Rug warehouses in the Speicherstadt

The warehouses of the Speicherstadt are built of red brick on oak piles. That is not just Hamburg tradition, it is building physics. Brick absorbs moisture slowly and releases it slowly. Oak under water does not rot, it hardens. Together they yield a storage space with a remarkably constant climate, without ever needing climate control.

For wool rugs, this is ideal. Wool absorbs up to 30 percent of its own weight in moisture without feeling wet. In a room that is too dry it becomes brittle, in one that is too damp it develops mildew. The warehouses settle at around 50 to 60 percent relative humidity and stay between 10 and 18 degrees Celsius, depending on the season. That is precisely the window in which oriental wool rugs remain stable.

For silk rugs, the climate matters even more. Silk reacts to dry air with brittleness, and to overly damp air with a loss of sheen. The warehouses are passive protection here, with no electricity bill.

The black cast-iron swinging arms protruding from the warehouse facades are not decoration. They are hoists. They were installed between 1885 and 1910, initially hand-operated with drum and rope, later with electric motors. A single hoist lifts 500 to 1,000 kilograms, depending on the model and the floor.

For rugs, this was the only practical method. A roll of a heavy Bidjar or Heriz weighs between 30 and 80 kilograms. Three men can carry it up the stairs to the second floor, five to the fourth. With a hoist, one man works the lever, a second guides the roll into the window of the destination floor. Two minutes per roll, no extra weekend even at wholesale volumes.

Most of the hoists are now decommissioned, some are preserved as monuments. In a few buildings they still work and are used for exactly this purpose.

The Speicherstadt is not a street layout, it is a water layout. Between every block flows a Fleet, a narrow tidal canal. Until the 1960s, Schuten travelled along these Fleete, small flat barges without their own propulsion.

Goods were loaded from the main harbour basin into a Schute, towed through the Fleet to the gate of the relevant warehouse, and lifted up via the hoist. The barge needed no truck, the truck needed no harbour crane. The logistics were remarkably compact for Hamburg standards.

For rugs, this meant in practice: a delivery of Smyrna goods could be unloaded at the main quay at 9 in the morning and lie in the third floor of the warehouse by 11, without the bundle ever seeing the street. Today no Schuten travel the Fleete any more, but the architecture is a reminder of how efficient that logistics chain was.