Window & Door Terms - R
- Window & Door Terms - R
- R-Value
- The resistance to heat flow through a material. The higher the number, the greater the resistance.
- Rail
- The horizontal top or bottom piece of a door or window frame or sash.
- Rim
- Rough-in frame work. 2x10s placed along the foundation of a home, which supports or is nailed to the floor joists. The side of the 2x10s measure 1 1/2" and are placed down on the foundation.