Unlike a conventional pallet warehouse, a high-bay warehouse has racks at least twelve meters high. These can be built up to 50 meters. In the case of particularly high high-bay warehouse, the racks themselves are the load-bearing framework of the building, also known as a silo type of construction. Thanks to the height and construction structure, more pallets can be stored in a smaller space. Storage and retrieval machines are used in such warehouses because they allow automated operation between the individual rows of racks.