Monday, May 5, 2014

Prefabrication experiments - 14 - Pleated plastic roof dome for low-cost housing – designed by B. S. Benjamin

Twentieth century advances in industrialized building induced a new material palette for architectural forms. Concrete, steel and glass were the flagship materials of the industrial era. Plastics were also pioneered but often relegated to a secondary role in building construction: finishes or furniture. Plastics or more precisely polymers introduced new possibilities of lightness, colour, durability and thin skin fabrication techniques based on mouldings, injections, extrusions, or rotational moulding. Plastics were intimately related to mass-repetition in order to spread the cost of moulds and injectors over the quantity of produced objects.

The use of plastics for modules, units, components, elements, pieces, and sections all contributed to the transformation of building from a massive artefact to an assembled system of mass-produced parts. The vocabulary of industrialized architecture is articulated upon this unit to whole relationship. The parts produced on a massive scale also ascertained the use of grid-based geometric compositions and organizations of space. Each part was part of a greater whole but celebrated as a recognizable sub-piece.

The use of this component based architecture along with advances in plastics produced systems for housing and building that proposed lightness, durability, simplicity and ease of assembly and disassembly as their contribution to prefabricated building systems for housing. B.S. Benjamin’s pleated plastic roof structure is one of such systems based on the repetition of a geometric shape to construct a larger framework for housing. The system is based on a double skin glass fibre oven-cured reinforced resin poured over a mould. The twin skin construction developed a hexagonal shaped roof part that is assembled on a modular grid of hexagons to compose larger interior space. Each unit had a three-meter diameter and its connection to the next unit included an elegant polyvinyl chloride (PVC) gutter that addressed to the joint as industrialization’s contribution to architectural detailing.


Difficulties in plastic construction such as fire resistance, resistance to harsh climates, and production costs of moulds made it difficult for such systems to be successful on a massive scale. However the legacy of such systems is once more becoming part of architectural language, as parametric based modeling tools and one-off fabrication capacity are mainstream. This part-based building system also has the potential to create an open-source ecology for architecture as each individual component is embedded with an assembly intelligence that permits greater variability of the whole system.  

Plastic Pleated Roof from Interbuild October 1966 










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