Traité de construction en terre (3rd ed.)

About this book

Few publications have done more to systematize humanity's oldest building material than the Traité de construction en terre, the encyclopedic treatise on earthen construction produced by CRAterre — the International Centre on Earthen Architecture — and authored principally by Hugo Houben and Hubert Guillaud. First released in 1989 and subsequently revised and expanded, this third edition published by Parenthèses represents decades of accumulated research, fieldwork, and technical refinement generated at CRAterre's laboratory within the National School of Architecture in Grenoble, France. It stands as the most comprehensive single-volume reference on the subject in any language.

Houben, a physicist-engineer who has devoted his career since the early 1970s to developing affordable and environmentally sound housing in the developing world, brings a rigorous scientific lens to material behavior, soil mechanics, and construction physics. Guillaud, an architect and co-director at CRAterre, contributes deep experience in heritage documentation and design methodology. Together they chart a course through the full spectrum of earthen construction: from the geological and mineralogical composition of raw soils to the structural performance of finished walls, from vernacular traditions across six continents to contemporary engineered applications.

The treatise organizes its knowledge around a celebrated taxonomy of earthen construction techniques. Readers are guided through the principal approaches that define the field: pisé (rammed earth), in which damp soil is compacted in layers within temporary formwork to produce dense, monolithic walls; adobe, the ancient practice of molding sun-dried mud bricks from a mixture of clay, sand, silt, and fiber; compressed earth blocks (CEB), produced mechanically or manually to achieve higher compressive strengths and dimensional uniformity than conventional adobe; wattle and daub, a woven lattice of branches or canes coated with a clay-rich plaster; cob, a hand-sculpted mixture of clay, straw, and aggregate applied in successive courses without formwork; and several additional techniques including bauge, earthen plasters, pressed panel systems, and hybrid assemblies that blend earth with other materials. This systematic mapping of techniques allows practitioners to select the method best suited to available soils, labor skills, climate, and structural requirements.

A substantial portion of the treatise addresses the material science underpinning earthen construction. Soils are not uniform; their suitability for building depends on the balance of clay, silt, sand, and gravel fractions, on mineral plasticity, on moisture-retention characteristics, and on compressive and shear strength under load. The authors provide clear protocols for field identification tests — the ribbon test, the sedimentation test, and the ball drop test — as well as laboratory procedures for granulometric analysis and Atterberg limit determination.

These tools allow designers and builders to assess and modify soils through stabilization with lime, cement, pozzolans, or natural binders, or through the addition of fibers and aggregates, achieving performance targets previously thought unattainable with unprocessed earth. Structural design receives rigorous treatment. The book addresses the load-bearing capacity of rammed earth and adobe walls, the dimensioning of openings and lintels, horizontal tie-beam systems, foundation conditions, earthquake-resistant detailing, and the integration of earthen walls with roof structures and floor diaphragms.

The authors are candid about the limitations of earth as a structural material — particularly its vulnerability to erosion from rain splash and capillary rise — and propose proven remedies: adequate roof overhangs, plinths of durable materials, lime or cement renders, and bituminous damp-proof courses. Beyond techniques and structural performance, the treatise explores the climatic and environmental virtues of earth construction. Thick earthen walls possess excellent thermal mass, absorbing heat during the day and releasing it slowly at night, thereby stabilizing interior temperatures in both hot-arid and cold-temperate climates.

Earth is a hygroscopic material, buffering indoor humidity by absorbing and releasing moisture vapor, which contributes to healthy indoor air quality. The embodied energy of raw earth is among the lowest of any structural material: no kiln firing, no high-temperature processing, and minimal transportation energy when soils are sourced locally. At end of life, unstabilized earth walls can be returned to the ground without toxic residue.

The treatise also surveys built precedents from around the world, presenting earthen buildings ranging from the magnificent multi-story tower houses of Yemen's Hadhramaut valley and the Kasbahs of Morocco to contemporary civic and residential buildings in France, Australia, and the Americas. This historical and geographic breadth reinforces the argument that earthen construction is not a primitive fallback but a sophisticated, adaptable, and enduring building tradition with urgent relevance for sustainable development. As a reference tool, the Traité de construction en terre is organized for multiple audiences: policymakers and development agencies assessing the potential of earthen construction for mass housing; engineers and architects designing contemporary earthen structures; builders and craftspeople seeking technical guidance; and researchers investigating material properties and performance benchmarks.

Its visual documentation — drawings, photographs, test diagrams, construction sequences — makes complex concepts accessible without sacrificing technical depth. More than three decades after its first publication, the book remains the foundational text in its field. Its combination of material science rigor, constructive breadth, and environmental advocacy has shaped earthen architecture education and practice on every continent, and it continues to inform the growing contemporary movement toward low-carbon, bio-based, and vernacular-inspired building cultures.