Establishing thermal comfort once demanded a far more deliberate and calibrated architectural intelligence—an interplay of orientation, massing, material behavior, ventilation potential, shading, and the ways daylight and surfaces absorb and release heat. This was not simply a matter of taste, but of necessity. When many of Hong Kong's post-war modernist buildings were constructed in the late 1960s and 1970s, forming a substantial portion of the city's public housing and broader residential stock, air-conditioning was not yet a ubiquitous, default service. Cooling, where present at all, was limited and unevenly distributed; comfort had to be negotiated through passive means, through section, façade depth, operable openings, and climatic detailing. It was only later, particularly through the 1970s and 1980s, as air-conditioning became increasingly standardized across the region, that mechanical cooling began to displace this earlier matrix of architectural decision-making.
Did air conditioning negatively affect architectural space, particularly in Hong Kong and the nearby region? The more precise claim is that widespread reliance on AC has profoundly rearranged the incentive structure of building design.
Much more than merely as a protective skin, the building envelope functions as a thermal regulator that influences operational energy demand, indoor comfort, and long-term efficiency. And before renewable systems or mechanical strategies are introduced, performance begins in section. The way walls, roofs, windows and floors are layered determines how much heat is lost in winter, gained in summer, and ultimately how much energy a building consumes. At the center of this evaluation lies a fundamental metric: the thermal transmittance, or U-value. Understanding how to calculate it is essential for assessing whether an envelope conserves energy or allows it to escape.
Conceptually, thermal transmittance relates heat flow to both surface area and temperature difference. It expresses how much energy crosses one square meter of envelope for each degree of thermal gradient between its two faces.
If we divide 1 m2 of our envelope by the temperature difference between its faces, we will obtain a value that corresponds to the thermal transmittance, also called U-Value. This value tells us a building's level of thermal insulation in relation to the percentage of energy that passes through it; if the resulting number is low we will have a well-isolated surface and, on the contrary, a high number alerts us of a thermally deficient surface.
Modern residential construction in the UAE demonstrates the need for advanced thermal envelope solutions in hot, arid climates where cooling can account for up to 70% of peak electricity consumption. Image Courtesy of Terraco
Terraco, a global leader in Exterior Insulation Finishing Systems, has demonstrated through independent studies that when planning building renovations, it is essential to adopt a deep retrofit strategy that includes energy-efficient measures, such as thermal insulation of external walls and roofs.
The studies show that cooling energy use in buildings can be reduced by up to 47% annually in Middle Eastern and South Asian climates, directly as a result of installing the combined Terraco EIFS and Roof Insulation Finishing Systems, compared to leaving external walls and roofs uninsulated.
There is growing awareness around sustainability—and the environmental cost of prematurely demolishing safe, structurally sound buildings only to replace them with new construction. In the broader race to reduce carbon emissions, corporations and institutions are placing greater emphasis on ESG performance (environmental impact, social responsibility, and governance). Many now require carbon accounting, set "carbon-neutral" targets, or purchase carbon credits to offset footprints.
This shift, together with a wave of exemplary adaptive-reuse projects worldwide—Herzog & de Meuron's Tai Kwun in Hong Kong, Powerhouse Arts in Brooklyn, David Chipperfield's The Ned Doha, and Xu Tiantian's transformations of factories, quarries, and rammed-earth fortresses in China—has accelerated serious reconsideration of reuse as a primary development strategy. Yet despite its many benefits, adaptive reuse is still not as prevalent as it could be. Why and what might be the main obstacles and tensions?
The future of the architecture industry holds countless possibilities, as research in the domain progresses. One innovation is the ability for structures to be rendered acoustically invisible, absorb earthquake energy, or harvest electricity from the sounds around them. Qualities of this nature can help redefine the functionality and sustainability of buildings. Architects and scientists are at the forefront of this creation. What makes this possible are metamaterials that could offer alternative methods of designing good buildings.
The installation and exhibition representing Estonia at the 19th International Architecture Exhibition of La Biennale di Venezia is curated by architects Keiti Lige, Elina Liiva, and Helena Männa. Titled Let Me Warm You, the national exhibition explores different dimensions of sustainability by questioning whether insulation-driven renovations in Estonia are simply compliance measures to meet European energy targets or whether they can also serve as opportunities to enhance the spatial and social quality of mass housing districts. To make this point, the Estonian installation covers the façade of a Venetian building with insulation panels, replicating how they are commonly installed in Estonia for mass housing renovations.
In 2024, a diverse range of topics have been comprehensively explored, some focusing specifically on architectural details and construction systems. These articles provide valuable insights into architecture's often-overlooked technical and functional aspects. By shifting attention away from aesthetics, materials, and spatial massing, they reveal the importance of intricate details and the construction systems underpinning contemporary projects' larger architectural vision.
Executing these seemingly small elements is crucial in shaping how architecture is perceived and experienced. Specifying and drawing a thoughtfully designed detail is not dissimilar to determining the correct screw in building a car—its thread count, material, and length—can dramatically influence not only the success of an architectural design but also the quality of the human experience it fosters. Such details, while often dismissed as mundane and may not be the most recognizable features of stellar projects, profoundly impact the cohesiveness and functionality of architectural projects.
As we move past Thanksgiving and step into December, the festive season is fast approaching. This time of year brings celebrations, holidays, and travel plans into full swing. Particularly in the Northern Hemisphere, there is a strong association between end-of-year festivities and cold, snowy weather.
Among the many traditions that celebrate the season, one of the most logistically and architecturally challenging is arranging for the giant Christmas tree for Rockefeller Center in New York City. This spectacle of moving a 70+ foot, 10+ ton tree into one of the busiest city centers in the world continues to capture the holiday spirit annually.
Over-providing traditionally implies offering more than is necessary, often carrying a negative connotation due to the potential for excess and waste. However, could there be scenarios within the built environment where over-providing proves advantageous? The question critically examines how overprovisioning might enhance a building's flexibility and adaptability to diverse and evolving conditions.
The underlying assumption of accurately providing what is needed for a building is that stakeholders—including owners, architects, and designers—can accurately predict and cater to a structure's current and future needs. This assumption, however, is challenging to realize, as societal, economic, and cultural shifts frequently occur in unpredictable ways. In this context, over-providing emerges as a counterintuitive yet potentially beneficial strategy. As buildings and structures inevitably transform, those designed with inherent adaptability reduce the need for costly renovations or complete rebuilds.
Thermal mass is the ability of a material to absorb, store, and release heat. Used to moderate building temperatures by reducing fluctuations, the concept is crucial in improving energy efficiency. Materials with relatively high thermal mass, such as stone, concrete, rammed earth, and brick, can absorb significant heat during the day and release it slowly when temperatures drop at night, reducing the need for heating and cooling systems. Properties like heat capacity, thermal conductivity, and density are all considered when assessing the thermal mass property of a material.
A Trombe wall is a passive solar building feature that enhances thermal efficiency. Positioned on the sun-facing side of a structure, it consists of a wall made from materials like brick, stone, or concrete, and a glass panel or polycarbonate sheet placed a few centimeters in front of it. Solar radiation penetrates the glass during daylight hours and heats the masonry wall. This wall then slowly releases the stored heat into the building during the cooler nighttime hours, maintaining a more consistent indoor temperature without the need for active heating systems.
Introspection, Elevation, Covering-Up. Image Courtesy of Enrique Tovar
The flexibility of architecture allows it to continuously change and adjust its form in response to technological progress, social and artistic trends, and the collective experiences we undergo. Large-scale global events, such as the transatlantic migrations of the 19th century, the impact of tuberculosis on design, and most recently, the effects of the last major global health crisis (COVID-19), have all played significant roles in shaping the evolution of architecture.
In the context of the climate crisis, the role of architecture and urbanism has been extensively debated, as it represents one of the greatest challenges of this century. It is undeniable that while there are active efforts through policies and innovation to prevent reaching a point of no return, architecture is already adapting to the changes and extreme conditions caused by it. Rather than thinking of a distant or dystopian future scenario, the gradual changes in climatic conditions have been drivers for modifying, through architectural operations, how we conceive contemporary buildings.
https://www.archdaily.com/1015368/introspection-elevation-covering-up-radical-architectural-operations-for-adverse-climatesEnrique Tovar
The manipulation and combination of materials are ongoing pursuits in architecture. This has not only broadened the possibilities for construction but also enabled the creation of distinctive shapes and aesthetics by using the same materiality. An example of this is Portland cement, an essential element in the mixture of water and aggregates that make concrete, which allows the creation of both load-bearing and decorative elements. In parallel, as a result of the exploration of innovative materials, fiber cement emerged (invented by Ludwig Hatschek) at the end of the 19th century, combining Portland cement, mineral-based materials, and cellulose fibers.
Nowadays, fiber cement —distinguished by its key technical qualities of slenderness, lightness, durability, and flexible aesthetics— has stood out in various applications associated with design, ranging from furnishings to facade systems. It is in the latter where it has adopted notable expressions due to its textures, incombustibility, rain resistance, and malleability. For this reason, we have developed a design guide that addresses the use of fiber cement, exploring the principles that should be considered when designing the facade, regarding its materiality, dimensions, layout, details, and special applications.
https://www.archdaily.com/1011851/design-guide-working-with-fiber-cement-facadesEnrique Tovar
Bradbury Works / [Y/N] Studio. Image Courtesy of [Y/N] Studio
In the contemporary context, global warming has marked a turning point in the way we think about architecture. We are witnessing record temperatures on our planet and a challenging panorama in many large cities, characterized by heatwaves and, in some cases, more severe winters. These circumstances have triggered a cycle in which the demand for heating and cooling systems increases, which, in turn, translates into higher energy and operating costs for buildings.
Given this situation, it becomes imperative to design energy-efficient buildings to reduce both the environmental impact and the associated costs. One of the strategies to achieve this is to properly plan the facade, which, serving a function similar to the building's skin, can help reduce the energy required for heating and cooling. In this context, the polycarbonate panels developed by Rodeca contribute to the energy efficiency of buildings, in addition to their lightweight, slender construction, and translucent aesthetics.
https://www.archdaily.com/1009134/ecological-lightweight-and-slender-energy-efficient-architecture-with-translucent-polycarbonateEnrique Tovar
Image created using AI under the prompt: An emotive and detailed illustration of the texture of various types of architectural insulation. Image via DALL.E 2
Although more related to evolutionary aspects than to architecture itself, the inherent physical fragility of human beings has required, since prehistoric times, that we protect our bodies and our buildings from external elements. As an example, beginning with the primitive huts used in the earliest forms of domestic architecture, furs were employed as an exterior covering to restrict the flow of air and, consequently, regulate the interior environment.
Subsequently, we have observed an evolution that clearly shows advances in insulation techniques, going from vernacular materials such as adobe to an increase in the thickness of walls using stone or brick, finally reaching the cavity walls developed in the 19th century, which left a small air chamber between an exterior and an interior face of the wall. Its later popularization led to the introduction of insulation between both faces, a system that is widely recognized and used today and has laid the foundations for further developments in this field.
https://www.archdaily.com/1008656/a-glimpse-into-the-evolution-of-insulation-materials-in-architectureEnrique Tovar
One of the primary functions of architecture is to provide shelter, fulfilling the physiological and safety needs at the base of Abraham Maslow's hierarchy of human motivation. Throughout history, the need for shelter has been evident in our ancestors’ behavior, who sought refuge in caves to protect themselves from weather conditions and predators. As societies shifted from a nomadic to a sedentary lifestyle and basic needs were easily met, shelters became more advanced, evolving into purpose-built spaces. These early shelters withstood the elements of their time and laid the foundation for modern architecture as we know it today.
Today, extreme weather conditions due to climate change are testing cities, buildings and materials. Venice is flooding, and the Svalbard Global Seed Vault is experiencing melting ice. Without action, conditions will continue to worsen, increasing the need for efficient strategies that allow us to coexist with the environment and to develop more resistant materials for our buildings. An example of these materials of the future is NATURCLAD-B, a high-quality, maintenance-free wood panel system designed for architecture, interior design and construction.
https://www.archdaily.com/1000043/climate-proof-architecture-supertextured-cladding-for-extreme-conditionsEnrique Tovar
The 2022 FIFA World Cup was unique as the first FIFA tournament held in the Middle East. In another first, the FIFA World Cup, historically held between June and July, was moved to November and December, in view of Qatar’s 40˚C+ climate during the summer months. Even during the cooler months, Qatar’s average temperature reaches 26˚C. Combining this with the heat emitted by tightly packed spectators would at times have made the experience uncomfortable. As a result, Qatar air-conditioned eight of the nine open-air football stadiums – a significant challenge which was overcome through innovative design, technology and architecture and by utilizing spot cooling; and a complex undertaking when it is also important to maintain sustainability credentials.
To effectively cool the stadiums, the most crucial challenge was to prevent or at least reduce the hot air from outside coming into the stadium, which was achieved through the stadiums’ design and architecture.
