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Windows
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French Doors
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Windows
French Doors
Patio Doors
Front Doors
Roller Shutters
Window Sills
With their unique textures, grain patterns, and natural sturdiness, wooden windows and French balcony doors are a popular favourite for new-builds and renovations alike. Here you will find the thermal u-values of our different wooden windows and French door profiles and the different timber types that they can be made from.
Also known as the heat transfer coefficient, u-values are measured in W/(m²k) and define the amount of heat lost through the product each hour per square metre. The lower the value, the more energy-efficient the door or window and the less heat lost. Please scroll down to find the relevant u-value for the product's glazing, the Ug value, its Uf value for the frame, or the total Uw value.
| 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 | 1.2 |
| 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
On a window made of wood, the U w values are calculated using the individual U values of the window frame and glazing, as well as the heat loss at the edge of the glass. For the sake of comparison, a standard window size of 1230 x 1480 mm is usually used for the calculation, but it can generally be assumed that a larger window will result in a lower value.
A thermally separated edge seal along the insulating glass - the so-called "warm edge" - further improves the thermal insulation of the entire door.
The heat transfer coefficients of a window made of wood determine whether a window can be classified as suitable for passive houses. Energy savings not only protect the environment, they also make an immediate difference on your energy bill.
The difference between a Uw value of 3.5 and a value of 0.83 can make a difference of more than 1000 litres of heating oil per year for an area of 30 m².