There are still a large number of older windows that are worthy of preservation in Norway. It is beneficial to upgrade solutions with respect to the U-value, sound insulation and other properties. SINTEF Building & Infrastructure has carried out a project related to this where we have seen what can be achieved by installing a secondary casement in addition to the existing window. Optimization of double glazing in the secondary casement has been done with respect to U-value, but in this project we have also measured sound insulation properties. These measurements also include the effect of different sealing solutions. We have also carried out calculations of the sound reduction index. The paper will present results from this project with comparison of measured and calculated sound insulation properties. It is possible to achieve high sound insulation of windows with a secondary casement. But the project also shows that the sealing between the sash and frame is very decisive for the sound insulation result.
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