High school Colbert de Lorient - Buildings B and C

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Educational buildings dating from 1959. A thermal renovation was undertaken by implementing a prefabricated wooden panel frame for external insulation. The insulation, rainscreen, joinery and part of the external coating were assembled before the installation of a wooden panel frame. Interior mechanical ventilation was also installed.

Important notes and achievements of the project:

  • Reform intervention in an occupied high school. Construction with loud work (high sound level) was concentrated during school holidays
  • Rapid execution: 6000 m² of floor area renovated in 10 months
  • Air permeability of the building has been lowered (divided by three)
  • Heat demand of the building has been lowered (divided by three)
  • Summer discomfort reduced
  • Improvement of visual and acoustic comfort.


The project owner is the Brittany Region, which has set up an Eco-repository/building system (Eco-référentiel des Lycées) for schools which gives a general framework of sustainable development.

In this particular project the objectives were:

  • the reduction of buildings' energy needs (class B and - 40% of primary energy consumption)
  • indoor air quality (low emission paintings and installation of mechanical ventilation )
  • reducing the carbon footprint through the use of wood



Original source Construction21 (C21)

Lessons learnt

n/a at present time

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