Since 2005, Ventotech has performed practical tests in attics at the SP Technical Research Institute of Sweden, as well as in several other locations around Sweden. These have verified the technical performance of the system and have validated the computer simulations and modelling, which were undertaken in collaboration with Chalmers University of Technology in Gothenburg. Click on the diagrams on the right to read more.

Master's thesis: Moisture in cold pitched roofs - a mapping survey of single-family houses in Västra Götaland County, Sweden

Ventilated cold pitched roofs represent a building construction technique that has been used in Sweden for hundreds of years. Today, 1 300 000 out of 2 million houses are estimated to have this type of roof. Statistics have revealed that at least 50 % of Sweden’s cold pitched roofs are in the risk zone to develop, or already have developed, moisture problems. This thesis presents results from a mapping survey of cold pitched roofs. It concludes that 72% of the cold ventilated attics have extensive mould growth. This is due to changed building conditions such as increased insulation thickness in the attic floor, heating systems without combustion and increased moisture production in the dwelling area. Cold pitched roofs are considered a risk construction from a moisture perspective. A report (in Swedish only) can be downloaded here.

Controlled attic ventilation

Research, regarding sealed attic construction in combination with CCC, has been carried out in collaboration with Chalmers University of Technology and major construction companies, which include NCC and Skanska. The research focuses on moisture levels, construction costs and energy consumption. It is financed by SBUF, the Swedish construction industry's organisation for research and development, which has approximately 3,000 affiliated companies. Read more here (in Swedish).