...Did you know that over 30% of secondary glazing is installed in windows where double glazed windows are already installed and many of them in new build properties? In inner city areas and on main roads double glazing may not be sufficient enough. For extreme circumstances, we have a Heavy Duty system that can take double glazed sealed units. Read more...
The reason secondary glazing is so effective is that like all good sound proofing (i.e. in a recording studio) the best results are achieved where there is an adequate air gap or cavity between the two points of contact (i.e. cavity between the primary window and the secondary glazing). You can also use acoustic tiles in the air gap if you wish to achieve maximum sound insulation.
We also recommend that you use a different thickness of glass in your secondary glazing than is in your existing windows, this is due to the fact that a different thickness's of glass resonate at different frequencies. See the guidance tab for more information.