Secondary glazing is changing your present windows from single glazing to some type of double glazing. This is certainly performed by including a second layer (generally very clear acrylic and not glass) for your windows. A 20mm translucent standing seam polycarbonate system. Created for translucent canopies and walkways. Sign up https://kylerzpfsf.blogchaat.com/34705575/indicators-on-window-retrofit-you-should-know