Double glazing should last for many years and weather well – that’s what it is designed to do. But 13% of the double glazing owners we spoke to had problems in the first 10 years after installation.

Q: I live in a 1980 rancher with original wood, non-tilt, double-hung windows. I was raising the lower sash to let in fresh air when I heard a loud noise, like a metal spring breaking, and the heavy ...