All about windows

Double Glazing

The term ‘double glazing’ refers to windows and doors that are fitted with a sealed unit, comprising two panes of glass with a bar around the edge. The edge is then sealed with a special sealant to prevent air and moisture entering the sealed unit,. The full name of this sealed unit is known as a hermetically sealed insulatiion.

Triple Glazing

Triple Glazing is similar to double glazing with an additional pane of glass for extra insulation.


Although the first double glazed units were experimented with in the 1950s, it was in the early 1980s that the double glazing industry took off. Windows had, until that time, been manufactured in steel (e.g. Crittall windows) or timber.

Patio wheels

These are the roller wheels located at the bottom of an inline sliding patio doors.

Roller wheels on aluminium patio doors are usually fastened in from under the glass so the bottom section of the patio frame needs to be removed to get to the fixing screws.

Two screws hold the bottom section of frame in place. They are located on each of the side sections of frame through a hole near the bottom of the door.

The door must be lifted out of the frame and laid flat before this work is undertaken.