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Towards flexible and industrialised housing solutions

Posted on 24-02-2023

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Near the end of 2022 I had the chance to complete my first secondment of two months at La Salle, in Barcelona. This was a great opportunity to understand how the municipality of Barcelona, architecture firms and industry partners are developing more flexible and sustainable housing solutions that can accommodate new family structures and different ways of habitation.  Furthermore, it became the perfect occasion to reconnect with the state of the industry in my home country, increase my network of contacts and work hand-in-hand with my co-supervisor Nuria Martí.   

 

Within the Spanish territory, Barcelona is the city leading change with innovative housing solutions, promoting the creation of non-hierarchical and resilient distributions, and incentivising the use of industrialised construction through public competitions. This change of paradigm is not only increasing the current affordable housing stock, but is integrating new actors in the decision-making process through participatory practices. 

 

The main goal of my secondment was to develop a case study assessment methodology that would combine a taxonomical classification of the building systems and highlight the design strategies for each of the building layers (structure, façade, access and circulation, services and internal dividing elements). Ultimately, correlating these criteria with the type of customisation offered in the domestic space. Besides helping me establish the parameters to compare and classify the housing case studies, the interviews to practitioners also shed some light on some of the challenges ahead.

 

Support and infill

 

Habraken’s (1961) critical response to mass housing proposed an approach in which a dwelling should encourage adaptation and become an instrument to empower the user. This approach took into account different needs and time horizons dividing the building into 2 groups: the long-life components that constitute the communal structure, and the short-life components that respond to individual needs and can be modified without hindering the overall integrity of the system. This concept is strongly related to what Steward Brand (1995) proposed with his ‘Shearing layers of change’, which emphasized these layers to be differentiated according to their particular lifespans. Building upon the mentioned authors, Bernard Leupen (2006) suggested that it is precisely the permanence of the frame (known as support in the Open Building movement) that enables the generic space to be altered, extended or used in a variety of ways. More recently, Jeremy Till and Tatjana Schneider (2007) conveyed the idea that “the most productive approach to prefabrication for flexible housing is probably not one that invents new systems from scratch, but one that assembles existing prefabricated elements in an adaptable manner.”

 

My research is therefore using a set of case studies to analyse the design strategies, construction system and level of industrialisation per building layer, identifying those that belong to the support, and defining the type and degree of customisation offered to the infill.

 

Non-hierarchical spaces

 

Due to the increasing variety of family structures and the pressing need to design resilient dwellings that can be adapted to future needs, recent housing developments in Barcelona are proposing non-hierarchical distributions. Spatial polyvalence is essential to enable the flexibility for user customisation (Hertzberger, 1991). Flexibility has become a prerequisite for today’s collective housing solutions and, moreover, it is a strategy that promotes gender equality in distributions. Gender equality seeks to break with the traditional role division in the domestic space and promotes the involvement of all family members in the household tasks, for example by bringing the kitchen to a visible and central position as opposed to secluded and closed-off (Montaner et al., 2019).

 

An example of a non-hierarchical, flexible and gender-equal solution is the award-winning 85 social housing units in Cornellà by Peris + Toral Arquitectes which proposes a matrix of connected rooms that allow the user to inhabit the space in multiple ways. The 3.6 x 3.6 module promotes porous distributions, non-linear circulation, and adaptability throughout time. This is also the case in the Illa Glòries by Cierto Estudio, which I was lucky enough to interview while on my secondment. Aiming to create versatile homes that can be adapted to the tenant’s changing needs in a simple and reversible way, the connections between adjacent spaces are multiplied while the corridors are removed. A central room ‘rótula’, makes it possible to create diagonal visual connections and increase the circulation possibilities while conferring independence to the surrounding rooms. This matrix of non-hierarchical rooms creates a dynamic housing aggregation system, where the limits of the flats have the potential to vary and different layouts are possible.

 

Industrialised public housing

 

In order to promote the use of industrialised construction methods, the IMHAB (Institut Municipal de l’Habitatge I Rehabilitació de Barcelona) has created several public housing competitions where the architect, the consultants and the construction company had to work collaboratively from the early stages of the design. Some of the objectives the IMHAB sought to achieve through these public competitions were the acceleration of the production processes, the reduction of the carbon footprint, the increase of the quality of the buildings and shortening the execution time. The resolution of the proposals shows a growing interest in the use of engineered timber components such as CLT or glulam. The design teams highlighted several benefits in using this material as the reduction of the embodied emissions, the lower costs of foundations due to a lighter structure, or the increased precision when prefabricating components with computerised numerical control (CNC). Additionally, companies as 011h are collaborating with design teams to digitalise their kit of parts in such way that the data can be utilised throughout the entire process of design, manufacturing and assembly. This high level of digitisation requires a greater coordination between stakeholders on early stages of the design and could become a tool to provide mass-customised dwellings at an affordable price.

 

However, the slow adoption of digital technologies, limited wood suppliers, and the strict Fire Safety and Acoustic regulations in Spain, have become major barriers when using engineered timber in housing. To comply with the regulations, most of the projects had to incorporate wet screeds after the dry construction, hindering the possibility to disassemble the components for future reuse or recycling.

 

Flexible housing solutions

 

Flexibility is necessary to allow for the customisation of housing in the short term and ensure the adaptability in the long term. The way architects and industry professionals define the built environment impacts enormously on the transformation capacity that housing has to incorporate different needs over time. This flexibility is tightly linked to dimensions, design strategies and construction systems, and can contribute to a democratisation of design by integrating new voices in the process. Barcelona turned out to be an extremely useful secondment to understand how some of these strategies and construction systems are implemented in practice.

 

 

References

 

Brand, S. (1995). How Buildings Learn: What Happens After They’re Built. Penguin Books.

 

Habraken, N. J. (1961). Supports: An Alternative to Mass Housing. Routledge. https://doi.org/10.4324/9781003014713

 

Herman Hertzberger. (1991). Lessons for Students in Architecture. 010 Publishers.

 

Leupen, B. (2006). Frame and Generic Space. 010 Publishers.

 

Montaner, J. M., Buron, J., Mira, A., Valiño, V., Prats, M., Font, G., Ventura, N., & Palay, J. (2019). Flexibilidad e igualdad de  género en la vivienda.

 

Schneider, T., & Till, J. (2007). Flexible housing. Elsevier.

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