Vapour Diffusion

Vapour diffusion may damage the beam ends of  timber beamed ceilings. Hence consideration of the temperature distribution between empty and occupied building floors.

Preliminary Timber-Concrete Assessment

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Static calculations software

Professional-Software for the dimensioning of TCC load bearing structures

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Timber-Concrete Composite Fibula

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TCC Norms

In addition to EC 5 »Design and construction of timber structures«, the HBV shall be standardised. In preparation for this, several research institutions in Europe are currently working on a technical specification.

Properties of TCC

  • Large load spans
  • low dead weight
  • good fire resistance
  • good sound insulation
  • low susceptibility to vibration
  • prefabrication possible

Cooperative investigations facilitate the control of damage to timbers by humidity

In the case of occupied dwellings, vapour diffusion is without problems, provided the temperature is similar on both sides of the supporting structure. However, the situation changes in dwellings below roofs that  are not insulated roof structures or located above building cellars. Verification pursuant to DIN 4108-4 is essential here. Furthermore, a three-dimensional representation of the interactions between the fabric constituents may be needed.

We have access to the technological services of the German  Institut für Bauklimatik of Dresden Technical University for this purpose. When installing internal insulation systems in buildings with older timber-beamed ceilings, the beam ends specifically act as heat transfer and diffusion bridges. Contrary to the former prevailing opinion that everything in a building needs to be rendered vapour-tight, it is now accepted that superstructures that are open to diffusion are a much better solution. Because of the large number of factors of influence, every building needs to be considered as a separate object.