Building Envelope

ArchDaily Topic

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When discussing sustainability in construction, we are used to an approach based on complex technological solutions, expensive sensors, costly materials and, most recently, artificial intelligence. But what if everything we are looking for (in terms of sustainability) could come from the materials themselves, taking advantage of their intrinsic properties, without even relying on electricity? The use of hygromorphic materials offers an innovative perspective and sheds light on little-explored possibilities in the field. These materials can adapt to variations in environmental humidity, changing their shape, size or other physical properties. Examples in nature include wood, hygroscopic proteins such as collagen, polysaccharides such as cellulose and chitin, hygroscopic minerals such as certain salts and silica gel, as well as spores and pollen grains; all of which exhibit the ability to absorb or release moisture in response to changes in humidity. In architecture, researchers have been striving to develop materials, particularly for façades, that can take on a life of their own and make buildings more comfortable naturally.

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.

According to the climatic conditions of each region and its implantation environment, exterior enclosures play a fundamental role in providing the necessary climatization and ventilation conditions to make indoor spaces habitable and comfortable. While there are various bioclimatic strategies and designs that can be applied to achieve energy efficiency, the determination of materiality, the choice of hardware, and the definition of opening and closing technologies contribute to the performance of facades, providing functionality and a high degree of adaptability to contemporary uses, among other factors.

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. 

The early 20th century marked a pivotal era in Brazilian architecture with the advent of the modernist movement. Architects like Oscar Niemeyer or Lúcio Costa introduced avant-garde designs characterized by sleek lines, reinforced concrete, and a focus on functionality. What's more: residential projects of the era, in particular, blurred the lines between indoor and outdoor, flawlessly merging interior and exterior spaces to reflect a lifestyle that harmonizes with nature. Fast forward to the present day, and contemporary architects and designers in Brazil continue to embrace the challenge of creating indoor-outdoor homes that nod to the country's tropical climate. These residences often feature open floor plans, expansive glass walls, and strategic positioning of courtyards, gardens, or terraces with a design philosophy that emphasizes natural light, ventilation, and the incorporation of greenery for increased well-being. We take a detailed look at four recently completed residential projects in Brazil that fuse contemporary architecture, sustainable living, and a deep appreciation for their natural surroundings.

When delving into the envelope of construction and examining how the interior relates to the exterior, the concept of greenhouses emerges as an opportunity to cultivate life indoors, whether dependent on external factors or not. Defined as spaces enclosed by glass or other transparent plastic materials, greenhouses facilitate the growth of vegetables and ornamental plants even during periods of adverse external weather conditions. However, what does designing for plants involve? Climate, species, structural design, and the type of covering are just a few of the considerations to take into account.

Environmental comfort is one of the aspects that contribute to the good performance of architecture. In project descriptions, the incidence of natural lighting and ventilation is often highlighted as advantageous characteristics that add to the aesthetics and functioning of the program. In a way, environmental comfort is part of the building's function, not necessarily linked to the activities that take place inside the construction but plays a role in its development.

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.

The principles of the circular economy have been most influential and applicable to the construction industry. Emphasizing the efficient use of resources, models around reuse and recycling of components and materials are increasingly being pioneered by global architecture practices. The concept of "design for disassembly" has emerged as an innovative approach especially in the case of building facades. Striking a balance between the demands for new infrastructure and the transition towards sustainability requires a review of traditional facade design throughout its lifecycle.