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Glazing options

Sashed glazing units

Sashed offers a range of glazing options to suit our range of products, your property and your requirements:

Standard double glazing

Our standard double glazing is 24mm units, used in our casement windows, sliding sash windows, and doors. Standard double glazing is suitable for period properties in conservation areas along with new builds or new extensions. Standard 24mm double glazing are our most popular units, they are made of 4mm glass on the outside, 16mm space filled with Argon gas to prevent heat transfer and 4mm glass on the inside (4/16Ar/4), offering excellent U-Values with soft coat low emissivity (low-e) Argon filled units and a centre pane U-Value of 1.1 W/m²K.

Vacuum insulated glazing

Our LandVac™ vacuum glass is 8.3mm thick and has a centre-pane U-value of just 0.4W/m2K which allows for lower energy consumption, reducing CO2 emissions and bills. Vacuum glass is lightweight, uses less materials, is fully recyclable, and does not use any energy intensive Nobel gases such as Argon, Krypton, or Xenon. The acoustic performance is also extremely good.

Conservation glazing

Our conservation glazing units are the perfect choice for sliding sash windows in period homes where the use of double glazing should be more discreet. Our conservation glazing is 18mm, which suits all period homes and sometimes listed buildings. Our 18mm soft coat (low-e) conservation glazing consists of 4mm glass on the outside, 10mm space filled with Argon gas and 4mm glass on the inside (4/10Ar/4). This gives a centre pane U-Value of 1.4 W/m²K.

Slimline glazing

Our slimline glazing comes in 12mm, 13mm, 14mm, 15mm and 16mm units. Slimline glazing is not something we recommend to customers due to it fragile edge seals, limited guarantee terms, limited life span, and poor thermal performance. Vacuum insulated glass is a much better choice when slim glazing units are required. U-values for slimline glazing depends on the size of the Krypton gas cavity: 4.0mm cavity = U-Value 1.9 5.0mm cavity = U-Value 1.7 6.0mm cavity = U-Value 1.4 8.0mm cavity = U-Value 1.3

Specialist glass and single glazing

We can supply specialist glass such as intelligent glazing, self-cleaning glass, extra clear low iron glass, acoustic glass or even solar control glass. We can also use single glazing where permitted (such as listed buildings); the use of single glazing means that the new windows will not meet current thermal standards and is usually not permitted for use unless the building is listed.

Toughened glass

Toughened glass is required to comply with building regulations in certain situations. Toughened glass is up to five times stronger than ordinary glass which means that it has to be hit much harder in order to break, and if it does break then it will break into lots of small pieces which are much less dangerous.

Laminated glass

Laminated glass has the same strength as ordinary glass but it consists of two pieces of glass with a sandwich of a plastic interlayer. If the glass breaks, the fragments of glass are held in place by the interlayer. In fully framed installations the broken glass retains a residual strength while awaiting replacement. Laminated glass is sometimes used in front doors, where extra security is required, we can quote for this on request.

Triple glazing

Triple glazing is the ideal choice for larger glazing areas, such as sliding patio doors, as it allows maximum glazing sizes with minimum heat loss. The improved sound installation of triple glazed units can also increase the acoustic performance.
Our standard triple glazed products are glazed with Low-E Argon gas filled units. The units consist of 4mm glass on the outside, 8mm space filled with Argon gas to prevent heat transfer, another 4mm of glass, another 8mm space filled with Argon gas, and 4mm glass on the inside (4/8Ar/4/8Ar/4). Our triple glazed products offer superior U-Values with soft coat low emissivity (low-e) Argon filled units and a centre pane U-Value of 1.0 W/m²K.
Centre pane U-Values as low as 0.7 W/m²K can be achieved by using triple glazing units consisting of 4mm glass on the outside, 12mm space filled with Argon gas to prevent heat transfer, another 4mm of glass, another 12mm space filled with Argon gas, and 4mm glass on the inside (4/12Ar/4/12Ar/4). This type of triple glazing is only suitable for use certain sliding patio doors, and tile and turn profiles.

Frosted and obscured patterned glass

Glazing is an important design element for any building and can make all the difference when creating a feature window or door. It can also make a significant difference to your privacy.
Frosted glass in a timber sash window
In addition to frosted glass (as shown above) we offer a variety of obscure glazing patterns which offer various levels of privacy. We use Glass Solutions from Saint-Gobain, which is a leading manufacturer of glass throughout Europe. You can choose from the following options:

Glazing spacer bars (Warm Edge Spacers)

Glazing spacer bars refer to the edge of a sealed double or triple glazed unit. Spacer bars are used to separate the panes of glass by a specific gap and it’s what you see when you look inside your double glazed unit. For many years the standard spacer bar was made from aluminium, which conducts heat or cold, this can lead to higher levels of thermal loss and a reduction of energy efficiency. In recent years, double and triple glazing has moved away from the colder aluminium spacer bars and embraced warm edge spacer technology. The Warm edge spacer is a slightly different type of spacer bar. The term warm edge is based on the fact that the construction is fabricated and designed to conduct less heat or cold than traditional aluminium spacer tubes. Units fabricated using warm edge spacers can have a warmer internal edge temperature of up to 65%, reducing the likelihood of condensation by up to 70% and increasing thermal efficiency.
We use warm edge spacers on all our products as standard, unless aluminium spacers are specifically requested, or where the limitation of glass type means aluminium spacers are the only option.
White warm edge spacers in a hardwood timber <a href=“/windows-and-doors/wooden-french-doors/“>French door</a>
Warm edge spacers come in a wide range of colours, and unless a specific colour is requested we automatically select the colour of spacer bar to match the paint colour. For example, products which are white inside and outside will have white warm edge spacers, as shown in the above picture.

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