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GLOSSARY OF INDUSTRY RELATED TERMS |
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Please click on a letter to show available
definitions. |
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R-Value |
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Resistance to thermal transfer or heat flow. Higher R-value numbers indicate greater insulating value. It is the inverse of the U-Value (R=1/U). |
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Rail |
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The horizontal top and bottom members of a window sash or door panel. |
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Replacement Window |
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A window designed to fit into an existing window opening. |
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Rough Opening |
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The framed opening in a wall into which a window or door unit is to be installed. |
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