Wood-alu windows and French doors u-values

With their strong weather-resistant shell and charming textured timber interiors, wood-alu windows and French doors are a popular choice for renovations and new-builds alike. To find out more about their functional properties and performance in detail, here you will find information about the thermal u-values for each product model and the type of wood it will be made from.

Measured in W/(m²k), the u-value, also known as the heat transfer coefficient, defines the amount of heat lost through the product each hour per square metre. The lower the value, the better, as less energy is lost. We have included data on the U_g value for the glass, U_f value for the frame as well as the total U_w value with different sealing options.

Uw value profiles IDEALU Classicline IV 68 and IDEALU Trendline IV 68

Spruce wood

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.1	1.3	1.2
1.0	1.1	1.2	1.2
0.7	1.1	1.0	1.0 (0.95)
0.6	1.1	1.0 (0.97)	0.9 (0.89)

Table of Uw values for IDEALU Classicline IV 68 and IDEALU Trendline IV 68 profiles in spruce wood according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types pine, larch, meranti

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.2	1.3	1.3
1.0	1.2	1.3	1.2
0.7	1.2	1.1	1.0 (0.99)
0.6	1.2	1.0	0.9 (0.93)

Table of Uw values for IDEALU Classicline IV 68 and IDEALU Trendline IV 68 profiles in wood types pine, larch, Meranti according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types oak, eucalyptus

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.5	1.4	1.4
1.0	1.5	1.4	1.3
0.7	1.5	1.2	1.1
0.6	1.5	1.1	1.0

Table of Uw values for IDEALU Classicline IV 68 and IDEALU Trendline IV 68 profiles in wood types oak, eucalyptus according to DIN EN 10077-1, see comments 1) 2) 3)

IDEALU Classicline IV 68 – profile section

IDEALU Trendline IV 68 - profile section

Uw value profiles IDEALU Classicline IV 78 and IDEALU Trendline IV 78

Spruce wood

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w 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)

Table of Uw values for IDEALU Classicline IV 78 and IDEALU Trendline IV 78 profiles in spruce wood according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types pine, larch, meranti

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.2	1.3	1.2
1.0	1.2	1.3	1.2
0.7	1.2	1.1	1.0 (0.97)
0.6	1.2	1.0 (0.99)	0.9 (0.91)

Table of Uw values for IDEALU Classicline IV 78 and IDEALU Trendline IV 78 profiles in wood types pine, larch, Meranti according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types oak, eucalyptus

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.5	1.4	1.3
1.0	1.5	1.3	1.3
0.7	1.5	1.2	1.1
0.6	1.5	1.1	1.0

Table of Uw values for IDEALU Classicline IV 78 and IDEALU Trendline IV 78 profiles in wood types oak, eucalyptus according to DIN EN 10077-1, see comments 1) 2) 3)

IDEALU Classicline IV 78 - profile section

IDEALU Trendline IV 78 - profile section

Uw value profile IDEAL PLANO

Spruce wood

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.1	Not possible for this system.	Not possible for this system.
1.0	1.1	Not possible for this system.	Not possible for this system.
0.7	1.1	1.0	1.0 (0.95)
0.6	1.1	1.0 (0.97)	0.9 (0.88)

Table of Uw values for IDEAL PLANO profiles in spruce wood according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types pine, larch, meranti

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.2	Not possible for this system.	Not possible for this system.
1.0	1.2	Not possible for this system.	Not possible for this system.
0.7	1.2	1.1	1.0 (0.99)
0.6	1.2	1.0	0.9 (0.92)

Table of Uw values for IDEAL PLANO profiles in wood types pine, larch, Meranti according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types oak, eucalyptus

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.5	Not possible for this system.	Not possible for this system.
1.0	1.5	Not possible for this system.	Not possible for this system.
0.7	1.5	1.2	1.1
0.6	1.5	1.1	1.0

Table of Uw values for IDEAL PLANO profiles in wood types oak, eucalyptus according to DIN EN 10077-1, see comments 1) 2) 3)

IDEAL PLANO - profile section

Uw value profiles ECO IDEALU Classicline and ECO IDEALU Trendline

Spruce wood

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	0.9 (0.92)	Not possible for this system.	Not possible for this system.
1.0	0.9 (0.92)	Not possible for this system.	Not possible for this system.
0.7	0.9 (0.92)	1.0 (0.96)	0.9 (0.87)
0.6	0.9 (0.92)	0.9 (0.89)	0.8 (0.81)

Table of Uw values for ECO IDEALU Classicline and ECO IDEALU Trendline profiles in spruce wood according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types pine, larch

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.0	Not possible for this system.	Not possible for this system.
1.0	1.0	Not possible for this system.	Not possible for this system.
0.7	1.0	1.0 (0.98)	0.9
0.6	1.0	0.9 (0.91)	0.8 (0.83)

Table of Uw values for ECO IDEALU Classicline and ECO IDEALU Trendline profiles in wood type pine, larch according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types oak, eucalyptus

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.1	Not possible for this system.	Not possible for this system.
1.0	1.1	Not possible for this system.	Not possible for this system.
0.7	1.1	1.0	1.0 (0.95)
0.6	1.1	1.0 (0.96)	0.9 (0.88)

Uw value table for ECO IDEALU Classicline and ECO IDEALU Trendline profiles in wood type oak, eucalyptus according to DIN EN 10077-1, see comments 1) 2) 3)

ECO IDEALU Classicline - profile section

ECO IDEALU Trendline - profile section

Uw value profile IDEAL ECO PLANO

Spruce wood

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	0.9 (0.92)	Not possible for this system.	Not possible for this system.
1.0	0.9 (0.92)	Not possible for this system.	Not possible for this system.
0.7	0.9 (0.92)	1.0 (0.96)	0.9 (0.87)
0.6	0.9 (0.92)	0.9 (0.89)	0.8 (0.81)

Table of Uw values for IDEAL ECO Plano profiles in wood type spruce according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types pine, larch

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.0	Not possible for this system.	Not possible for this system.
1.0	1.0	Not possible for this system.	Not possible for this system.
0.7	1.0	1.0 (0.98)	0.9 (0.89)
0.6	1.0	0.9 (0.91)	0.8 (0.83)

Table of Uw values for IDEAL ECO PLANO profiles in wood type pine, larch according to DIN EN 10077-1, see comments 1) 2) 3)

Wood types oak, eucalyptus

Glass U_g value W/(m²k)	Frame U_f value W/(m²k)	Window U_w value insulating glass edge seal aluminium W/(m²k)	Window U_w value insulating glass edge seal uPVC W/(m²k)
1.1	1.1	Not possible for this system.	Not possible for this system.
1.0	1.1	Not possible for this system.	Not possible for this system.
0.7	1.1	1.0	0.9 (0.94)
0.6	1.1	1.0 (0.96)	0.9 (0.87)

Table of Uw values for IDEAL ECO PLANO profiles in wood type oak, eucalyptus according to DIN EN 10077-1, see comments 1) 2) 3)

IDEAL ECO PLANO - profile section

Windows with a heat transfer coefficient of U_g < 1.9 W/m²K for the glazing may always be specified with the standard dimensions of 1.23 m x 1.48 m.
According to DIN EN 10077-1, Uw values < 1.0 W/m²K are shown with 2 decimal points.
The U_w values given in brackets are not rounded and are for information purposes only.

How is the Uw value of a wood-aluminium window calculated?

With a window made of wood and aluminium, the Uw values are calculated based on 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 and aluminium 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.

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