Davies, M; Mumovic, D; Ridley, I; Oreszczyn, T; (2005) The reduction in air infiltration in dwellings due to window replacement. In: Yang, X and Zhao, B and Zhao, R, (eds.) INDOOR AIR 2005: PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON INDOOR AIR QUALITY AND CLIMATE, VOLS 1-5. (pp. 3302 - 3306). TSINGHUA UNIVERSITY PRESS

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Abstract

In the UK, existing dwellings have been traditionally considered as 'leaky' with unnecessary air infiltration resulting in excessive energy use. However, when 'old' windows are replaced, it is likely that the new windows will have a lower air permeability. If most, or all, of the windows in a property are replaced, then the overall reduction in the infiltration rate may be significant. If a dwelling already has a low infiltration rate, then the reduction which will occur upon replacement of the windows may result in an unacceptably low air change rate. Currently, the widely recommended minimum air change rate is 0.5 ach(-1). This study set out to investigate if window replacement is likely to reduce infiltration rates to below this level in a significant number of dwellings in the UK. A sample of dwellings was thus pressure tested before and after window replacement and the change in the air infiltration rate determined. If the results are taken as being representative of the UK building stock then the data suggests that approximately 65% of dwellings in the UK could have a predicted heating season mean infiltration rate below 0.5 ach(-1) after the installation of new windows.

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