 
Types of Window Frames
Window frames are available in a
variety of materials, each with its own benefits and drawbacks:
- Wooden frames have higher R-values, but require more
maintenance such as painting and staining in order to prevent
warping and sticking.
- Aluminum frames conduct heat and are prone to
condensation.
- Vinyl frames are made of PVC or polyvinyl chloride,
and have moderate to high R-values. They require little
maintenance, but are not as strong as wood or metal.
- Fiberglass frames are fairly new and have some of the
highest R-values. They are good for insulating and will not warp,
shrink, swell, rot or corrode.
Spacers are used to separate panes of
glazing material within the window. Aluminum is a common spacer
material, but it conducts heat. As a result, during cold weather,
the R-value of the edges of the window may be lower than that of the
center, allowing heat to escape and condensation to form along the
edges of the window frame.
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