Install secondary glazing#
Install secondary glazing
Secondary glazing is generally cheaper than double glazing, helps with the draughtproofing, and can be more acceptable in some listed buildings, but it is perhaps half as effective. A lot depends on how well the windows fit and the distance between the panes. 12mm is the ideal for heat loss, although a bigger distance is better for noise reduction. On stained glass, it goes on the outside and with a big air gap to keep the window dry, making it less effective.