At some point in life, many homes will develop problems around their windows such as leaking moisture, air coming in around the edge of the window, accidental damage such as a baseball being thrown through the window, a window becoming old and worn, or a homeowner may just want to upgrade their windows when they are renovating or redesigning a room or patio doors Canada. Whatever the reason for replacing windows, homeowners will have to decide what type window replacement to use. Two types of popular replacement windows are vinyl and fiberglass replacement windows. Before choosing between the two, it is important to understand the difference between the two types of windows.