Lock Up Safely with Double Glazed Sash Windows It’s more likely to break in through sash windows with no extra glazing. Double glazing add strength to the window. You get added protection when modern fittings are installed. Peace and Quiet with Upgraded Windows Constant sound is a common problem https://expertsashwindowreplaceme85060.blogrelation.com/41092989/how-to-increase-your-property-with-double-glazed-sash-windows