Glossary of Terms
During your window or door project you will hear many unfamiliar terms used by architects, contractors, dealers or manufacturers. We hope this glossary of terms will prove a useful tool.
A window that is hinged to open either outward, inward or is fixed. Hinged casement windows include:
Hinged at the top.
- Center Pivot (dean)
Rotating on a center horizontal or vertical axis.
Hinged at the bottom.
An abrasion resistant, pre-finished, extruded aluminum material put on exteriors for a low maintenance finish.
A window with two movable sashes that slide in a vertical track.
A window pane where two panes of glass are set together to improve insulation.
Type of hardware which allows casement windows to open and stay in place.
Poor sound barrier with weak insulating properties, commonly found in older homes.
Two pieces of glass bonded together with a Polyvinyl Butyral (PVB) interlayer, for sound attenuation, UV reduction, security and earthquake safety.
Less penetration of UV light rays, improved insulation, higher R rating, most often found in insulated glass units.
Safety glass that resists breakage.
The wood surround (top, two sides and the sill) of a window or door that fits into a rough opening in a structure. A sash fits inside the jamb.
A piece of glass surrounded by wood- also called a pane. Often used when referring to multiple panes.
The narrow strips of wood between lites.
A curved ornamental part that hangs down from the lower corners of upper sashes in double-hung windows.
As in window pane, also called a lite.
A small strip of wood that runs vertically to separate the upper and lower sash of a double-hung window.
A wheel with a grooved rim set at the top of a jamb; used for guiding the sash cord in double-hung windows.
Air-tight, water-tight sealant used on window exteriors.
A horizontal member that fits between vertical members to form a window sash. There is a top and bottom rail on each window sash.
The wood that surrounds a pane or panes of glass. Consists of a top rail, bottom rail, a stile on each side and muntins if more than one lite (pane).
Small ropes that connect controlling weights to the sashes of older double-hung windows.
The horizontal member at the bottom of a window frame.
Simulated Divided Lites (SDL)
Muntin bars are permanently adhered to both sides of a piece of glass to give the impression of separate panes.
The vertical member of each side of each sash, joined together by stop and bottom rails.
The shelf-like wooden member on the inside of a window commonly referred to as the “window sill”.
True Divided Lites (TDL) or Authentic Divided Lites (ADL)
When wooden muntins surround individual panes of glass in a sash.