We utilised them for secondary double glazing on quality 2 shown crittall windows and they are delighted with the results. Definitely interesting work references in heritage windows and hugely advise them. A different crucial query to inquire is: does secondary glazing perform? In short, Indeed; however its efficiency depends https://beauty-products65431.jiliblog.com/91277816/the-5-second-trick-for-secondary-glazing