The good news is that secondary glazing when put in near proximity to the main window can provide great thermal advancements. So far as toughened glass, The fundamental solution is usually 4mm toughened glass. From there, it is possible to upgrade to 6mm toughened glass for enhanced thermal insulation and https://bridal-photography03455.techionblog.com/26858236/a-secret-weapon-for-secondary-glazing-installation