Unlike vinyl windows, fiberglass frames can be painted anytime you decide to change the decor of just one room or your entire house. Another key advantage of the fiberglass frame material is that it expands with temperature changes at almost the identical rate as the window glass. This results in a consistently airtight fit no matter what the season or time of day is. In contrast, vinyl expands about seven times more than glass and aluminum expands about twice as much as glass. With its superior strength, fiberglass frames offer the possibility of more unique shapes and styles of windows.
Typical sliders can be heavy and difficult to remove for cleaning.
On the former, the hopper sections are located above and below the casement. The hoppers are secure, yet provide ventilation. With the turn of a handle, tilt-turn windows can pivot in from the side, like a reverse casement, or pivot at the bottom like a hopper. Fiberglass windows are tops in energy efficiency. This is more effective than insulated vinyl frames because the strength of fiberglass does not require all the interior webs in vinyl frames.