Glass for your conservatory
The choice of glazing determines the use of the conservatory - from greenhouse to living space.
Single-glazing Ug-Value 6.0 W/m2K
Ug-value 6.0 W/m2K acc. to EN 673
It consists of float glass; due to high heat loss and problems with condensation this glazing type is only suitable for greenhouses or, as laminated safety glass, for roofing. Glass pane thickness ranges from 4 to 10 mm, depending on size.
Double-glazing Ug-value 3.0 W/m2K
Ug-value 3.0 W/m2K acc. to EN 673
Usually consists generally of two, 4 mm thick float, glass panes separated by spacers, enclosing a hermetically sealed air space. Spacers are filled with a desiccant which absorbs humidity from within the air space.
Due to insufficient heat insulation, this formerly standard type of glazing is no longer used.
Insulated double-glazing Ug-value 1.1 W/m2K
Ug-value 1.1 W/m2K acc. to EN 673
Glass structure complies with double-glazing structure. Commonly, the inter-space between the panes is 12 – 16 mm. Compared to double glazing, its improved thermal performance is due to an almost invisible thin coating of metal oxide and the gas contained in the inter-space. The glass used on the inner side of the overhead glazing is laminated safety glass.
Today's standard glazing for conservatories, windows, doors etc.
Triple-glazing Ug-value 0.5 W/m2K
Ug-value 0.5 W/m2K acc. to EN 673
The glass structure is similar to insulated glazing structure, but consists of three panes of glass and two spacers enclosing two hermetically-sealed inter-spaces.
Due to two functional layers of heat-reflecting material and inert gas-fill, an extremly high level of thermal insulation is maintained. Within the meaning of the Energy-Saving Regulation (EN 673) such glazing is indispensable. For example, with outside temperatures reaching -10°C (14°F), and room temperatures reaching +21°C (70°F), the glass on the inside is still at +19°C (67°F).
You will feel no low-temperature radiation, and you will be able to enjoy the warm and cosy space even at low outside temperatures.
Vacuum glazing Ug-value 0.3 - 0.5 W/m2K
Ug-value 0.3 - 0.5 W/m2K acc.to EN 673
Similar to heat-insulating glass, but made of 2 glass panes (each 4 mm thick) placed 1 mm apart, with 1 layer of heat-reflecting material. The two glass panes are joined in an air-tight manner, and create a vacuum. An array of almost invisible vacuum space support pillars (micro-spacers) is placed between the two panes to resist the atmospheric pressure.
Currently, vacuum glazing with U-values 0.3 – 0.5 W/m²K is available on the market. There are still considerable limitations in terms of dimensions and different glass combinations.
Ug-value / g-value
Heat permeability coefficient Ug-value (often marked as k-value) is the central physical measurement when determining heat loss when passing through a construction element. Permeability coefficient provides information on the quantity of heat passing through 1 m2 of the construction element in a unit of time, when the temperature difference between the air in the room and the air outside is 1 K (Interpane quote).
The less the Ug-value, the more efficient the heat insulation /energy saving.
g-value represents the level of total energy permeability in glazing, for solar radiation wavelengths between 300 nm and 2,500 nm. It is expressed in percentages and indicates the percentage of solar energy throughput.
The greater the g-value, the greater the use of solar energy.
