ᐅ Thermal bridge? Concrete ceiling versus surface temperature.
Created on: 28 Nov 2020 09:25
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HabneFrageH
HabneFrage28 Nov 2020 09:25Good day.
I am interested in the topic of thermal bridges (or cold bridges—are they the same?).
I measured the surface temperature of the walls and ceilings in my apartment (KfW 70 standard, Poroton blocks, 4 years old).
I noticed that one ceiling in the home office shows different surface temperatures.
This ceiling is located on the upper floor (first floor), and above it, in the attic floor, there is 50% living space (heated) and 50% unheated area (roof terrace, half covered).
The surface temperature of the ceiling is about 21°C (70°F) in the heated area.
In the unheated area, where the roof terrace is above, the ceiling temperature is only about 17°C (63°F).
Measurements were taken at about 0°C (32°F) outside temperature, with the apartment heated.
Also, the exterior walls beneath the roof terrace are colder compared to the exterior walls beneath heated rooms of adjacent apartments.
My question:
Do these temperature differences indicate the presence of thermal bridges, and could they cause long-term problems such as mold?
PS: Of course, an expert could clarify this with various measurement methods.
But first, I would like to get some tips and advice here.
Or is it normal for a ceiling located beneath a roof terrace (half covered) to be naturally colder than a ceiling beneath a heated room? That would be understandable.
However, the transition of the ceiling temperature from the warmer to about 4 degrees cooler near the exterior wall concerns me a little and interests me.
Thank you very much.
I am interested in the topic of thermal bridges (or cold bridges—are they the same?).
I measured the surface temperature of the walls and ceilings in my apartment (KfW 70 standard, Poroton blocks, 4 years old).
I noticed that one ceiling in the home office shows different surface temperatures.
This ceiling is located on the upper floor (first floor), and above it, in the attic floor, there is 50% living space (heated) and 50% unheated area (roof terrace, half covered).
The surface temperature of the ceiling is about 21°C (70°F) in the heated area.
In the unheated area, where the roof terrace is above, the ceiling temperature is only about 17°C (63°F).
Measurements were taken at about 0°C (32°F) outside temperature, with the apartment heated.
Also, the exterior walls beneath the roof terrace are colder compared to the exterior walls beneath heated rooms of adjacent apartments.
My question:
Do these temperature differences indicate the presence of thermal bridges, and could they cause long-term problems such as mold?
PS: Of course, an expert could clarify this with various measurement methods.
But first, I would like to get some tips and advice here.
Or is it normal for a ceiling located beneath a roof terrace (half covered) to be naturally colder than a ceiling beneath a heated room? That would be understandable.
However, the transition of the ceiling temperature from the warmer to about 4 degrees cooler near the exterior wall concerns me a little and interests me.
Thank you very much.
This is completely normal because transmission heat losses depend on the temperature difference between the interior and exterior (first law of thermodynamics). Therefore, these losses are logically higher in the area where the roof terrace is located than where there is an additional floor with extra energy input.
As long as you heat and ventilate properly, you have nothing to worry about (unless there are construction defects). To be absolutely sure, you can have a thermographic inspection done, but by someone knowledgeable, not just someone who bought a thermal imaging camera at an auction.
A window also loses more energy to the outside than the adjacent wall.
As long as you heat and ventilate properly, you have nothing to worry about (unless there are construction defects). To be absolutely sure, you can have a thermographic inspection done, but by someone knowledgeable, not just someone who bought a thermal imaging camera at an auction.
A window also loses more energy to the outside than the adjacent wall.
H
HabneFrage28 Nov 2020 10:12Mycraft schrieb:
This is completely normal because heat transmission losses depend on the temperature difference between inside and outside (first law of thermodynamics). Therefore, these losses are logically higher in the area where the roof terrace is located than where there is another floor above with additional energy input.
As long as you heat and ventilate properly, you have nothing to worry about. (Unless construction defects are present). To be absolutely sure, you can have a thermographic inspection done by someone experienced, not just someone who bought a thermal camera at an auction.
A window also loses more energy to the outside than the adjacent wall. Hello.
So it is completely normal (which, of course, makes sense) that the ceiling beneath an unheated space or open roof terrace is naturally colder. This is true even with sealing and insulation.
The colder wall or ceiling will not tend to develop mold if one part of the ceiling and wall is colder than another part in the same room.
Proper ventilation and heating are, however, essential for this.
H
HabneFrage28 Nov 2020 15:32Mycraft schrieb:
Yes, that's exactly right.Hello. Is it possible to specify from which temperature problems can be expected?
There is the dew point, where cold building components start to sweat, right?
For example, if the room temperature is x degrees, humidity y, and outdoor temperature z degrees. Then the ceiling or wall should not be colder than xy, correct?
Are there any data on this?
Thank you
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