All statements without guarantee

Perete Exterior Folie Exterior wall

created on 15.12.2021

Thermal protection Moisture proofing Heat protection

No condensate Temperature amplitude damping: >100
U = 0,18 W/(m²K) phase shift: non relevant
Thermal capacity inside: 195 kJ/m²K
GEG 2020 Bestand*: U<0,24 W/(m²K)

excellent insufficient excellent insufficient excellent insufficient

outside
10 5

150 4

3
420,5

250 www.ubakus.de
2

Commercial use only with Plus-, PDF- or Profi-Option (from 2.99 € / month plus VAT).
10 1
inside
1 Lime cement plaster (10 mm) 4 Extruded polystyrene (150 mm)
2 Porotherm 25-38 N+F Wienerberger (250 mm) 5 Cement plaster (10 mm)
3 Vapor barrier sd=100m

Impact of each layer and comparison to reference values

For the following figure, the thermal resistances of the individual layers were converted in millimeters insulation. The scale
refers to an insulation of thermal conductivity 0,035 W/mK.

Porotherm 25-38 N+F Wienerberger Equivalent

insulation thickness
Extruded polystyrene (XPS 035) (WLS 035)

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 mm
8 i
0 95 eT
u
ba =0,2 d
5
=0
,1
41 O ig u U
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En 20 EV Neu V U . =0
G n
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Inside air : 20,0°C / 60% Thickness: 42,0 cm

Outside air: -15,0°C / 80% sd-value: 131,7 m Weight: 243 kg/m²
Surface temperature.: 18,4°C / -14,7°C Heat capacity: 245 kJ/m²K

*Vergleich mit dem Höchstwert gemäß GEG 2020 für erstmaligen Einbau, Ersatz oder Erneuerung von Außenwänden (Anlage 7, Zeile 1a,1b). Page 1
 All statements without guarantee

Perete Exterior Folie, U=0,18 W/(m²K)

Temperature profile
Temperature profile
20 Temperature
1 2 3 4 5 Dew point
15

10 1 Lime cement plaster (10 mm)

Temperature [°C]

5 2 Porotherm 25-38 N+F Wienerberger (250 mm)

3 Vapor barrier sd=100m
0 4 Extruded polystyrene (150 mm)
5 Cement plaster (10 mm)
-5

-10

-15

0 50 100 150 200 250 300 350 400 450

Inside 0°C [mm]

Commercial use only with Plus-, PDF- or Profi-Option (from 2.99 € / month plus VAT).
www.ubakus.de Outside

Temperature and dew-point temperature in the component. The dew-point indicates the temperature, at which water vapour
condensates. As long as the temperature of the component is everywhere above the dew-point temperature, no
condensation occurs. If the curves have contact, condensation occurs at the corresponding position.

Layers (from inside to outside)

# Material λ R Temperatur [°C] Weight
[W/mK] [m²K/W] min max [kg/m²]
Thermal contact resistance* 0,130 18,4 20,0
1 1 cm
Lime cement plaster 1,000 0,010 18,4 18,4 18,0
2 25 cm
Porotherm 25-38 N+F Wienerberger 0,259 0,965 12,3 18,4 199,5
3 0,05 cm
Vapor barrier sd=100m 0,220 0,002 12,3 12,3 0,1
4 15 cm
Extruded polystyrene (XPS 035) 0,035 4,286 -14,7 12,3 5,3
5 1 cm
Cement plaster 1,400 0,007 -14,7 -14,7 20,0
Thermal contact resistance* 0,040 -15,0 -14,7
42,05 cm Whole component 5,440 242,9
*Thermal contact resistances according to DIN 6946 for the U-value calculation. Rsi=0,25 and Rse=0,04 according to DIN
4108-3 were used for moisture proofing and temperature profile.

Surface temperature inside (min / average / max): 18,4°C 18,4°C 18,4°C

Surface temperature outside (min / average / max): -14,7°C -14,7°C -14,7°C

Page 2
 All statements without guarantee

Perete Exterior Folie, U=0,18 W/(m²K)

Moisture proofing
For the calculation of the amount of condensation water, the component was exposed to the following constant climate for
90 days: inside: 20°C und 60% Humidity; outside: -15°C und 80% Humidity (Climate according to user input).
This component is free of condensate under the given climate conditions.

# Material sd-value Condensate Weight

[m] [kg/m²] [Gew.-%] [kg/m²]
1 1 cm Lime cement plaster 0,15 - 18,0
2 25 cm Porotherm 25-38 N+F Wienerberger 1,25 - 199,5
3 0,05 cm Vapor barrier sd=100m 100,00 - 0,1
4 15 cm Extruded polystyrene (XPS 035) 30,00 - 5,3
5 1 cm Cement plaster 0,35 - 20,0
42,05 cm Whole component 131,75 242,9

Humidity
The temperature of the inside surface is 18,4 °C leading to a relative humidity on the surface of 66%.Mould formation is not

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expected under these conditions.
The following figure shows the relative humidity inside the component.

100 Relative humidity (%)

1 2 3 4 5 saturation point
90
80
Relative humidity (%)

1 Lime cement plaster (10 mm)

70
2 Porotherm 25-38 N+F Wienerberger (250 mm)
60
3 Vapor barrier sd=100m
50 4 Extruded polystyrene (150 mm)
40 5 Cement plaster (10 mm)
30
20
10
0
0 50 100 150 200 250 300 350 400 450
Inside 0°C [mm]
www.ubakus.de Outside
Notes: Calculation using the Ubakus 2D-FE method. Convection and the capillarity of the building materials
were not considered. The drying time may take longer under unfavorable conditions (shading, damp / cool
summers) than calculated here.

Page 3
 All statements without guarantee

Perete Exterior Folie, U=0,18 W/(m²K)

Heat protection
The following results are properties of the tested component alone and do not make any statement about the heat protection
of the entire room:

Temperature profile
This document has been generated by the U-value calculator on www.ubakus.de. If you are harmed by the free use of these contents, the service provider is only liable in case of

36 Temperature at 3pm, 11am and 7am

34 1 2 3 4 5 Temperature at 7pm, 11pm and 3am
intent and gross negligence on the part of the service provider. For further information, please refer to the terms and conditions at https://www.ubakus.de/agb

32
30 1 Lime cement plaster (10 mm)
Temperature [°C]

28 2 Porotherm 25-38 N+F Wienerberger (250 mm)

26 3 Vapor barrier sd=100m
24 4 Extruded polystyrene (150 mm)
5 Cement plaster (10 mm)
22
20
18

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16
14
0 50 100 150 200 250 300 350 400 450
Inside [mm]
www.ubakus.de Outside

[°C] The surface temperature during the day

36 Outside
34 Inside
32
30
28
26
24
22
20
18
16
14 Phase shift: 15.2h
12 14 16 18 20 22 24 2 4 6 8 10 12
[time of day]
Top:Temperature profile within the component at different times. From top to bottom, brown lines: at 3 pm, 11 am and 7 am
and red lines at 7 pm , 11 pm and 3 am.
Bottom:Temperature on the outer ( red ) and inner ( blue ) surface in the course of a day. The arrows indicate the location of
the temperature maximum values . The maximum of the inner surface temperature should preferably occur during the
second half of the night.

Phase shift* non relevant Heat storage capacity (whole component): 245 kJ/m²K
Amplitude attenuation ** >100 Thermal capacity of inner layers: 195 kJ/m²K
TAV *** 0,006
* The phase shift is the time in hours after which the temperature peak of the afternoon reaches the component interior.
** The amplitude attenuation describes the attenuation of the temperature wave when passing through the component. A value of 10
means that the temperature on the outside varies 10x stronger than on the inside, e.g. outside 15-35 °C, inside 24-26 °C.
*** The temperature amplitude ratio TAV is the reciprocal of the attenuation: TAV = 1 / amplitude attenuation
Note: The heat protection of a room is influenced by several factors, but essentially by the direct solar radiation through windows and the
total amount of heat storage capacity (including floor, interior walls and furniture). A single component usually has only a very small
influence on the heat protection of the room.

Page 4

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