Updated on September 26, 2023

·

Created on October 21, 2020

Oga'i House

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Incremental housing solution for Mbya Guarani communities in Caaguazu, Paraguay.

Developed By Unknown
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Author

Product Description

The Oga’i House is a housing typology developed by CEDES/Habitat for and with the participation of the Mby’a Guarani indigenous communities living in the region of Caaguazu, Paraguay. The design of the Oga’i House follows the construction principles and cultural costumes of the traditional houses of the Mby’a Guarani community. The project also incorporates alternative building materials to replace or decrease the use of depleted resources such as wood.

Due to the remote location of these communities and difficult access to infrastructure, designers implemented passive design strategies and mechanisms such as low-tech interior airflow strategies, construction of new kitchen stoves to reduce the impact of smoke in the interior, hybrid roofing techniques combining standard and local materials to avoid Chagas disease spread, and external solar sanitary and shower system.

The Oga’i House initiative was co-designed between CEDES/Habitat and the Asociación Mborayhu Porã – Mbya Guarani, co-financed by the Ministry of Urbanism, Housing and Habitat of Paraguay through a social housing grant subsidy and benefited communities, assisted by the Architecture, Design, and Arts School at the National University of Asuncion, and executed by the construction company Altec S.A.

Market Suggested Retail Price

$10,500.00

Distributors / Implementing Organizations

This product has been implemented by CEDES/Habitat through the Ministry of Urbanism, Housing and Habitat of Paraguay.

Manufacturing/Building Method

The design process of the Oga'i House typology included the participation of the Mbya Guarani community members through design charrette sessions and prototyping. Building methods included off-site and on-site processes. Posts, rafters, and beams made of reinforced concrete were prefabricated off-site and transported to the site for assembly. Building materials such as bricks, cement, and corrugated galvanized sheets were sourced by suppliers from the region of Caaguazu and transported to the site for assembly. Teams of masons worked on-site for foundation and walls construction as well as roof assembly. Locally-sourced materials included straw for roof insulation, fibrous materials for basketry work used for upper wall enclosures, and soil for rammed earth floors.

Intellectural Property Type

Trademarked

User Provision Model

This product is distributed by CEDES/Habitat to Mbya Guarani families living in Caaguazu, Paraguay, through the Ministry of Urbanism, Housing, and Habitat of Paraguay.

Distributions to Date Status

By 2020, 2,904 units have been distributed to the Ministry of Urbanism, Housing and Habitat of Paraguay.

Unique Design (Yes/No)

Yes

Intended number of occupants (#)

5

Duration of construction (days)

Unknown

Footprint area (m²)

?40 m²

Number of storeys

1

Material composition

Posts, rafters, and beams made of prefabricated reinforced concrete, masonry walls, rammed earth foundations for masonry walls, interior floors made of bricks and intermediate space floor made of rammed earth, windows and doors made of wood, and upper wall enclosure made of basketry work from locally source materials. The roof consist of corrugated galvanized sheets covered with with a layer of thatched roof.

Flammable flash point temperature (ºC)

Different materials present different flammable flash point temperature. Reinforced concrete components resistance to fire vary depending of the aggregated materials used and its protection layer thickness. According to researchers at ASCE, the strength of concrete containing siliceous aggregate begins dropping at ?400 ºF. Bricks used for masonry walls are non-combustible; therefore, fire resistance vary between 1-4 hours depending of the aggregated used for the fabrication of the brick and thickness of the walls.

Thermal insulating capacity (m²*K/W)

R-Value of common brick of 100 mm thick is 0.14 m²*K/W. R-Value of concrete varies depending of the composition and thickness between 0.14-1.35 m²*K/W. R-Value of a thatched roof of ?30 cm thick is 0.50 m²*K/W.

Maximum wind speed (km/h)

Unknown

Structural Occupancy Category

II

Seismic Design Category

A

Suitable Climates

Tropical

Design Specifications

The Oga'i House developed by CEDES/Habitat in cooperation with Asociación Mborayhu Porã - Mbya Guarani sought to answer the need for housing based on the culture and costumes of the Mbya Guarani community living in Caaguazu, Paraguay. The five-member family house unit is 40 m² and composed of three main spaces based on the traditional Mbya Guarani houses: a) "Tataypy" or cooking room; b) "Oga guy" or semi-covered space for social activities; c) "Keaty" or sleeping room. The building system is made of off-site and on-site construction methods. The main structure is made of prefabricated forked columns, rafters, and beams. The structure recreates the traditional forked wood structure built by the Mbya Guarani and replaces wood which is a very scarce material in the region today. The double roof system is composed of corrugated galvanized panels covered with a thatched roof. The use of galvanized panels protects families from potential contact with Chagas disease and the thatched roof layer works as the roof insulation layer.

Technical Support

Provided by the CEDES/Habitat

Replacement Components

Most of the components of the house were thought to be durable and low-maintenance due to the remote location of houses and difficult access to material suppliers. Foundation, walls, and roof are made of long-standing materials except for the layer of thatched roof used to cover the corrugated galvanized panels. This layer of the thatched roof can be replaced with local materials. Upper wall enclosures made of natural fibers can also be replaced with local materials.

Lifecycle

Unknown

Manufacturer Specified Performance Parameters

Designer specified performance targets include:

  • Off-site prefabrication of concrete components for the main structure to avoid using wood
  • On-site assembly of concrete structure
  • On-site walls construction
  • Space organization based Mbya Guarani culture to impulse households appropriation
  • Implementation of locally source materials for the foundation to avoid transporting materials from far away places
  • Intermediate space area to facilitate social activities
  • Upper wall enclosures to increase cross-circulation of natural ventilation
  • Increment thermal insulation of roof implement a combine thatched and corrugated galvanized metal panel roof
  • Decrease fire risk by placing the thatched roof over the corrugated galvanized roof panel

Vetted Performance Status

Observation performed by researchers from the University of Seville (Spain) reported confident results related to community participation in the design and construction process, reforestation in the area surrounding the houses (families benefited with a house paid part of the cost of the house through reforestation), improvement of comfort conditions in the interior of the house, implementation of a garden for family consumption, and cases of return of families members that migrated to urban areas.

Safety

No known safety hazards are related to this product.

Complementary Technical Systems

The Oga'i House included the construction of a Solar Dry Toilet unit in the exterior of the house.

Academic Research and References

Prieto Peinado, M., and Gutierrez Mora, M., 2016. Observatorio Proyecto Oga’i. Evaluación Del Impacto Producido Por El Proyecto Oga’i En Las Comunidades Mbya-Guaraní. Habitabilidad y Entorno, Colleccion Investigaciones IdPA_02_2016, 297–312.

Prieto Peinado, M., Redelas Sanchez, T., Aguilar Ruiz, I., 2018, Estrategias Para El Reconocimiento de Costumbres y Hábitos a Través de La Lectura Del Territorio Mbya Guaraní En Las Comunidades Del Guaira, In Colleccion Investigaciones IdPA_04_2018, 141–61.

Prieto Peinado, M., Rios Cabrera, S., and Gill Nessi, E., 2017, El Oga’i de Los Mbya Guaraní de Caaguazu, Colleccion Investigaciones IdPA_03_2017, 245–61.

Rios Cabrera, S., 2013, Arquitecturas Tradicionales En El Paraguay, Arquitectura Vernacula Iberoamericana, G. Maria Viñuales, ed., Sevilla, 82–101

Rios Cabrera, S., and Gill Nessi, E., 2014, The Oga’i of the Mbya Guaraní People in Paraguay: Alternatives for Indigenous Habitat, Vernacular Heritage and Earthen Architecture: Contributions for Sustainable Development. M. Correia, G. Carlos, and S. Rocha, eds., Taylor & Francis Group, London, pp. 35-40

Compliance with regulations

The Oga'i House is certified by the Ministry of Urbanism, Housing, and Habitat of Paraguay.

Other Information

The designer developed a version of the Oga'i house but for another Native community in a different region. They stated they are working on a new version of the Oga'i House. Interview with designer

Comments from the Community

1 Comment

  1. jitansh says:

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