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27 Broadley Terrace, London
Broadley Terrace, London NW1, UK
27 Broadley Terrace, London
associated engineer
Anthony Hunt Associates
Anthony Hunt
date  1983 - 1985, 1992
era  Modern  |  category  Building  |  reference  TQ272822
photo  Jane Joyce
Hopkins Architects is housed in a group of interesting High Tech buildings in north London. One is constructed from a series of components designed as part of the Patera system, the other is an original 1970s Patera building relocated from its Barrow-in-Furness site.
The Patera relocatable building was designed by Michael Hopkins and engineered by Anthony Hunt Associates in the late 1970s. The idea was to create an off-the-peg structure from industrialised steel and glass components, adaptable for different uses.
The main building at Broadley Terrace No.1 Building (pictured) has a floor area of 324 sq m and is 18m square in plan. Its internal height is just over 5m, high enough to accommodate a free-standing mezzanine floor insert.
Just like the original Patera buildings, No.1 Building is clad in 3.6m x 1.2m prefinished double-skin insulated pressed steel panels, used for both walls and roof. The panels are connected to 100mm x 50mm RHS purlins by special fasteners, at 1.2m centres.
However, unlike the originals, which used a three pin arch hydrid structure, the building's roof trusses are supported on external cantilevered columns, located at 3.6m centres. CHS line bracing stabilises the trusses. Stainless steel rods with adapted yacht rigging connectors are used for truss cross bracing. Cross bracing for the columns was avoided by careful foundation and cantilever design the building relies on the diaphragm action of the panelling for stability.
Using a different structural system challenged both the engineers and the manufacturers. The original design allowed for a slight pitch in the roof for rainwater runoff. Here, a camber of 90mm has had to be included in the truss design: the trusses appear flat but actually rise at mid span. Imposed loads, such as snow, cause movement, which is allowed for by the provision of movement joints along the top of the front and back glazed elevations.
In 1992, Whitby & Bird oversaw the re-erection of a standard Patera building on the site, Mark Whitby having worked as project engineer on the original Patera project. The building was reconfigured to include glazed panels and side entrance doors and now performs the duties of an annexe to the main building. The ease and speed of construction on a restricted site confirmed the vaildity of the Patera concept.
The emsemble is completed by a tensile fabric roofed walkway, which covers the entrance and building link. Another shades the centre bay roof of No.1 Building. The walkway brings the two similar but different structures together.
Architect: Michael Hopkins & Partners
Specialist contractor: Patera Products Ltd
Engineer (1992 relocation): Whitby & Bird
Research: ND
"High Tech Architecture" by Colin Davies
Thames and Hudson, 1998
"Michael Hopkins" by Cristina Donati
Skira Editore S.p.A., Milan, 2006

27 Broadley Terrace, London