Technical specifications
Dimensions
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Interior floor area: 30.15 m²
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Exterior footprint: 47.17 m²
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Outside diameter: 7.65 m
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Inside floor diameter: 6.53 m
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Outside height: 4.64 m
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Inside height: 4.55 m
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Interior air volume: 118 m³
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Total structure weight: approx. 1 179 kg
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8 Base Pods forming a 16-sided perimeter
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8 doors and 8 jamb panels
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Doors: 0.9 m wide × 2.1 m high
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Optional screened windows (500 mm × 450 mm)
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SANS 10400-A:2010
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Structural certification by Delf Civil and Structural specialists
Materials
Our uBoma components are roto-moulded type 1 UV-stabilised high-density polyethylene (HDPE), which can last for 20 to 45 years, depending on conditions. At the end of use, they will be collected and reintroduced into the uBoma production process as part of our 30% to 50% recycled plastic content.
Our base flange and pole hardware are made of powder-coated hot rolled steel. All other fittings are made of stainless steel.
Air volume and ventilation
uBomas have an interior air volume of 118 m³, with 12 roof sleeve bores enabling natural convection airflow.
Optional inline DC bore fans can evacuate and replace the full air volume in minutes. While optional windows provide for cross ventilation and abundant fresh air exchange.
Solar power
Each uBoma roof can collect at least 7kWh a day, using sixteen 1m² north-facing panels that are designed to work well in combination. Power is then stored using modular and expandable Peco Power PowerBricks™.
These can be combined with Peco InverterBricks for use of both DC and AC appliances and devices. Additional configurations are available that allow for up to 11kWh to be collected daily.
Rainwater harvesting
Each uBoma roof collects 70.4 litres of water per 1 mm of rain.
Its 16 roof panels feed into an integrated perimeter gutter system. The gutters are connected manifold allowing distribution around the entire perimeter, inside and out.
Water collection can be routed to common low profile ground cisterns located as needed, and moved to elevated cisterns using DC pumps.
Grey water handling
Grey water, i.e. water from showers and basins, can be collected for reuse – using either small scale systems that filter water for local irrigation or larger scale projects that use grey water treatment units to recapture and reuse water from shower stalls for toilet flushing and irrigation.
Waste to Watts
Waste can be collected from toilet stalls directly into a pasturisation hopper and bio-digestion tank array to create biogas.
This can be used to generate power to supply hot water, cookhouse fuel and heating the pasturisation hopper. Biogas can also be bottled for community distribution.
Assembly
Our uBomas consist of flat-packed modular components that are organised to follow the assembly sequence, ensuring they are quick and easy to erect. Minimum site preparation is required, with the base pods forming the ballast foundation.