Many older homes in Australia have exceptionally thin windows that are easily broken and do absolutely nothing for the insulation of your home. Replacing the glass in your existing windows can be reactive to a broken window pane or a proactive step against future cracks that can be dangerous to your family. Plus, with a better grade of glass in your windows (or doors) you can be sure that your home will be better insulated against extreme weather conditions. These older glass windows really suffered in the rain and hail storms of late, and when the glass breaks you're looking at more than just replacing the glass as water damage often occurs once the window is broken.
Types of glass
Standards Australia has published a handbook that explains the standards of glass used in buildings, and the glass in homes built in the 50's and 60's often doesn't meet these standards. Your qualified glazier will be able to advise on the best type of glass for your home (taking into consideration position, structure and weather exposure). You can choose from lots of different colours and treatments ranging from double glazing to stained-glass windows.
Remember that if you're replacing your glass for insulation purposes, you may also want to look at the window frame and consider replacing the whole window. PVC and wood are particularly good for insulation but of course if they're old or warped and let air through, replacing the glass isn't going to have enough of an effect!
Did you know? Very old windows are often thicker at the bottom than the top. Some people think that this is because glass (originally a liquid) flows downwards over the years, whereas in fact the older glass making techniques used spinning to create a round pane of glass which was then cut into a window shape. The outer edges were always thicker due to the spinning process and so experienced glaziers would cut the glass and place the thicker portion of the glass at the bottom of the pane to improve structure and durability.