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If the measuring unit indicates an air temperature of 20° C and a
relative humidity of 65%, then the dew-point temperature will be
13.2° C. What does that mean? That the air, for instance in your
bedroom, will condense and form water droplets at all points on
walls and ceilings that are cooler than 13.2° C, and that this may
later lead to patches of mould or damp.
If the air is at a relative humidity of say 40%, then the dew-point
temperature is only 6 °C. The walls and ceilings would therefore
have to be significantly colder for the air to reach its dew-point and
for water droplets to form.
Dew point table
Temperature
room air °C
30
25
20
15
10
How to achieve the correct temperature
and air humidity:
Tips for active heating and ventilation:
• Check the dew-point! Surfaces of walls should not fall below a
temperature of 15° C!
• Do not turn the heating completely off when going out.
• Ventilate in all weather conditions, even if it's raining.
• Open the windows for a short time (room airing). A partially open
window, for instance in the tilted position, does not have the desi-
red effect, wastes heating energy and can even promote the for-
mation of mould.
12
Dew point temperature in °C
relative air humidity in %
30% 40% 50% 60% 65% 70% 80% 90%
10.5 14.9 18.4 21.4 22.7 23.9 26.2 28.2
6.2
10.5 13.9 16.7 18.0 19.1 21.3 23.2
1.9
6.0
-2.2
1.5
-6.0
2.6
-
9.3
12.0 13.2 14.4 16.4 18.3
4.7
7.3
8.5
0.1
2.6
3.7
9.6
11.6 13.4
4.8
6.7
8.4
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