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Laboratory for Thermal Building Physics

The laboratory for thermal building physics is a partner and service provider for the determination of thermally relevant parameters in the construction sector, such as the U-value, g-value or λ-value. Our clients include manufacturers and licencers of a wide range of building elements and materials. We also support engineering firms, planners and building experts in determining thermal and energy parameters for property-specific thermal insulation certificates.

In the field of computer-aided simulation , thermal parameters are determined on the basis of FEM simulations. Only suitable or regularly validated calculation programmes are used here.

The laboratory is equipped with standard-compliant testing equipment for metrological testing services . These include, in particular, the hot box and the guarded hot plate. These are supplemented by spectrometers and integrating spheres in the light laboratory and various climate test rigs in the climate laboratory.

Within the scope of flexible accreditation , tests with no normative basis can also be carried out. These include, for example, the calorimetric determination of the total energy transmittance (g-value) of glazing/shading and the testing of the condensation behavior of single or multi-layer construction elements.

Two test engineers stand in front of a hot box test rig for climate tests
The hot box method is used to determine the thermal transmittance (U-value) of building elements

Services of the Laboratory for Thermal Building Physics

  • U-value / R-value: Measurement / FEM simulation
  • Psi value: FEM simulation
  • λ-value: Measurement
  • g-value: Measurement
  • fRsi value and isothermal line: FEM simulation
  • Condensation test: Measurement
  • Passive house suitability: Measurement / FEM simulation
  • Proof of equivalence DIN 4108 Supplement 2: FEM simulation
 MeasurementCalculation
U-value (thermal transmittance)EN 12412, EN ISO 12567EN ISO 10077-1, EN ISO 10077-2, EN ISO 6946, EN ISO 12631
Psi value (linear thermal transmittance) EN ISO 10077-2, EN ISO 10211
λ value (thermal conductivity)EN 12664, EN 12667, EN 12939, EN 674 
fRsi value (temperature factor) EN ISO 13788
Further standards: EN ISO 10456, DIN 4108

All Advantages at a Glance

Expertise and many years of experience of our team of engineers, technicians and building physicists

You receive all relevant thermal parameters for the construction sector from a single source

Our involvement in national and international standardization committees ensures that the tests we carry out are always up to date.

A project engineer is available to you as a personal contact during the test

Weather-independent tests in our test halls. The test specimens are assembled by our laboratory staff

Individual, goal orientated and efficient test sequences and intelligent specimen selection

Our accreditation ensures the use of standard-compliant and calibrated test equipment and validated software

Development and realisation of special projects within the framework of flexible accreditation

Products in Detail

The following products are tested in this laboratory:

  • Windows, doors, gates, curtain walls
  • Profile bars
  • Spacers
  • Insulating materials
  • Rooflights, roof windows
  • Insulating glass units, vacuum insulated glasses
  • Roller shutters and closures
  • Panels
  • Wall connections
  • Wall systems
  • Light control and shading systems

Our test benches

Two test engineers stand in front of a hot box test rig for climate tests
The hot box method is used to determine the thermal transmittance (U-value) of building elements
An test engineer lifts a specimen from a guarded hot plate
The thermal conductivity (lambda value) of materials and the thermal transmittance (U-value) of plate-shaped test specimens are determined in the guarded hot plate
A test engineer in a sun-protective suit stands in front of an illuminated Calimero test rig
Calorimetric determination ("Kalimero") is used to determine the total solar energy transmittance (g-value)

Laboratory for Thermal Building Physics

Theodor-Gietl-Str. 7-9

83026 Rosenheim

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