Evaluation of protective glazing systems

Protective glazing systems are widely accepted as a preventive conservation method for stained glass windows in Germany and other European countries. However, the ventilation of the interspace between the original and the protective glass has to be well adapted for each object since the intrusion of air pollutants and the occurrence of condensation can still cause damage. The efficiency of protective glazing systems can be evaluated by glass sensors, which consist of highly sensitive model glasses, reacting to the local corrosive impact within one year of exposure. This paper concentrates on the comparison of case studies in Gloucester (UK) and León (Spain), to include the environmental impact measured on unprotected windows.