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Experimental setup
Results up to 2016
Results up to 2023
Interview with builders
The hygrothermal behaviour was not yet known at the beginning of the product development of Fixit 222 Aerogel high-performance insulating plaster, so a renovation with long-term monitoring and corresponding sensors was carried out on a selected test property in Winterthur, Switzerland. The first measurement phase ran from 2012 to 2016.
After the 10th anniversary of the insulating plaster being applied, we wanted to know exactly how it was doing so we reactivated the sensors in the façade in April 2023 and carried out further measurements – and the data is impressive!
The sensors (one sensor is visible to the left of the window) are installed on the previously exposed brickwork of the external façade.
The plaster application of the Aerogel insulating plaster with reinforcement layer was carried out above the sensors.
The finishing plaster with the coarse grain structure has been applied. The final coat of paint is still missing to complete the new exterior façade.
After the plastering work was completed in August 2012, the plaster dried evenly and quickly. By November 2012, the relative humidity below the insulating plaster on the masonry was already below 80 per cent.
At the end of 2013, the energy-efficiently renovated façade reached the steady state of the insulating render, as the relative humidity on the masonry was stable at between 50 and 60 percent from this point onwards.
The temperature differences between the cold outside air and the masonry under the insulating plaster measured over the test period of four years averaged between 6 °C and 8 °C in the winter months.
The temperature did not fall below the dew point in the steady state. Underneath the Fixit 222 Aerogel high-performance insulating plaster, the masonry therefore remained warm and dry at all times measured.
In March 2023, after more than 10 years of Fixit 222 Aerogel high-performance insulating plaster, the building physics measurements and tests were carried out again by IABP Bauphysik AG and the sensors on the south-east façade were reactivated for four weeks. Unfortunately, the sensors on the north-west façade could no longer be activated. Further inspections of the exterior façade for damage or problem areas were also carried out. The measured values and the overall impression of the energy-efficiently renovated exterior façade are convincing facts and confirm the high quality and functionality of the innovative high-performance insulating plaster.
The relative humidity directly on the masonry averaged 40 per cent during the measurement period. This confirms the measurement results from 2012–2016. From a building-physics perspective, this situation and the insulating plaster are perfect for the masonry: the conditions are constantly dry and warm.
The temperature under the insulating plaster directly on the masonry averaged 16 °C during the measurement period and was therefore around 8 °C to 10 °C higher than the outside temperature.
In order to visually check the insulation effect, images of the exterior façade were taken with an infrared camera. As this is a mid-terrace house, you can see a clear difference compared to the neighbouring houses without energy-efficient renovation.
The heat loss of the energy-efficient renovation of the building is significantly lower and the façade has a much lower surface temperature than the neighbouring buildings – these shine in red, whereas the building plastered with Fixit 222 Aerogel high-performance insulating plaster is shown in yellow-light green.
During the quality inspection of the exterior façade, the surface was checked for defects or damage and the overall condition was assessed. The plaster on the sunny south-east side is in impeccable condition – the trowel cast and the mineral surface coating show no cavities or flaking. The north-west side is also in very good condition – although this façade is almost always completely shaded and more exposed to weathering and spray water, there is no recognisable damage to the plaster.
The unique properties of Fixit 222 Aerogel high-performance insulating plaster continue to impress even after more than ten years – both visually and with the measured values for building physics. This speaks in favour of the impeccable quality of the insulating plaster with Aerogel. To conclude the investigation measures, we conducted an interview with Mr and Ms Bretscher, the owners of the energy-efficiently renovated building.
We were not allowed to apply more than 6 cm of insulation to the two neighbouring terraced houses. With this low layer thickness, the insulation value of the Aerogel insulating plaster was expected to be significantly better than that of another conventional insulating plaster. This investment in better insulation was worth the additional costs of around CHF 10,000 forecast by the architect. In the final invoice, the additional costs were even much lower than assumed.
Yes, because our indoor climate is very good. The condition of the façade is also impeccable, despite the heavy trowel-cast rendering and the weathering – especially on the north-west side.
Yes, of course, we've already done that.
We are proud that our product innovation Fixit 222 Aerogel high-performance insulating plaster continues to impress with its top functionality even after more than ten years and also looks perfect visually. The measured values and test results confirm that the high-performance insulating plaster is the right choice for the energy-efficient renovation of protected buildings.
Thanks to the outstanding Lambda value of the high-performance insulating plaster, an effective insulating effect is created even at low insulation thicknesses of three to four centimetres and the building's energy consumption is reduced. At the same time, the visual appearance of the exterior façade can be preserved, thereby fulfilling the requirements of monument, heritage and townscape protection. Fixit 222 Aerogel can also be used for organic geometries such as curves or arches – regardless of whether the product is to be used indoors or outdoors.
To the product Fixit 222 Aerogel
The innovative Fixit 222 Aerogel high-performance insulating plaster has been in use for more than a decade. In 2013, the quality and durability of the product was monitored and tested in parallel in a long-term test. Find out more!
Extremely effective insulating material, as excellent insulation values are achieved with just 4 to 6 centimetres of the light and airy insulating plaster. This makes the render perfect for the energy-efficient renovation of historic buildings.