When talking about energy efficiency in buildings, it is inevitable to mention thermal insulation. We rarely see it in a finished building and, even in the technical drawings, the insulating layer appears as a thin hatch. But this is an element that is of vital importance, as it acts as a barrier to the flow of heat, hindering the exchange of energy between the interior and the exterior, reducing the amount of heat that escapes in winter and the thermal energy that enters in the summer. In a building with good thermal insulation, there is less need for heating to keep the house at a pleasant temperature, also reducing its carbon footprint. Currently, there are many countries that require a minimum level of thermal insulation for buildings, with increasingly strict parameters. But how should this issue be dealt with in the near future, with the worrying climate crisis forecast?

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In the face of an unprecedented climate crisis, green roofs are increasingly establishing themselves as a global architectural trend, providing multiple social, economic, and environmental benefits in urban areas. Following the example of pioneering models like Copenhagen's, cities around the world are replacing gray roofs with green ones in an effort to move toward a more sustainable and healthy future. As a result, integrating green roofs has become a recurring practice in projects aiming to address the inherent challenges of the contemporary city.

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The relationship between building envelope and structure remains a centerpiece of architecture. Understanding a building's skin is how designs become open or closed, controlling environmental conditions, light and views. Whether perforated, slotted or modular, brise-soleils are elegant envelopes that create new spatial conditions. This is especially true in France, where architects are rethinking tradition to bring new screened structures to life.

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Researchers credit the Hanging Gardens of Babylon as the first examples of green roofs. Although there is no proof of its exact location and very little literature on the structure, the most accepted theory is that King Nebuchadnezzar II built a series of elevated, ascending terraces with varied species as a gift to his wife, who missed the forests and mountains of Persia, their local land. According to Wolf Schneider [1] the gardens were supported by brick vaults, and under them, there were shaded halls cooled by artificial irrigation of the gardens, with a much milder temperature than the outside, in the plains of Mesopotamia (present-day Iraq). Since then, examples of green roofs have appeared all over the world, from Rome to Scandinavia, in the most diverse climates and types.

Nevertheless, inserting plants on roofs is still viewed with suspicion by many, as they are thought to be costly and difficult to maintain. Others, however, argue that the high implementation costs are quickly offset with savings in air conditioning and especially that occupying the building's fifth façade with vegetation is, above all, a rational solution. In any case, the question remains as to how green roofs can really help with climate change.

“We need a new spatial contract." This is the call of Hashim Sarkis, curator of the Venice Biennale 2021, as an invitation for architects to imagine new spaces in which we can live together. Between a move towards urban flight and global housing crises, the growth of more low-rise, dense developments may provide an answer in the countryside. Turning away from single family homes in rural areas and suburbs, modern housing projects are exploring new models of shared living in nature.

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Few things irritate us more than exposure to excessive noise or inability to hear what we need to hear. Whether it's a nearby construction site, highway traffic, air conditioning, or a neighbor learning saxophone, research shows that noise can contribute to cardiovascular disease, high blood pressure, headaches, hormonal changes, sleep disturbance, reduced physical and mental performance, and the reduction of well-being. On the other hand, in an acoustically "comfortable" environment, in addition to listening to what we want, we focus better and feel calmer.

The concern about creating acoustically comfortable environments is often relegated to cinemas, concert halls and recording studios. But it is particularly important in learning environments, such as classrooms, as it directly influences the teaching-learning relationship. Acoustic discomfort can harm the process of knowledge acquisition, interfering with attention and worsening student-teacher communication.

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Designers have created civic institutions, governmental centers, public plazas, and many other spaces as testaments to individual and shared values. As spaces for gathering and exchange are necessary elements to urban life, architecture can also act as a vehicle to encourage understanding. Advocating knowledge while empowering the public, libraries celebrate ideas, curiosity and empathy.

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In a 2016 survey of 400 employees in the U.S., Saint-Gobain found that office building occupants commonly complained about poor lighting, temperature, noise, and air quality, leading the company to deduce a need for improved lighting and thermal comfort in buildings while also maintaining low energy consumption and freedom of design for architects and clients. Their solution was SageGlass, an innovative glass created first in 1989 and developed over the course of the past three decades. The glass, which features dynamic glazing protecting from solar heat and glare, simultaneously optimizes natural light intake. A sustainable and aesthetic solution, SageGlass’ adaptability to external conditions dispels the need for shutters or blinds.

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2020 has fundamentally changed our spatial routines and the current health crisis brought about a significant amount of speculation regarding how our daily lives will unfold onward. With the year coming to an end, we look at how the pandemic accelerated some architecture trends that were already underway, and how it brought into question other well-established ideas.

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On behalf of the entire ArchDaily team, we would like to thank you for your continued support and for making 2020 our best year so far! We are now reaching more architects around the world and inspiring them in the creation of better built environments. With more than 5500 different projects published during the year, our curators are excited to share this collection of the 100 most visited projects of 2020. This selection represents the best content created and shared by the ArchDaily community over the past 11 months.