wrightyson on "Measuring up for new double glazed units - help please!"

Externally or internally beaded?? If internally pop beads out using two pallet knives and measure width height and thickness! Externally bit trickier due to the double sided tape applied to the inner pane and frame. This will need to be cut anyway when it comes to replace so do that and repeat as above. Or as above take 10 mm off!