In no way is the small movement occurring on the windows causing the glazed units to crack.
These words come as part of a brief and incomplete set of answers provided by John Green of Wood Newton when we raised a number of concerns, including questioning why one of our windows, and one of our neighbours windows, had cracked with no impact or other obvious outside cause.
Well, the official line is the “small movement” in the frames isn’t causing the cracks. We’d love to know what is. But don’t expect a straight answer.
Would you consider this curvature a small amount of movement? Would any reasonable person?
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And the crack has today crept further across the full length window. I’m not happy with how it’s looking at all now. Still small in relation to the glazing, but it’s probably now about 1/4 or more across the window now!
As far as I’m concerned is was the, not so, small movement that cracked one of our windows, which also happens to be the window/ frame where we have had a small water leak. Lucky or unlucky (only time will tell) it is the only leak we have had (so far), and the second time we had people round to fix it seems to be holding out.
But as far as the curvature on the window shown in your pictures, I would think this is actually just warped trespass, we had a similar thing by our back door, the fix in our case was to just to add a couple of screws to hold it in place. But since there aren’t screws already on the window section this wouldn’t really work as it would look odd, odder then a curve where there shouldn’t be one? well thats a personal choice. But I wouldn’t personally think that the warp is having any effect on your issues.
If you look at the wood in isolation (and put, for example, a spirit level on it), you can see it has a big curve/warp in the actual window frame and cill.
In a report from Wood Newton it does say that movement in the wood has been an issue due to the sun we get, but latterly denies this has anything to do with people’s windows cracking on site (as quoted above).
Then again, we’ve been told that the water coming through wont affect the timber structure either. So the builders would have it both ways.