Glazing is an integral part of window refurbishment and manufacture. It plays a major role in the thermal performance of a window as well as the window’s ability to reduce noise penetration into a building. There are multiple types of glazing which Fergmann can install depending the specific requirements of a project.

Traditional glazing – Traditional window restoration usually requires the use of single glazing in order to keep the windows as close to their original state as possible. Crown glass which is manufactured using traditional methods is often found still intact in old windows and if the building is listed it may be necessary to have it specially made for a project however, modern clear float glass is usually accepted as an alternative as it is more common and easier to produce.

Double and triple glazing – Traditional glazing is not always a requirement and there are ways that modern glazing can be incorporated to improve the safety and performance of traditional windows. With some modification to the window it is usually possible to incorporate double glazing which can significantly decrease heat loss. Modern double glazing can be manufactured to have a low profile, thin spacer bar which allows for the window to be kept as close to its original appearance as possible. Triple glazing is also available however it is greater in thickness and weight than double glazing and may not be suitable for application in many traditional windows.

Glazing for safety – If the glass is to be installed at below 800mm from finished floor level, toughened glass can be introduced to meet modern safety requirements. Laminated glass is an ideal option for safety especially when installing large panes as it is designed to hold together when damaged. Laminated glass is commonly used in rooflights and on doors and screens.

Fire Glass – Fire rated glass is used in the manufacture of fire screens and requires strict instructions to be followed when it is being installed to ensure that it performs correctly if it ever has to be used. Different grades of this glass are required depending on whether the fire screen is located internally or externally and how long the glass should maintain its integrity and insulation in the event of a fire.

Secondary glazing can be installed internally, separate to the window to improve thermal performance and noise reduction. Using secondary glazing can be an alternative to modifying original windows for double glazing or it can be used in addition to double glazing to further improve performance. Fergmann are authorised installers of Granada Secondary Glazing. Follow the link below for more information.


“I have used this company to restore window frames on a couple of properties and have to say the quality of workmanship was brilliant. Fully recommend.” – GordonY-4 on

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