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 14:24
Pinky0301 schrieb:

@Golfi90 why did you insulate both the roof and the floor ceiling? Wouldn’t just one be enough?

The general contractor extended the thermal envelope up to the top floor ceiling. Since we decided fairly late to move the heating and ventilation system to the attic, we insulated the roof ourselves as an additional measure.
wrobel28 Feb 2020 07:46
Hello

The building services should be located within the insulated envelope. In this area, both supply and exhaust air ducts do not need to be insulated.
After your modifications / change requests, I would now consider this as finalized.

Olli