Permanent secondary glazing
Available from: specialist glazing companies Installation: by professionals
These products work by forming a sealed, insulating air gap on the inside of existing, single glazed windows. To work properly there should be at least 1cm between the existing and secondary glass.
• installing a new double glazed glass unit into the existing sash;
• replacing existing sashes with new, double glazed sashes;
• installing separate aluminium-framed secondary glazing on the inside of the existing glazing, typically installed as sliding panes in frames fixed to the internal window sill, jamb and head reveals.
The advantage of these types of products is they can be installed without having to remove the window and replace it, and depending on the type you get, they can be customised to almost any type or shape of window meaning there is no change to the exterior look of your home, and the windows remain functional. Your view will still appear as if you’re looking through glass, but the glazing panels used tend to be significantly stronger and far less likely to shatter.