The thermal performance isn't as high as that of a complete double or triple glazing substitution. This is because of the massive advance in sealed insulating that double and triple glazing units have, trapping gases in between the panes. Polycarbonate secondary glazing is ideal for all homes that have solitary https://elliottmdvoh.blogscribble.com/29688848/secondary-glazing-things-to-know-before-you-buy