Sealed Glass Units
Double Glazed Units
There are many varieties and options available for double glazed units depending on performance requirements. Variations include:
- Glass thicknesses
- Performance coatings
- Safety glass
- Spacer bar types
- Patterned glass
- Gas fill types
Cross section of double glazed sealed unit
Triple Glazed Units
As with double glazing, there are many options for triple glazed units depending on performance requirements. Variations include:
- Glass thicknesses
- Performance coatings
- Safety glass
- Spacer bar types
- Patterned glass
- Gas fill types
High performance triple glazing requires 2 panes of low e glass, made up as: 4mm clear/4mm low e/ 4mm low e.
Cross section of triple glazed sealed unit
Heritage Units
Why the need for Thin Double Glazed Units?
As pressures mount both financially and responsibly to become more energy efficient so does the gap between the performance of aged properties and new. Construction materials are continually being developed to improve the energy rating and the overall performance of buildings, many of these new technologies aren’t suitable for historical properties leaving them expensive to run and sometimes uncomfortable to live in.
Deisgned with history in mind
At Redituff our Superthin Double Glazed Units have been designed specifically with historical properties in mind, improving heat retention therefore lowering energy consumption, reducing noise and improving security, all while still retaining the original aesthetics of the building.
Heritage 4/6/4 unit using Float Glass
The external pane, as used from the late 1950’s onwards, complimented by an internal pane of unique energy saving coated glass. This unit has an overall thickness of 14mm and a centre pane U-Value value of 1.5. 4mm Clear Float Glass / 6mm Krypton Gas Filled Cavity / 4mm Coated
Heritage 4/8/4 unit to achieve a centre pane U-Value of 1.2
Ensuring the criteria for Building regulations document L are achieved. This is achieved using an 8mm Krypton filled cavity. This unit has an overall thickness of 16mm. 4mm Clear Float Glass / 8mm Krypton filled cavity/ 4mm Coated
Argon Gas
As an IGU is sealed, the space between the glass is filled with dehydrated air in order to improve the insulation properties of the unit. Whilst air is considered a good insulator there are superior options available.
For optimum thermal insulation, Redituff Ltd use argon gas to fill the cavity of their insulated glass units. Argon gas is a colourless, odourless and tasteless gas that provides optimum thermal insulation whilst being both nontoxic and inert. The use of argon gas in the units allows them to achieve a higher energy rating compared to units using dehydrated air.
All IGU’s manufactured by Redituff Ltd hold EN1279 Part 3 Pass Certificates, which means that they comply with the legal requirements for the testing of rates at which gas leaks from a unit.
Over time the concentration of gas present within an IGU decreases as it escapes, once the concentration falls below 80% the insulation properties are lost. Even after 20 years, a unit manufactured by Redituff Ltd will still retain 80% of the argon gas it was filled with.
Warm Edge Spacer
Most heat loss from windows occurs at the sealed unit edge where the spacer bar touches the two panes of glass and creates a thermal bridge. Heat has a direct passage from inside to outside which may cause condensation to form. Redituff Ltd use a technologically advanced warm edge spacer system made from a highly insulating composite plastic that reduces the thermal bridge between the two panes of glass, thereby reducing condensation and cold spots. This bar differs little in appearance from conventional spacer bars and complies with EN1279 Parts 2 and 3.