Three types are mainly offered:
Wood frames
Considered the most attractive window frames available today. It can be stained varnished or painted to match color scheme of the house. Wood frames are high maintenance, they require sanding and staining, and the outer frame will require re-finishing every few years.
Metal frames
Available in various colors and natural finishes, may react badly to sea-air and can easily corrode if not protected by factory applied finishes. They are less expensive than wood frames.
Vinyl Frames
A maintenance free window frame, it does not conduct heat very well and therefore considered a good thermal insulator. There are insulated and standard vinyl frames, where as the insulated vinyl has improved thermal insulation quality. Vinyl comes in different wood grain finishes and does not require painting or finishing.
Fiberglass Frames
The most expensive option of all, they don’t need to be painted or caulked often, and they have high insulation values. Fiberglass changes and expands almost the same as window glass in extreme temperature changes, which make it stay fit in-place. They are very favorable in rough weather locations. It is stronger than vinyl.
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