The main role of architecture is to create structures that protect us from the environment and create spaces that are safe and comfortable for all types of needs and activities. By providing shelter, architecture also shapes the way people interact with their surroundings. Building technologies of the past rarely managed, however, to create a complete separation between us and the outside world.
While impermeability was a desired outcome, the porous building materials available always allowed some water, wind, or outside particles to leak into the interior spaces. In contrast, modern technologies now allow for almost completely impermeable building envelopes, allowing for complete separation between indoors and outdoors, thus relying on engineered systems to regulate temperature, airflow, or humidity. This article explores the differences between these two contrasting approaches, exploring how building facades are equipped to regulate indoor comfort and its environmental impact.
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.
In the evolving landscape of architecture and urban design, bioclimatic and biogenic envelopes present a compelling vision for future cities. Dr. Arta Yazdanseta, a Doctor of Design focused on energy and environments, dives into the intersection of design, building performance, and plant biophysical ecology. With a focus on bioclimatic and biogenic envelopes, Dr. Yazdanseta examines how these typologies can enhance socio-natural systems by leveraging their self-organizing potential. Dr. Yazdanseta’s academic journey includes earning a Doctor of Design and a Master of Design in Energy and Environments from the Harvard Graduate School of Design.
Her contributions as a researcher at the Harvard Center for Green Buildings and Cities include developing environmental design strategies and performance analyses for the HouseZero carbon retrofit project. In this interview, Dr. Yazdanseta explores the concept of bioclimatic envelopes and their interaction with passive architectural design principles. With a potential to revolutionize urban environments, the interview reveals insights into her research, the benefits of plant-based materials, and the future of sustainable architecture, emphasizing the critical connection between human and environmental health.
Formally, transparency usually takes the shape of a window, a door, a curtain wall, or a skylight. These are commonly created through rectangular punched openings or in the form of glass curtain wall systems or translucent screens. The following projects play with traditional notions of transparency and window-making in playful and unconventional ways. They create visually striking facades and dynamic relationships between their exterior and interior. They filter light and frame views through their glazing and opening articulation to craft memorable architectural experiences.
Porches in New Orleans. Image via William A. Morgan / Shutterstock
Positioned between the streetscape of a neighborhood and the privacy of the interior of a house lies the porch. Taking on the role of an entrance, a window to ponder out of, a gathering spot, and a stage, the porch has come to represent community and identity for many neighborhoods in the United States. Made of various stylistic elements of different sizes and shapes, these tie together neighborhoods by creating an interstitial space between the home and the street, weaving together the family life inside the house and the public life outside it, and creating a space between the private and public for both serendipitous encounters and for pausing. The porch has often been displayed in film and literature as the stage of profound and life-changing conversations, representing a comfortable threshold between the domestic and public realm in which to linger.
Architecture has always played a key role in providing shelter and protection for human beings. In prehistoric times, we sought refuge in caves, taking advantage of rock structures for protection against the natural elements and predators. Over time, shelters began to be made from materials found in nature, such as branches, leaves, and animal skins, evolving into more permanent and complex homes, with walls made of stone, bricks or wood, roofs to protect against rain and sun, and doors to control access. As we developed more advanced building skills, we used materials such as wood, stone, and clay and architecture evolved significantly, with the construction of temples, palaces, and fortifications that provided not only shelter but also symbolized power, status, and cultural identity. Even so, our buildings can continue to be seen as shells that protect us from the outside world.
From the massive stones of Greek temples to glazed skyscrapers, we work with a range of possibilities and thicknesses to separate what we consider internal and external. This article seeks to explore this diversity of thicknesses in architecture, from simple materials to complex construction techniques, highlighting how this variation not only provides protection but also influences our perception and interaction with the built environment.
https://www.archdaily.com/1014920/from-thin-veils-to-thick-barriers-exploring-different-widths-in-architectural-envelopesJosé Tomás Franco and Eduardo Souza
Glass brick facades have emerged as a captivating architectural trend, blending the enduring elegance of glass with the robust strength of bricks. Glass bricks can as well be more thermally resistant than conventional glazing.
These facades add a pixelated effect that plays with light and shadow, perfectly transmitting light, while maintaining privacy. The way glass bricks facades soften and blend the views of the outside can increase calmness and focus. From sleek commercial buildings to avant-garde residential projects, glass brick facades continue to push the boundaries of architectural innovation, captivating both designers and observers alike.
As a highly transparent material that stands up to all but the most extreme of weather conditions, is easily formed into any size or shape, and, once formed, will last for thousands of years, glass is still one of the most innovative and crucial materials used in architecture. Although contemporary building practices allow us to form huge, glittering skyscrapers of glass that rise hundreds of meters into the air, the ancient material’s original purpose – to welcome light into weathertight and secure interiors – remains its most important more than a thousand years on.
As important as glass is to almost every typology of architecture in the form of windows, when it comes to the roof of a building, the use of glass is not so simple. We’ve understood the power and danger of combining light and glass ever since we saw a magnifying glass used to concentrate the heat of sunlight into incredibly high temperatures in children’s cartoons. Under a glass roof, the solar gain can make for uncomfortable internal environments without the correct protective precautions.
Rising demands for energy efficiency, technical functionality, and interior comfort in buildings necessitate the development of more efficient building envelope constructions. The building envelope serves as a mediator between a building's exterior and interior. In today's architectural landscape, it performs a multitude of functions to enhance the building's performance. These functions include building control systems, energy supply (such as gas and electricity), and heating, ventilation, and air conditioning (HVAC), among others. These elements primarily determine the functionality, efficiency, and safety of building spaces. Given that the nature of building envelopes heavily depends on these services, how can they serve as primary frameworks for building design development?
When we talk about the building envelope, we often make the analogy of a skin that protects and wraps the structure, creating a transition in the physical environment. This concept is interesting as it identifies that, similar to its function in humans, the skin plays a role in protecting and regulating the interior setting, besides contributing to the aesthetics of the building. In this way, both the human skin and the building envelope act as elements that respond to the stimuli of the surroundings and the life that develops within them. More than just protective barriers, they are experienced as means of active interaction with the context.
While envelopes evolve within diverse contexts, materials, and systems, minimalist windows distinguish themselves through their aesthetic qualities by being transparent and fluid skins. These windows excel with their functionality and visual lightness, standing out in the architectural landscape. In addition, they are noteworthy thanks to their versatility across different systems that connect life within the interior and exterior. Considering Swiss and Pritzker Prize-winning architect Peter Zumthor's statement that "architecture is exposed to life,” windows play a vital role in expressing that connection, becoming a significant part of the building's identity and essence.
https://www.archdaily.com/1013905/reframing-the-concept-of-building-envelope-through-minimalist-windowsEnrique Tovar
Bate Borisov Arena / OFIS Architects. Image Courtesy of Euramax
Building envelopes create a physical boundary or shell integrated to the outer skin of a structure, separating indoor and outdoor environments. By assembling architectural components such as walls, roofs, windows and doors, the building is enclosed to provide protection and insulation, playing a determining role in the energy efficiency, comfort, structure, and durability of the project. Through multiple styles and shapes, they are key to giving character to a building, its visual appearance and integration with the surrounding environment.
Maintaining the fundamental functions of an envelope while playing with aesthetic possibilities, Euramax’s tailor-made metal cladding solutions create unconventional, colorful envelopes for designing with innovative geometries, patterns, and configurations.
“Color is life; for a world without color appears to us dead.” Distinguished painter Johannes Itten described with these words the exceptional power of color in our perception of the world. As a sensory event, color not only defines what we see, but also how we feel and think; it has been shown to alter productivity, inspire decision-making, shape our perspective, and influence our well-being. Especially in architecture, these effects materialize and reach their maximum splendor. Design is, after all, a visual form of communication, and color palettes –coupled with light, shadow, texture and sheen– play a critical role in conveying a building’s message. They create the ambiance that supports the function of a space, completely transforming user experience. Even the greats have recognized this power: “Polychromy is as powerful an architectural tool as the plan and section,” Le Corbusier once said.
CODE Building / Wolf Ackerman, EskewDumezRipple. Image Courtesy of Kingspan
A 2022 United Nations report claims that the negative impacts of the climate crisis are mounting much faster than scientists predicted less than a decade ago. Rising greenhouse-gas emissions could soon outstrip the ability of many communities to adapt, and the consequences will continue to hit the world’s most vulnerable populations. As climate scientist Maarten van Aalst suggests, “Any further delay in global action on adaptation and mitigation will miss a brief and rapidly closing window of opportunity to secure a livable and sustainable future for all.” The data is clear: to protect our planet, we need to prevent a 1.5°C rise in global temperatures this century. To do so, the world must achieve a 45% reduction in global carbon emissions from 2010 levels to 2030, to then reach a net-zero state by 2050. It is evident, however, that we are on track to miss this goal by a substantial amount. The clock is ticking, and every industry should act fast (and drastically) to even dream of greener cities.
Blending in with its urban context or standing out to draw attention, a façade tells a building’s story. It is an expressive medium through which we engage with architecture, defining first impressions and setting the tone for the interior by experimenting with transparency, movement, texture and color, among other aesthetic possibilities. Of course, the envelope also plays a crucial functional role, acting as a protective barrier against extreme weather conditions and directly impacting light transmittance, energy efficiency and acoustic comfort. Architects therefore face an important challenge: to achieve a balance between an attractive look and performance. To do so, it is pivotal to specify the right materials during the design stage.
Brooke Street Pier / Cinca Morris Nunn. Image Courtesy of Danpal
In architecture, the concept of daylighting refers to when buildings allow natural light inside to provide a number of benefits, from enhanced visual comfort and productivity, to improved health and higher energy savings. However, to reach optimum levels of sunlight, reaching a balance is key; while too much can produce an uncomfortable glare and tremendous amounts of heat, too little can lead to health deficiencies and a greater dependency on artificial lighting. In that sense, the qualities of polycarbonate panels are unmatched, becoming an attractive choice for facades and roofs by achieving a soft, diffused light with varying levels of transparency, brightness and opacity.
The total energy demand from buildings has risen dramatically in recent years. Driven by improved access in developing countries, greater ownership of energy-consuming devices and increasing urban densities, today it accounts for over one-third of global energy consumption and nearly 15% of direct CO2 emissions. As the climate crisis aggravates and its consequences are more visible than ever, the architecture and construction industry must respond accordingly. It must take responsibility for its environmental impact and give priority to reducing energy consumption, whether through design decisions, construction techniques or innovative products. The key lies, however, in not sacrificing aesthetics and comfort in the process.
Whether blending in or standing out, embodying transparency or solidity, expressing coarseness or softness, a façade is the medium through which we engage with architecture. It tells a story and can often set the tone for the rest of the interior. But apart from defining a purely visual experience, a building’s envelope must also be practical, durable and have the ability to properly manage natural lighting and ventilation needs. After all, by being the point of contact with the outside, it is responsible for mitigating sounds and providing protection from climatic conditions, such as wind, rain, heat and humidity. Therefore, when designing a facade, it is important to consider a balance between performance and a beautiful aesthetic. Of course, many materials successfully meet these criteria. But when it comes to creating a comforting, light-filled ambiance while ensuring resistance, ease of installation and versatility, the properties of translucent polycarbonate panels seem to be unparalleled.
Composed of microcell panels, polycarbonate offers various solutions for the use of natural lighting in architectural enclosures. Whether applied to facades, interior spaces or roofs, the benefits of polycarbonate, such as lightness, clean lines, colored panels, and light effects, offer a wide range of design freedom. Microcell panel technology reduces the need for artificial light and favors uniformity in the diffusion of natural light, achieving energy efficient facades and the illusion of spaciousness in interior spaces. Below, we've selected 10 projects that have used polycarbonate as a wrapping material.
