Maximum width for domestic double glazing

[festive]

We are in a bit of a 'discussion' without our window fitters as a few years down the line nearly all the glass units have failed with condensation.

Now.. a few of these units are quite big, one i think is 3.6metres wide by about 1.90 tall.

Now we were told regs have changed since these windows were fitted 5 years back, and this glass is no longer available, and we have to fit two panels with a mechanical strapon thing up the middle (no i can't remember its actual name).

Is this right, is this our only option?

 

[keveljay]

Not sure on max width - biggest I've done in domestic is 3300mm but that had to be laminated and weighed a ton (not literally).The main problems with large sealed units is the deflection at the centre of the unit which simply means when installing into the glazing rebate, the corners can be kissing the underside of the frame/transom and the centre can 'belly' down making it really difficult to lift the centre in, if you get my drift.