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Composite Door Configurator

Glossary of Terms

Argon: An inert, non-toxic gas used in insulating glass to reduce heat transfer.

Astragal: Centre post between two swinging doors or Georgian panes.

Backbedding: Material or compound used to seal the glass to a window sash.

Bay: A combination of window units that projects to the exterior. Usually features a large centre unit with two flanking units at 30 or 45 degree angles to the wall.

Bevelled Exterior: An angled extension from the frame that adds an aesthetically pleasing dimension to the exterior of the window.

Bottom rail: The bottom horizontal member of a window sash or door panel.

Casement: Window with sash cranking outward, to the right or left.

Casing: Exposed moulding or profile around a window or door, on either the inside or outside, to cover the space between the window frame or door jamb and the wall.

Cellular PVC: Extruded polyvinyl chloride material used in window and door components and trim. Unlike rigid (or hollow) vinyl, it features a foam or cell-structure inside. It can often be nailed, sawn and fabricated like wood.

Cellulosic composite: Generally, a material combining an organic material, such as wood fibre, extruded with a plastic.

Chamfered( bevelled) internal bead:  Flat edge profile.

Composite:  Window or door components that consist of two or more materials, such as glass fibers or wood and plastic. Also for windows and doors that combine two or more materials in the frame or sash construction, such as witha wood interior and a vinyl or aluminium exterior.

Cill: The main horizontal member forming the bottom of the frame of a window or door.

Cill pan: A product placed under a window or door during the installation process that is designed for water drainage.

Fanlight: A half-circle window over a door or window with radiating bars.

Extrusion: The process, in which a heated material is forced through a die, used to produce aluminium, vinyl (PVC) and other profiles or components used in the production of windows and doors

Fenestration: An architectural term referring to the arrangement of windows in a wall. From the Latin word "fenestra," meaning window

Head: Main horizontal frame member at the top of a window or door.

Hinge Bolts: Secure system to prevent opening windows from being levered from the frame on the hinge side.

Internally beaded: Prevents glass from being removed from the outside.

Low-emissivity (Low-E) glass: A coated glass product that reflects heat.

Mullion: A component used to structurally join two window or door units.

Multipoint lock: A locking system, operated with one handle, that secures a window or door at two or more locking points.

Nailing fin: An accessory component or integral extension of a window or patio door frame that generally overlaps the conventional stud construction and through which nails are driven to secure the frame in place.

Panel: Component, usually wood, mounted within stile-and-rail members of doors. Also used to refer to the entire door.

PlatinumNRG:: Unique product range from Whiteline with high energy ratings.

PVC: Polyvinyl chloride. An extruded material used for window and door framing.

PVCu: Polyvinyl chloride that is unplasticised

Rail: Horizontal member of the framework of a window sash or door.

R-value: Resistance to thermal transfer or heat flow. Higher R-value numbers indicate greater insulating value. R-value is frequently used by the insulation industry and is the reciprocal of U-valur, a value more generally used in the window industry.

Sash: An assembly of stiles and rails (vertical and horizontal members) made into a frame for holding glass.

Slab: A complete door panel that has not been prepared for installation into a frame.

Sculptured (rounded) internal bead: Rounded Profile

Self-cleaning glass: Glass treated with a special coating. Currently, commercially available products feature a coating that uses the sun's UV rays to break down organic dirt through what is called a photocatalytic effect. The coating also provides a hydrophilic effect, which reduces the surface tension of water to cause it to sheet down the surface easily and wash away dirt.

Shootbolt Security lock: Highly secure lock, provides five locking points between opening windows & frame

SlimSASH: Unique Whiteline product with slimmer profile than the standard sash profile.

Tenon: A rectangular projection cut out of a piece of wood for insertion into a mortise

Tilt window: A single- or double-hung window whose operable sash can be tilted into a room to allow cleaning of the exterior surface on the inside.

Transom: Window used over the top of a door or window, primarily for additional light and aesthetic value.

Triple glazing: Use of three panes of glass or plastic with two airspaces between. Generally refers to a sealed insulating unit.

U-value: Rate of heat flow-value through the complete heat barrier, from room air to outside air. The lower the U-value, the better the insulating value.

Unison lock: A casement locking system which secures the window at two locking points by operation of one handle.

Weld: A term used for a type of corner construction, used with vinyl and other types of windows and doors, in which a small amount of material at the two pieces are melted or softened, then pushed together to form a single piece. This also is referred to commonly as a fusion-weld.

XYZ: If you need an explanation for any terms not included here, please contact us. We’ll get back to you and add to this list as we go.