the action of natural atmospheric conditions on any material exposed to them. Includes both physical disintegration and chemical decomposition caused by the elements; of rock and rock mantle mainly by temperature extremes, solution, and hydrolysis; of timber mainly by moisture changes causing alternate shrinking and swelling by oxidation, and by the erosive effects of rain, hail and wind-blown particles of dust and sand. Does not include fungal decay.
the combined detrimental influences of the outdoor environment (for example sunlight, ozone, oxygen, humidity, temperature) on a material
Foreseeable actions – potential degradation factors that may affect the compliance of the works with the essential requirements. They include, for example, temperature, humidity, water, UV radiation, abrasion, chemical attack, biological attack, corrosion, weathering, frost, freeze-thaw, fatigue (i.e. actions related to "normal" agents that could be expected to act on the works or parts thereof).
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