DD ENV 13420:2000

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
      3.1 Designs with low resistance to water vapour
             diffusion
      3.2 Designs with high resistance to water vapour
             diffusion
      3.3 Designs being sensitive to deformation
      3.4 Windows manufactured of different materials
      3.5 Orientation
      3.6 Wet spot
4 Principle of test
5 Test facility
6 Dimensions of the test specimens
7 Preparation for test
8 Test conditions
9 Test methods
10 Test sequence
11 Test report
Annex A (informative) Design principles
Annex B (informative) Survey of general design criteria where
                      tests are not necessary

Defines test procedures to evaluate; the risks of decay to windows made of different materials, through increased moisture accumulation from condensation or water vapour diffusion; and the influence of deformation on basic performances of windows made of different materials exposed to different climates between their internal and external faces. Relates only to initial type testing, i.e. developments or changes in designs. Does not relate to routine quality control or to proven designs.