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Odd one.
Inside panel of the fixed part of a large sliding glass door.
As far as I know, it's not had any impact.
It's held together but has crazed like a car windscreen.
Only noticed this morning when I pulled the blinds back. Could have happened anytime over the past couple of weeks tbh, it's in a spare downstairs bedroom and has had the (dark) blinds closed to keep the heat down.
It must have had an impact, right?
Google suggests a possible flaw in the glass could have caused it, but it's over 5 years old. Surely it would have gone by now?
North West facing, onto the back garden.
Seals were fine, no condensation.
Anyone else had this?
It can happen for lots of reasons.
Has it been windy?
It can happen through big thermal changes if there are any possible points of sharp contact within the frame. When you strip it out check all round. Be careful when you remove it as it will go and you'll have shit loads of cubes to clean up. Nice thin scraper for removing the beads. Start in the middle. Oh and either measure your glass first to get a new unit ordered or get some ply in.
Yup, very windy with big temperature variations.
Thanks for the responses.
Have you got a picture of the breakage pattern? (May be able to glean something from it.)
Yep as others have said, imperfections in glass during manufacturing and thermal variations, according to the man who fixed our 15ft x 4ft pain at work that did the same of its own accord after about 6 or 7 years. I also have a velux window at home in a very inaccessible location that did the same about 3yrs ago and I have yet to fix, but as the single outer pane is still good I have put it on the long finger.
always seems to be the inside that goes, not the outside, which I find odd.
always seems to be the inside that goes, not the outside, which I find odd
Was the outside of our triple glazed roof panel. 1 in 400 tons according to the supplier, passes the “heat soak” testing but will fail at some point. Ours was after 3 years on a very hot day..
The breakage might be due to thermal stress. Is the window facing the south or west?
I have seen DGU's shatter when someone has lent a picture frame against the DGU or pushed a sofa up against the window.
Facing pretty much north west.
Can't post pictures but has shattered into very small pieces.
It appears to have started about an inch in from the left hand side, about two inches up from the bottom.
Hasn't had anything leant against it, but may have had a wicker basket with some of the granddaughters toys pushed up against it at some point.
We'll get a few quotes today and see how it goes.
Ta folks.
Facing pretty much north west.
My money's still on either thermal shock or the DGU flexing in the wind due to negative pressure sucking it outwards if it's on the leeward side of building in relation to the prevailing wind.
Seen this happen on a block of flats in glasgow when six full glazing units ( frames and all) got sucked off (s****) a full height stairwell in a storm and we had to close Duke Street for nearly a full day until we checked the fixings on the rest of the windows
Nickel Sulphide inclusion.
look for the centre 
The glass should have been heat soaked prior to installation
Hmm, it looks exactly like that - two larger pieces in the centre, spreading from that point.
There's you're answer then. That Figure of 8 crack is a pretty good tell tale.
Thank you. At my least my wife no longer thinks I did it!