Nissen hut



A Nissen hut is a prefabricated steel structure, made from a half-cylindrical skin of corrugated steel. Originally designed during World War I, it eventually evolved into the Quonset hut, which was used extensively during World War II.

Description
A Nissen hut is made from a sheet of metal bent into half a cylinder and planted in the ground with its axis horizontal. The cross-section is not precisely semi-circular, as the bottom of the hut curves in slightly. The exterior is formed from curved corrugated steel sheets 10 feet 6 inches by 2 feet 2 inches (3.2 × 0.7 m), laid with a two-corrugation lap at the side and a 6 inch (15 cm) overlap at the ends. Three sheets cover the arc of the hut (about 54 sheets in all are required). These are attached to five 3 × 2 inch (7.5 x 5 cm) wooden purlins and 3 × 2 inch wooden spiking plates at the ends of the floor joists.

The purlins are attached to eight T-shaped ribs (1¾ × 1¾ × ⅛ inch; 4.5 × 4.5 × 0.5 cm) set at 6 feet 0.5 inch (1.8 m) centres. Each rib consists of three sections bolted together using splice plates, and each end is bolted to the floor at the bearers. With each rib are two straining wires, one on each side, and a straining ratchet (or in some cases a simple fencing wire strainer). The wires are strained during construction. The straining wires do not appear in the original Nissen patent.

The purlins are attached to the ribs using a "hook" bolt, which hooks through a pre-drilled hole in the rib and is secured into the purlin. The hook bolt is a unique feature of the Nissen design.

Interior lining could be horizontal corrugated iron or material like Masonite attached to the ribs. Sometimes corrugated asbestos cement sheeting is used. The roof and lining form a circular space with a radius of 8 feet 0.5 inch (2.4 m), although, because of the inward curve, the floor is only 15 feet 10 inches (4.8 m). The space between the interior and exterior lining may be used for insulation and services, if required.

The walls and floors rest on foundations consisting of 4 × 4 inch (10 × 10 cm) stumps with 15 × 9 inch (38 × 23 cm) sole plates. On these are 4 × 3 inch (10 × 8 cm) bearers and 4 × 2 inch (10 × 5 cm) joists at 2 feet 10 inch (1 m) centres. The floor is made from tongue and groove floorboards. At East Hills and at Villawood the floor is concrete; the ribs in this case were simply attached to the concrete slab by a metal strap.

At either end the walls are made from a wooden frame with weatherboards nailed to the outside.

Windows and doors may be added to the sides by creating a dormer form by adding a frame to take the upper piece of corrugated iron and replacing the lower piece with a suitable frame for a door or window.

Nissen huts come in three internal spans — 16 ft (4.9 m), 24 ft (7.3 m) or 30 ft (9.2 m). The longitudinal bays come in multiples of 6 ft (1.83 m). The corrugated steel half-circles used to build Nissen huts can be stored efficiently, because the curved sheets can be cupped one inside another.

However, there is no standard model of Nissen huts, as the design was never static but changed according to demand.

History
Between April 16 and April 18, 1916, Major Peter Norman Nissen of the 29th Company Royal Engineers of the British Army began to experiment with hut designs. Nissen, a mining engineer and inventor, constructed three prototype semi-cylindrical huts. The semi-cylindrical shape was derived from the drill-shed roof at Queen's University, Kingston, Ontario (collapsed 1896). Nissen’s design was subject to intensive review by his fellow officers, Lieutenant Colonels Shelly, Sewell and McDonald, and General Clive Gerard Liddell, which helped Nissen develop the design. After the third prototype was completed, the design was formalized and the Nissen hut was put into production in August 1916. At least 100,000 were produced in World War I.

Nissen patented his invention in the UK in 1916 and patents were taken out later in the United States, Canada, South Africa and Australia. Nissen received royalties from the British government, not for huts made during the war, but only for their sale after the conflict. Nissen got some £13,000 and the DSO (Distinguished Service Order).

Two factors influenced the design of the hut. First, the building had to be economical in its use of materials, especially considering wartime shortages of building material. Second, the building had to be portable. This was particularly important in view of the wartime shortages of shipping space. This led to a simple form that was prefabricated for ease of erection and removal. The Nissen hut could be packed in a standard Army wagon and erected by six men in four hours. The world record for erection was 1 hour 27 minutes.



Production of Nissen huts waned between the wars, but was revived in 1939. Nissen Buildings Ltd. waived their patent rights for wartime production during World War II (1939-45). Similar-shaped hut types were developed as well, notably the Romney hut in the UK and the Quonset hut in the United States. All types were mass-produced in the thousands. The Nissen hut was used for a wide range of functions; apart from accommodation, they were used as churches and bomb stores, etc. Accounts of life in the hut generally were not positive. Huts in the United Kingdom were frequently seen as cold and draughty, while those in the Middle East, Asia and the Pacific were seen as stuffy and humid.

Although the prefabricated hut was conceived to meet wartime demand for accommodation, similar situations, such as construction camps, are places where prefabricated buildings are useful. The Nissen hut was adapted into a prefabricated two-storey house and marketed by Nissen-Petren Ltd. The standard Nissen Hut was often recycled into housing. A similar approach was taken with the U.S. Quonset hut at the end of World War II, with articles on how to adapt the buildings for domestic use appearing in Home Beautiful and Popular Mechanics.

However, the adaptation of the semi-cylindrical hut to non-institutional uses was not popular. Neither the Nissen, nor the Quonset developed into popular housing, despite their low cost. One reason was the association with huts: A hut was not a house, with all the status a house implies. The second point was that rectangular furniture does not fit into a curved wall house very well, and, thus, the actual usable space in a hut might be much less than supposed.

In the UK, after the Second World War many were converted to agricultural or other functions, and numerous examples have since been demolished.

In Australia, after the Second World War, the Nissen hut was  built  at many  migrant camps around the country.

Use as ordinary housing
Most post World War II Nissen huts were used by governments.

However there is one block that was built as private housing. 50 Nissen huts were constructed in North Belmont, a suburb of Newcastle in New South Wales, Australia after World War II. They were designed to provide cheap, ready-made housing for post-war British migrants families. While 17 of the huts were eventually demolished, the remainder have been refurbished, improved and extended over time, and remain popular with their owners. Currently, there are attempts to have the remaining cluster of huts declared as a conservation area, with the objective of assisting in their preservation.

Also, in two towns an hour's drive from Belmont, at Cessnock and Kurri Kurri in the Lower Hunter area of NSW, there are some more Nissen hut homes still privately owned and in use as houses.

The NSW Hunter Valley area's climate is probably the most suitable for the use of Nissan Huts as homes - Never below freezing in winter, and yet summer is not too humid.