This European Standard specifies the test methods for evaluating:- the risks of decay of openable and fixed windows manufactured of different materials through increased moisture accumulation as a result of condensation or water vapour diffusion;- the influence of deformation on basic performances of openable and fixed windows manufactured of different materials exposed to different climates between their external and internal faces.Three test methods are to be differentiated. They take into account different cases of loadings.- Test method 1: For designs with low resistance to water vapour diffusion (normally designs with water vapour equalization holes);