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Windows
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French Doors
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Patio Doors
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Front Doors
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Roller Shutters
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Window Sills
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Windows
French Doors
Patio Doors
Front Doors
Roller Shutters
Window Sills
The u-value, also known as the heat transfer co-efficient is a measure of the amount of heat lost through the product over a given time period. The lower the value, the more insulating and energy-efficient the product. The u-values given below (Uw for the window, Ug for the glass, and Uf for the frame) refer to those of a test window with a single sash, 1,230 mm in width and 1,480 mm in height. The same profiles are used in our windows and French doors as in tilt and slide patio doors. As tilt and slide doors are larger than windows, their exact u-values will differ depending on the dimension.
| Glass Ug value W/(m²k) | Frame Uf value W/(m²k) | Window Uw value insulating glass edge seal aluminium W/(m²k) | Window Uw value insulating glass edge seal uPVC W/(m²k) |
|---|---|---|---|
| 1.1 | 1.1 | 1.3 | 1.3 |
| 1.0 | 1.1 | 1.3 | 1.2 |
| 0.7 | 1.1 | Not possible for this system. | Not possible for this system. |
| 0.6 | 1.1 | Not possible for this system. | Not possible for this system. |
| Glass Ug value W/(m²k) | Frame Uf value W/(m²k) | Window Uw value insulating glass edge seal aluminium W/(m²k) | Window Uw value insulating glass edge seal uPVC W/(m²k) |
|---|---|---|---|
| 1.1 | 1.2 | 1.4 | 1.3 |
| 1.0 | 1.2 | 1.3 | 1.2 |
| 0.7 | 1.2 | Not possible for this system. | Not possible for this system. |
| 0.6 | 1.2 | Not possible for this system. | Not possible for this system. |
| Glass Ug value W/(m²k) | Frame Uf value W/(m²k) | Window Uw value insulating glass edge seal aluminium W/(m²k) | Window Uw value insulating glass edge seal uPVC W/(m²k) |
|---|---|---|---|
| 1.1 | 1.5 | 1.5 | 1.4 |
| 1.0 | 1.5 | 1.4 | 1.3 |
| 0.7 | 1.5 | Not possible for this system. | Not possible for this system. |
| 0.6 | 1.5 | Not possible for this system. | Not possible for this system. |
Classic IV 68 - profile section
Rustikal IV 68 - profile section
| Glass Ug value W/(m²k) | Frame Uf value W/(m²k) | Window Uw value insulating glass edge seal aluminium W/(m²k) | Window Uw value insulating glass edge seal uPVC W/(m²k) |
|---|---|---|---|
| 1.1 | 1.1 | 1.3 | 1.2 |
| 1.0 | 1.1 | 1.2 | 1.1 |
| 0.7 | 1.1 | 1.0 | 0.9 (0.93) |
| 0.6 | 1.1 | 1.0 (0.95) | 0.9 (0.87) |
| Glass Ug value W/(m²k) | Frame Uf value W/(m²k) | Window Uw value insulating glass edge seal aluminium W/(m²k) | Window Uw value insulating glass edge seal uPVC W/(m²k) |
|---|---|---|---|
| 1.1 | 1.2 | 1.3 | 1.2 |
| 1.0 | 1.2 | 1.2 | 1.2 |
| 0.7 | 1.2 | 1.1 | 1.0 (0.97) |
| 0.6 | 1.2 | 1.0 (0.99) | 0.9 (0.91) |
| Glass Ug value W/(m²k) | Frame Uf value W/(m²k) | Window Uw value insulating glass edge seal aluminium W/(m²k) | Window Uw value insulating glass edge seal uPVC W/(m²k) |
|---|---|---|---|
| 1.1 | 1.5 | 1.4 | 1.3 |
| 1.0 | 1.5 | 1.3 | 12 |
| 0.7 | 1.5 | 1.2 | 1.1 |
| 0.6 | 1.5 | 1.1 | 1.0 |
Classic IV 78 - profile section
Rustikal IV 78 - profile section
With an wooden tilt and slide door, the Uw-values are calculated using the individual u-values of the window frame (Uf) and glazing (Ug). For the sake of comparison, a standard window size of 1230 x 1480 mm is usually used for the calculation because the profile is the same as that used for the tilt and slide patio door. The patio door's exact u-values will differ depending on its dimension.
To improve the value and insulation, a thermally separated edge warm edge seal can be added to insulating glass.
The heat transfer coefficient of a wooden tilt and slide patio door determines whether the product can be suitable for passive houses. Energy savings not only protect the environment, they can also make an immediate difference to energy bills.
The difference between a Uw-value of 3.5 W/(m²k) and 0.83 W/(m²k) can make a difference of more than 1000 litres of heating oil per year for an area of 30 m².