In message , Pinot Grigio
writes
A large double-glazed window has developed a crack from one corner about 12
inches toward the centre of the window.

The heat and cold is making the crack grow longer.

What can I do to stop the crack travelling further. Cellotape probably
won't work because of condensation.
I can't get the window fixed for at least 6 weeks.

Drill a hole just past the end of the crack. This will disperse the
stress - worth a try at least

--
geoff