The ultimate difficulty is the fact that secondary glazing won't ever possess the thermal efficiency of primary glazing. The hole between the panes will always be bigger than 12mm as it really is mounted over the pre-present frames. They’re rarely used in new building due to their poor insulating https://connerxqbkb.getblogs.net/67186577/new-step-by-step-map-for-fire-rated-secondary-glazing