The glazing units still have not arrived-the manager won't even promise a firm date.

The glass skins can be single or double glazing units with a distance from 20 cm up to 2 metres.

Prepare the frame to receive the glazing units.

It may be suggested that the window frame or complete door has to be replaced due to damage to the double glazing unit.

Therefore, insulated glazing units consist of two or more panes to reduce the transfer of heat.

(Due to air convection between two panes of glass, the bottom part of the glazing unit is always colder than the top part.)

An evacuated glazing unit is made by sealing the edges of two glass sheets, typically by using a solder glass, and evacuating the space inside with a vacuum pump.

Krypton, which is considerably more expensive, is not generally used except to produce very thin double glazing units or relatively thin, or extremely high performance triple glazed units.

In the UK, the term "grille" tends to be used only when there are bars sandwiched within the insulated glass glazing unit, and not stuck to the outsides of it.

As far as noise reduction is concerned, sealed double glazing units have about the same value as having the window reglazed with glass twice as thick as the original glass.

These claims should be investigated very closely as it may be possible for a local glazing firm to carry out a satisfactory replacement of the glass or glazing unit without replacing the window frame or door.

High thermal resistance can be obtained by evacuating or filling the insulated glazing units with gases such as argon or krypton, which reduces conductive heat transfer due to their low thermal conductivity.

The second layer can be added as a separate, usually movable, pane inside your existing window (known as secondary glazing), or can be provided by fitting a twin-wall sealed glazing unit in place of the usual single pane.

Furthermore, because of the atmospheric pressure present on the outside of an evacuated glazing unit, its two glass sheets must somehow be held apart in order to prevent them flexing together and touching each other, which would defeat the object of evacuating the unit.

Common types of glazing that are used in architectural applications include clear and tinted float glass, tempered glass, and laminated glass as well as a variety of coated glasses, all of which can be glazed singly or as double, or even triple, glazing units.