Conservation stained glass maintenance works on the principal of prevention rather then cure. If a 25 year maintenance schedule is implemented when a leaded window is in Stage One of deterioration, the window will last for centuries. This maintenance program follows the guide lines of the Burra Charter. The principles include: do no harm to the window, maintain the original fabric of the window where possible, be flexible to the individual requirements of the window. In practical terms, repair glass and lead where possible rather then replacing, on-site slurry puttying of windows to rejuvenate the oil based putty to maintain structural integrity and water resistance. Windows are only removed when necessary. Steel bars are checked and treated with rust preventer, wire ties are checked and replaced as needed, vents are repaired to meet standards.
This form of stained glass conservation ensures the fabric of the window remains intact into the future.