ᐅ Do ventilation ducts need to be insulated?

Created on: 27 Feb 2020 10:46
G
Golfi90
Hello everyone!

Our ventilation system (Zehnder) is installed in the attic.
The attic is insulated with 160mm (6 inches) of compressed mineral wool.
The ceiling below is also insulated, I believe with 240mm (9.5 inches) of compressed mineral wool.

The DN75 (3-inch) pipes running from the ventilation system to the rooms are simply laid on the roof boarding.

Do these pipes need to be insulated?

The attic is NOT heated. The rooms below, of course, are heated...

Our plumber says that the pipes do not need to be insulated.

What do you think?
Golfi9027 Feb 2020 12:02
These are standard DN75 white plastic pipes.
tomtom7927 Feb 2020 12:31
Our attic is insulated, as are the pipes. I currently estimate that at 0°C (32°F) outside temperature, the attic temperature is around 18-19°C (64-66°F). There should be no condensation forming on the pipes there.
Golfi9027 Feb 2020 13:01
Is your top floor ceiling insulated? Apparently not, otherwise why is it so warm in the attic?
seat8827 Feb 2020 13:12
I also don’t understand how you have 0°C (32°F) outside and 19°C (66°F) in the attic without heating.
Pinky030127 Feb 2020 13:23
@Golfi90 why did you insulate both the roof and the ceiling of the upper floor? Wouldn't one of them be enough?
tomtom7927 Feb 2020 13:26
seat88 schrieb:

I don’t understand either how you can have 0°C (32°F) outside and 19°C (66°F) in the attic without heating.
The roof is insulated as well, I wanted to mention that. At the same time, I was looking up the construction by Schwörerhaus but then got distracted.