U-Values for Wood-Aluminium Bifold Patio Doors

Thermal insulation and energy efficiency are among the most important parameters to consider before purchasing a new lift and slide door. U_w values, also known as the heat transfer co-efficient, can help when selecting a new door. The co-efficient calculates amount of heat loss through the product over a given time period. The lower the u-value, the more insulating the product.

U-Values for the IDEALU IV 68 Profile

Spruce

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 IV 68 profiles in spruce wood according to DIN EN 10077-1, see comments 1) 2) 3) 4)

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 IV 68 profiles in pine, larch, meranti according to DIN EN 10077-1, see comments 1) 2) 3) 4)

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
1.0	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 IV 68 profiles in oak, eucalyptus according to DIN EN 10077-1, see comments 1) 2) 3) 4)

IDEALU IV 68 - profile section

U-Values for the IDEALU IV 78 Profile

Spruce

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 IV 78 profiles in spruce according to DIN EN 10077-1, see comments 1) 2) 3) 4)

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 IV 78 profiles in pine, larch, meranti according to DIN EN 10077-1, see comments 1) 2) 3) 4)

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 IV 78 profiles in wood type oak, eucalyptus according to DIN EN 10077-1, see comments 1) 2) 3) 4)

IDEALU IV 78 - profile section

Reference size 3500 x 2180mm
According to DIN EN 10077-1, U_w values are shown with 2 decimal points.
Average U_f = 1.3 (W/m2K)
Uw values given in brackets are not rounded and are for informational purposes only

How Are the U-Values of a Wood-Aluminium Bifold Patio Door Calculated?

With a wood-aluminium bifold patio door, the U_w-values are calculated using the individual u-values of the window frame (U_f) and glazing (U_g). For the sake of comparison, a reference size of 3500 x 2180mm was used for the calculation. 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 wood-aluminium bifold 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 U_w-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.

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