Dictionary

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Laminated glass

Consists of two or more layers of glass with an interlayer of PVB. The interlayer material and the sheets of glass are bonded together under heat and pressure. Is applied to avoid breakage and risk of glass falling down when broken. The interlayer can also give the glass a higher sound insulation rating.

Lamination

Strips of wood glued together. This allows wood of inferior visual quality to be used as interlayer. At the same time the wood profiles are stabilized.

Leaded lights

Windows made from coloured glass (stained glass) which have been arranged to create an abstract design or pictorial image. The glass is held in place by lead work.

Lead work

The strips of lead soldered together between panes of glass.

Lever

Handle on an Espagnolette bracket.

Light-admitting area

The net area of a window made of the visible part of the pane.

Lights

Originally the section between the posts in a half-timbered house. Today it is used to tell the number of casements/sashes in a window. E.g. Leaded light, four light windows, six light windows, multi light windows with special features.

Linseed oil

The oil obtained by pressing of linseed (or flax, common flax). Linseed oil is an environmentally friendly product. When applied it gives the tree a deep glow and wood treated with linseed oil captures water more slowly than untreated wood.

Linseed oil putty

Chalk mixed with linseed oil.

Loose-joint butt

A hinge in two parts. One fixed on the casement, the other on the frame. By lifting the window up, off the vertical pin, the window may be removed without unscrewing the hinges.

Louver

The opening in the roof above a fireplace with no  chimney.

Lower frame

The lower part of wood in the window sill.

Lt

A figure to indicate the percentage of daylight transferred through the pane. For common non-coated float glass Lt exceeds 80 %.

Lunette

A lunette is commonly called a half-moon window, when the space is used as a window.