New double glazing - cracks in upstairs bay window.

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13 Dec 2011
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Bristol
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United Kingdom
We have recently had new double glazing installed and some cracks have appeared on the inside of the upstairs bay window. They are in the corner where the bay meets the wall and run from underneath the window down to the floor.

There are no obvious issues with the downstairs bay or any of the others in the house.

There are also cracks on the outside that were pre existing and they have obviously been filled with something at some point in the past. (many of the houses on the street seem to have similar cracks on the outside.) Not sure if they are getting wider, but they are certainly more noticeable - perhaps because we are looking closer.

To be fair, when we rang the company they were straight back out and appear to be very reputable. The guy said that he was pretty confident it was minor settlement and to keep an eye on it for a few weeks to make sure the cracks don't get any bigger, then they will come back and sort it. If it does get worse they will investigate further.

The windows that were replaced were old poor quality PVC windows, much thinner than the new ones.

It is hard to tell if the cracks are getting bigger or not, you can just about fit a 10p in at certain points, though what is concerning is that you can feel a definite draft coming through (though no daylight or anything).

Should I leave it to the double glazing company to come back and make good if the cracks don't get worse over the next few weeks, or should I seek a second opinion?

 
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Only time will tell.
Any gaps above upper window at roof level.?
Glass can be fixed to eitherside and will crack if any further movement.
 
I've got exactly the same situation (and potential problem).

Could anyone provide any more information?
 
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Using a blob of No Nails or Superglue fix a short length of glass, (about 6" long x 2" wide) across the gap. Leave it in place for a few weeks at least. If there is more movement the glass will crack/break.
If it doesn't crack/break, and the adhesive is still attached, then no more movement has occurred.

Obviously if it does break you will need to get it looked at by a professional.
 

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