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that’s interesting. i did contact a firm which specialised in crittall, from memory their glazing was about 12mm (4mm/4argon/4mm) but they said the windows couldn’t be done as they were the wrong type.
They are not the gridded 6 or 8 pane type but large centre tilt 1.25m Sq and side/top openings lights.
The centre tilting means the big panes would be easy to do as they will be horizontal and half in the flat but the weight would be considerable.
Think the frames are not deep enough but i find that odd as they look deeper than the 6x panes in the house I grew up in with Crittall.Nobody else in the 7 other blocks has done a straight glazing replacement, if a firm (without scaffolding and not 20k) did there would be a lot of people interested, at least with secondary we can remove it without much hassle if/when somebody can do double glazed units.
I replaced the panes in our Crittal windows to gas filled double glazed units. We were on the 6th floor and I did ask around but the response was that I’d need scaffolding, which was not cheap (it was also triple aspect). It was pretty straightforward, assuming you don’t mind leaning out of windows and handling big heavy panes of glass, it also cost @ £750 in glass and other stuff, made a big difference though. Obviously the one thing it doesn’t fix is the fact the frame itself is a cold bridge so we’d still get a ton of condensation on the frame. The price you pay for living in that kind of place.