With the Pullover project, an ecologically, economically and socially sustainable and future-oriented educational building with a high level of innovation and low maintenance and operating costs is to be created on the Polyfeld campus in Muttenz for the future Muttenz grammar school and the GBA centre for bridging courses. The refurbishment building should be naturally integrated into the new educational campus and reflect the existing and the new in equal measure.
The architectural expression of the future GBA builds on the features of the original building, both internally and externally, and develops them further in line with the new needs and requirements in an efficient and resource-conserving manner.
The current vocational college building from 1971 will be stripped back to its shell. The existing core and stairs will be retained and will continue to be used for their intended purpose. Only the lift capacity will no longer meet future requirements, which is why the core will be extended with three new lift shafts.
Invited competition
Campus Polyfeld
Education
Muttenz Switzerland
In order to achieve an optimal floor area ratio, the existing concrete structure will be extended to the south and west by an axial grid with a self-supporting timber construction. The additional storey and the ventilation centre on the roof are also constructed in timber. The timber construction with an appropriate and functional grid and the direct load transfer throughout form an efficient load-bearing structure.
The new ceilings are formed by prefabricated timber and clay elements.
With its heat storage capacity towards the south and west, the wood and clay construction material not only supports passive climate regulation, but also creates a pleasant learning environment.
The extended building has almost identical proportions to the original building. The southern extension defines the entire depth of the campus square to the west.
The interventions in the surroundings are minimal and are limited to the necessary adjustment of the terrain and the associated connection to the existing car park to the west and north.
The building envelope is characterised by a simple construction using prefabricated elements with a high degree of prefabrication which, like the timber supporting structure, allows quick and precise assembly on site. Prefabricated timber elements form the parapet bands, which are mounted on the columns and the outer beams of the primary structure.
The existing metal vertical sliding windows, which are characteristic of the existing building, will be reused and fitted with new triple insulating glazing. Additional weather-protected ventilation flaps for night-time cooling complement the window elements.
The outer cladding of the columns consists of storey-high, thin-walled moulded parts made of coloured fibre cement. This durable and lightweight material allows for a simple substructure and is characterised by a very low CO2 content in its production.
The parapet strips clad only with wind paper are additionally protected by the curtain-type PV panels coloured in Morpho technology, which are inclined outwards to provide a protected space for the round blind boxes for the ZIP blinds and improve the yield of solar energy.
This arrangement and the ideal proportions between the windows without solar control glazing and the closed parapets allow both efficient thermal insulation in summer and optimised solar gain in winter. This leads to a significant reduction in heating requirements.
Architecture:
Studio Gugger
Civil engineer/Timber structures
MWV Bauingenieure AG
Building services:
Waldhauser + Hermann AG
Sustainability:
Nova Energie Basel AG
