UPVC Windows Repairs
It is a good idea if you have upvc window seal windows in your home to clean them and repair black upvc windows windows (see this) any damage. It is also advisable to hire an expert in window handles for upvc fitting to help you with repairing flush casement upvc windows windows.
Finding out if the crack has occurred on only one side of the window
You should always ask the right questions when investigating glass breaks, particularly when it is the first time you've witnessed it. In fact, identifying the source of the break could be as crucial as repairing it. For example, you may need to think about replacing springs, instead of simply reseating it. You'll need to be aware of the manufacturer of the window you're using in order to do this. By comparing the specifications of two brands, it's likely to discover one that is more compatible with your sash.
Finding the cause of a break is a multi-step process, and involves assessing the glass in question, as well as the surrounding frame.