3D Module made out of kerto and timber frame structure

Key benefit

Off site building method

Material list

Kerto S for portal frame for wall and ceiling
OSB panels
Solid wood for the floor and wall

Ecological values



  • Economical span (mm) 4
  • Thickness (mm)
  • Airbourne sound reduction factor (dB)
  • Impact sound transmission (dB)
  • Resistance to fire class 60 R
  • Thermal properties



  • The construction of the portal frame offers at the end of the module a beautiful large window area, through which plenty of natural light enters the living space. In the further development and more detailed static analysis, it might be possible to achieve a material optimization via larger center distances of the portal frame.
  • This design idea is very well thought out and could easily be developed a lot further. With the portal half frame, it is in itself stable and does not rely on racking walls at the end of the module, allowing for large openings at both ends of the module. The rigid connection will give enough stability for lifting the module, too. With a lintel spanning from one end to the other, the module could be designed for a large space between two modules sitting on top of existing buildings.
  • The idea is an inspiring starting point. It looks material consuming, but there are path for optimization. More spaces could be left between portal frames (eg 2,4 to 3 m). perhaps with a transverse lintel as long as the module would be. Combining modules in front of each other readily creates large living rooms (up to ~7m), depending on transport possibilities. The key is the connection of portal frame post and rafter. A glued connection should for example be developped and certified, in order to bring strength and stiffness to the frame. For sure development is to be pursued!


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