Insulated windows are much more impact resistant than plain stained glass windows, however, they are still glass and can be subject to vandalism or projectiles thrown from lawn mowers and weed eaters. In order to repair an insulated window properly, it must be removed and taken to our facility. The window is then separated, removing the exterior panes of glass and the thermal seal. The leaded glass window is wiped down and a new dessicant seal is applied (not caulking). Both pieces of tempered glass are replaced for quality control and warranty issues. The newly assembled unit is then properly sealed in our heated roller press. We do NOT warranty Wrought Iron IG panels, or panels that have been insulated with waterproofing still in the channels.