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As equipment for moving the casks do not fit inside dunnage warehouses the barrels always have to be moved individually, and by hand. These costs are further exacerbated by far higher maintenance costs.
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Unfortunately the relative costs are far higher than in a racked or palletised warehouse, in part due to the far more limited storage capacity which offers a poor ratio of space to stored goods. Thanks to their thick walls and roofs Dunnage warehouses experience less outside influence than other types warehouses. The main advantage of Dunnage warehouses are excellent air circulation and microclimate with a higher level of humidity. Major players such as Diageo use the majority of their distillery based dunnage warehouses only partially if at all. However even with this understanding only around 4.5% of all barrels could be stored using Dunnage warehouses in Scotland, and the number is almost certainly less. Dunnage warehouses often have only one floor but there are also those with two, three and more storeys in use.
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The oak casks stored for whisky maturation within a Dunnage warehouse are stacked directly on top of each other, stacked to a maximum of three layers high. What is a Dunnage warehouse?Ī Dunnage (warehouse) is a traditional type of warehouse for maturing spirits, which is made of stone or brick these have no solid floor, are built rather low and have thick walls. There are three different categories of warehouses the traditional dunnage warehouses, racked warehouses and the more modern the palletised warehouse. In Scotland, and most of the rest of the world, the minimum period for whiskey to mature is three years in appropriate warehouses. The warehouse is a building, mostly attached to a distillery, in which the spirits slowly mature in oak barrels for years.