Wooden Window

Craftsmanship making history.

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.

Casement Window
A window that is hinged to open either outward, inward or is fixed. Hinged casement windows include:

  • Awning
    Hinged at the top.
  • Center Pivot (dean)
    Rotating on a center horizontal or vertical axis.
  • Hopper
    Hinged at the bottom.

Clad
An abrasion resistant, pre-finished, extruded aluminum material put on exteriors for a low maintenance finish.

Double-Hung Window
A window with two movable sashes that slide in a vertical track.

Double-Paned/Insulated Glass 
A window pane where two panes of glass are set together to improve insulation.

Friction Hinge
Type of hardware which allows casement windows to open and stay in place.

Glass Types:

  • Annealed
    Poor sound barrier with weak insulating properties, commonly found in older homes.
  • Laminated
    Two pieces of glass bonded together with a Polyvinyl Butyral (PVB) interlayer, for sound attenuation, UV reduction, security and earthquake safety.
  • Low-E
    Less penetration of UV light rays, improved insulation, higher R rating, most often found in insulated glass units.
  • Tempered
    Safety glass that resists breakage.

Jamb
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.

Lite
A piece of glass surrounded by wood- also called a pane. Often used when referring to multiple panes.

Muntins (Mutts)
The narrow strips of wood between lites.

Ogee Lug
A curved ornamental part that hangs down from the lower corners of upper sashes in double-hung windows.

Pane
As in window pane, also called a lite.

Parting Bead
A small strip of wood that runs vertically to separate the upper and lower sash of a double-hung window.

Pulley
A wheel with a grooved rim set at the top of a jamb; used for guiding the sash cord in double-hung windows.

Putty/Glazing Compound
Air-tight, water-tight sealant used on window exteriors.

Rail
A horizontal member that fits between vertical members to form a window sash. There is a top and bottom rail on each window sash.

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).

Sash Cord
Small ropes that connect controlling weights to the sashes of older double-hung windows.

Sill
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.

Stile
The vertical member of each side of each sash, joined together by stop and bottom rails.

Stool
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.

About Wooden Window

Since 1980, Wooden Window has been restoring and constructing fine wooden doors and windows for residences and commercial buildings throughout California.

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