Manual of Section
By Paul Lewis, Marc Tsutumaki and David J. Lewis
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About this ebook
Paul Lewis, Marc Tsurumaki, and David J. Lewis have developed seven categories of section, revealed in structures ranging from simple one-story buildings to complex structures featuring stacked forms, fantastical shapes, internal holes, inclines, sheared planes, nested forms, or combinations thereof. To illustrate these categories, the authors construct sixty-three intricately detailed cross-section perspective drawings of built projects—many of the most significant structures in international architecture from the last one hundred years—based on extensive archival research. Manual of Section also includes smart and accessible essays on the history and uses of section.
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Book preview
Manual of Section - Paul Lewis
Authors
The Vertical Cut
INTRODUCTION
This book presents the means for understanding the complex and important role that section plays in architectural design and practice. Discussion and debate of a particular building’s section are common in the study and practice of architecture. Yet there is no shared framework for the determination or evaluation of section. What are the different types of section, and what do they do? How does one produce those sections? Why would one choose to use one configuration of section over another? This book explores these questions and provides a conceptual, material, and instrumental framework for understanding section as a means to create architecture.
Our work has been motivated by the belief that the architectural section is key to architectural innovation. Given the environmental and material challenges that frame architectural practice in the twenty-first century, the section provides a rich and underexplored opportunity for inventively reimagining the intersection of structural, thermal, and functional forces. Moreover, the section is the site where space, form, and material intersect with human experience, establishing most clearly the relationship of the body to the building as well as the interplay between architecture and its context.
As practitioners and educators, we are invested equally in section as a type of representation and as a projective tool for spatial and material invention. We offer with this book a clear heuristic structure for a more robust discourse around the architectural section, to establish a shared basis for dialogue toward explorative and experimental architecture. Newly generated section perspectives of sixty-three significant built projects, organized into seven distinct types, provide students, architects, and other readers with a foundation for further cultivation of the section.
LTL Architects, Park Tower, 2004
WHAT IS A SECTION?
We begin with the seemingly obvious question What is a section?
In reference to architectural drawing, the term section typically describes a cut through the body of a building, perpendicular to the horizon line. A section drawing is one that shows a vertical cut transecting, typically along a primary axis, an object or building. The section reveals simultaneously its interior and exterior profiles, the interior space, and the material, membrane, or wall that separates interior from exterior, providing a view of the object that is not usually seen. This representational technique takes various forms and graphic conceits, each developed to illustrate different forms of architectural knowledge, from building sections that use solid fill or poche to emphasize the profile of the form, to construction details that depict materials through lines and graphic conventions. In an orthographic section the interior is also described through interior elevations of the primary architectural surfaces, while the combination of a section with a perspective describes in depth the interior as a space, using the techniques of perspectival projection.
Because the section begins with the visualization of that which will not be directly seen, it remains abstracted from the dominant way of understanding architecture through photographs and renderings. Sections provide a unique form of knowledge, one that by necessity shifts the emphasis from image to performance, from surface to the intersection of structure and materiality that comprises the tectonic logic of architecture. At the same time, section demonstrates the exchange among multiple aspects of embodied experience and architectural space, making explicit the intersection of scale and proportion, sight and view, touch and reach that is rendered visible in the vertical dimension (as opposed to from top down). In a section, the interior elevations of walls and surfaces are revealed, combining—for examination and exploration—structure and ornament, envelope and interior.
Plans and sections are similar representational conventions and offer an important point of comparison. Both depict a relationship that is not directly perceivable by the human eye, between a building’s mass and the space. Both describe cuts—the one horizontal, the other vertical. The horizontal division of a plan cuts primarily through walls, not floors. Sections, on the other hand, are capable of showing cuts through both walls and floors and organize space in alignment with the size and scale of the standing human figure. Plans are typically argued to be the locus of design agency, with sections understood as a means to manifest the effects of the plan through structure and enclosure. In comparison to plan types, which are distinguished by their spatial consequences, section types are usually identified by the scale of their cut: site sections, building sections, wall sections, detail sections. Wall and detail sections foreground technical concerns, using graphic conventions of line, hatch, and tone, and depict material systems and tectonics. Site sections emphasize a built form’s massing and its relationship with its environment and decrease the role of internal space. But it is in the building section that a number of crucial issues are at play, including the formal, social, organizational, political, spatial, structural, thermal, and technical.
CONTEMPORARY DISCOURSE ON SECTION
The section is not limited to its status as a representational technique. Today sections are used expansively to illustrate, test, and explore architectural designs. The section illuminates the interplay between a building’s structure and the space framed between foundation and roof. Gravitational loads of structure trace vertically down through a building, with wind loads registering laterally against the side of a building’s section. The material investment and spatial invention necessary to creatively resist these loads is best explored and depicted through the architectural section.
As questions of energy and ecology have become increasingly important to architectural design, the section will take on a more prominent role. Thermal forces work in section. Cold air is heavier and settles, while hot air rises. The sun rises and falls against the horizon. The vertical calibration of space is essential for inventing and creating architecture to engage environmental performance. Architects need to calibrate overhangs and apertures to produce the optimal solar radiation; interiors should be configured to maximize convection-driven air movement; roof pitches need to be set to ensure the efficiency of solar panels; wall thickness must be dictated by insulation calculations; and so on. Often driven by a desire to meet sustainable certification criteria, architects and engineers use section drawings to illustrate adherence to conventions of thermal performance, with arrays of arrows illustrating thermodynamic forces. This emphasis on thermal efficiency foregrounds the opportunities of the section, but paradoxically constrains the spatial and experiential potential of the section by aligning sectional innovation to only functional obligations.
Yet, despite the importance of section as a drawing type and as a key method for optimizing spatial qualities, structural design, and thermal performance, there is a relative paucity of critical writings or discourse on section. A well-established body of writing exists on the history and impact of the plan, but there is no single book on the history, development, and use of the section within the practice of architecture. Only a few essays on section have been published, with the two most often cited written more than twenty-five years ago: Wolfgang Lotz’s The Rendering of the Interior in Architectural Drawings of the Renaissance
¹ and Jacques Guillerme and Hélène Vérin’s The Archaeology of Section.
² Interestingly, both essays have parallel motives beyond cultivating and describing the architectural section itself.
This lack of direct attention may very well come from the ambiguous position that section occupies. It is often understood as a reductive drawing type, produced at the end of the design process to depict structural and material conditions in service of the construction contract, rather than as a means for the investigation of architectural form. While we are interested in the representational conditions of section, we argue that thinking and designing through section requires the building of a discourse about section, recognizing it as a site for invention.
Revealing Cuts
Ottavio Bertotti Scamozzi after Andrea Palladio, Teatro Olimpico, 1796
Thomas Ustick Walter, US Capitol Dome, 1859
Le Corbusier, Unité d’Habitation, 1952
Affonso Eduardo Reidy, Museum for Modern Art, 1967
Thermal Sections
Candilis Josic Woods, Shading Diagram, 1968
Foster + Partners, Commerzbank Headquarters, 1997
Bucholz McEvoy Architects, Limerick County Council, 2003
HEURISTIC STRUCTURE FOR SECTIONS
The initial challenge in creating meaningful and accessible discussions of the section is the absence of a language that would provide a shared frame of reference. To address this void, we have devised a category system based on seven distinct section types: Extrusion, Stack, Shear, Shape, Hole, Incline, and Nest. The vast majority of sectional relationships can be described by one of these categories or several in combination. These types are intentionally reductive in order to make recognition simple; they are rarely found in pure form. Indeed, upon close inspection, no project perfectly demonstrates only one type of section, as all tend to have aspects of two or more. But where a dominant type of section prevails, that designation is given.
Our purpose is not to present these types as a new kind of Platonic ideal to be pursued in isolation. The fact that a building’s section may exemplify one of these types does not automatically denote a particular significance or meaning. Rather, respectful of the potential of architecture, we provide these types as a heuristic frame for building a discourse about section at the intersection of material, cultural, and natural systems. Our objective is to learn more about the ways in which section types or combinations of types might be used and how this understanding could serve the discipline of architecture. As we argue, each type of section lends itself to distinct capacities, from the cultivation of a shared sense of space to the facilitation of thermal performance, from the establishment of spatial hierarchies to the enhancement of the interplay of exterior and interior.
The following terms and definitions will be explained in the subsequent essay in greater detail:
Extrusion: the direct extrusion of a plan to a height sufficient for the intended use
Stack: the layering of floors directly on top of one another—an extruded section, repeated with or without variations
Shape: the deformation of one or more of the primary horizontal surfaces of a building to sculpt space
Shear: the use of a rift or cut along either the horizontal or vertical axis of a building to generate sectional difference
Hole: the deployment of any number or scale of penetrations through a slab, exchanging lost floor area for benefits in section
Incline: the manipulation of the angle of an occupiable horizontal plane, which tilts the plan into section
Nest: the creation of sectional consequences through an interplay or overlap of legible volumes
Sixty-three one-point-perspective section drawings of built projects form the central portion of this book. We selected these projects because they represent a range of approaches to section, forming a body of work useful for further study, development, and inquiry. Certain projects illustrate one of the section types in a clear and demonstrative way. Other projects exhibit complex and creative approaches to section, often incorporating two or more types in a wide range of new formations that transcend the limits of a particular type in isolation.
All projects date from the turn of the twentieth century or later, a time frame chosen because of its historical alignment with the proliferation of standardized and industrialized methods of building. These methods typically have given rise to repetitive stacked sections, placing a new imperative on the section as a site of investigation and invention. We included only projects that have been built, to ensure