to shipping out on a train or by truck. Using a series of augers and chutes, grain, which is dumped through a grate in the floor by the truck that goes through an drive-through opening in the building, is moved into a storage unit. When a truck or train comes to pick up the grain and ship it somewhere else, a spout from above is used to pour the grain into the box of the truck or the car of the train. Then the grain is shipped away.
A grain elevator is a tall building that often stands around 400 feet tall that is used to store grain prior to shipping out on a train or by truck. Using a series of augers and chutes, grain, which is dumped through a grate in the floor by the truck that goes through an drive-through opening in the building, is moved into a storage unit. When a truck or train comes to pick up the grain and ship it somewhere else, a spout from above is used to pour the grain into the box of the truck or the car of the train. Then the grain is shipped away.
If you mean attic (top of the house) it is grenier in French (literaly the place where you store grain)
There are a number of great places to find stock building supplies. The best place to start is a local hardware store such as Home Depot or a Lowe's Home Improvement store.
During the dry season there would be little to eat if people did not store grain.