Window Terms Glossary

Radiation: The transfer of energy or heat in the form of electromagnetic waves from one surface to another.

Rail: Horizontal member of a window sash or door panel.

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.Retrofitting: Adding or replacing items on existing buildings structure.

Reflective Glass: Window glass coated to reflect radiation striking the surface of the glass.

Replacement window: is a window that is installed in an existing window opening.

Rough opening: The opening in a wall where a window or door will be installed.
Round Top: A true half round with extended legs.
R-Value: A measure of resistance to heat flow. A high-R-value window has a greater resistance to heat flow and a higher insulating value than one with a low R-value.