Origin / Location of manufacturing / Processing plant
Application and typical uses of the product
Domestic dwellings/commercial buildings.
Breakdown of Product
Structural component (50% by volume): Clay based subsoil from Normandy, France (FR2,4,6) with 2.5% (by weight of dry soil) of added mixed fibre (hemp straw, chopped reed, wheat straw).
Thermal component (50% by volume):
Clay based subsoil slip from Normandy, France (FR3) with 50% (by weight of dry soil) of added hemp shiv.
Thermal conductivity (k) W/m°C or Thermal transmittance (U-value) - W/m2°C (If applicable)
Target thermal conductivity of < 0.3 W/(mK)
Is the resource Renewable or Finite?
Does the material need to be processed further or treated by the user
Structural cob component: Addition of fibre material. Thermal cob component (light earth): Addition of fibre material to a clay rich ‘slip’.
Buildability - how complex is installation? What skill level is required?
Not complex. Minimal skill following training.
Deconstruction and Re-use
Fully reusable or returned to natural state.
Disposal/ End of Life
Returned to natural state (on site subsoil). Fibre material biodegradable.
Types, textures, specifications and colours currently available
Dependent on original subsoil colour/texture.
Is this product certified?
Designed to comply with current UK and French building regulation on thermal conductivity.
Lifespan of materials if maintained correctly (years)
Decades to potentially several hundred years.
Availability - how easy is it to source the material
Readily available in clay subsoil areas.
CobBauge (Interreg VA research project), University of Plymouth, Faculty of Arts and Humanities, School of Art, Design and Architecture.
Matthew Fox, Kevin Owen
School of Art, Design and Architecture Faculty of Arts and Humanities, University of Plymouth, Drake Circus, Plymouth PL4 8AA UK