R
RadiationWave energy transmitted directly from one object to another through the atmosphere or through transparent or translucent materials. The energy radiated is either transmitted, absorbed, reflected or a combination of all three.
RafterStructural members of a roof that support the roof load and run from the ridge to the eaves (Overhang).
RailThe top and bottom horizontal members of the framework of a window sash.
Raised ExteriorAn angled extension from the frame that adds an aesthetically pleasing dimension to the exterior of the window.
Reflective GlassGlass with metallic coatings applied onto or into the glass surface to reduce solar radiant energy and visible light transmission.
ReceptorFraming system consisting of two snap-together extrusions used to contain a window frame head and jambs in a masonry type opening. It allows for deflection and inconsistencies in the openings.
Reflectance BackA measurement in percentage of the visible light reflected back into a room. For ease of seeing to the outside, a lower rating is better.
ReglazeTo glaze a window or door again or to replace broken or defective glass or other glazing material in a window or door. (See Glazing)
Removable GrillesOrnamental or simulated muntins and bars designed to provide a divided light appearance. Generally made of wood, they are applied to the inside of the sash against the glass surface for easy removal.
Removable SashAny sash in a window that can be easily removed without tools or by a major disassembly of the window or door.
ReturnA channel formed in the outer frame of a window or door that accepts sheet rock or some other wall covering. This channel allows for a neat and inexpensive way of finishing. Also the distance from the inside edge of a window or door to the inside surface of the wall into which the window or door is installed measured perpendicular to the wall.
RevealA protrusion on the head and jambs of a window frame, parallel to the wall of the structure allowing room for final trim within the opening in the wall.
RiseIn a window with a curved head, the vertical distance from the uppermost point of the curve to the top of the shorter jamb, if the jambs are different heights.
RollersWheels attached to the bottom of the sash or panel of a window or door that allows it to slide easily.
Roll-formed Screen FrameA method of fabrication in which a flat (usually metal) material is placed on a machine where the material is formed into shape using differently shaped rollers and pressure, thus leaving the shape hollow.
Rough OpeningThe opening built into a frame wall to receive a window or door unit. It is formed with a header along the top that is supported by jack studs on each side. The rough sill at the bottom is supported by cripples. A rough opening is generally greater in width and height than the window or door unit. The framed opening in a wall into which a window or door unit is to be installed.
