ᐅ Install ventilation ducts for the controlled residential ventilation system through the sloped roof ceiling.

Hello,

the heating engineer has installed the supply and exhaust ventilation pipes through the sloping roof beneath the vapour barrier membrane. Although this will still be insulated and covered by the drywall, is this acceptable or could it cause a thermal bridge or create a potential weak spot for mold growth in the pipes?

In our house, the fresh air supply was routed through the roof peak in the attic (everything around it was insulated), and now we have a problem with condensation forming around the duct. Everything needs to be redone, and the fresh air supply will now come through the exterior wall. Each supply and exhaust duct of the mechanical ventilation system is in the sloped roof area, and so far there have been no problems there. We have only been living in the house since the end of November.

vanny2705 schrieb:

In our house, the fresh air supply was routed through the ridge in the attic (everything around it insulated), and now we have a problem with condensation forming around the duct. Everything has to be redone, and the fresh air supply is now coming through the exterior wall... There is one supply and one exhaust duct for the mechanical ventilation system in the sloped ceiling, and so far there have been no problems there.
We’ve only been living in the house since the end of November.

So, do you now also have the ducts installed in the sloped ceiling?

I have two recent pictures here to help visualize the setup better!

Is this okay?

How much continuous insulation do you have above the rafters?
Is the central mechanical ventilation system installed in the attic?

RotorMotor schrieb:

How much insulation do you have above the rafters?
Is the central mechanical ventilation system installed in the attic?

20 cm (8 inches) of insulation between the rafters with a thermal conductivity class of 035, and the mechanical ventilation system is located in the basement in the utility room with intake and exhaust vents on the exterior wall near the top of the basement wall.

Why is this entire bundle laid out along the roof when the system is installed in the basement?
If there is no exterior insulation above the rafters (also called "counter batten insulation"), the pipes are almost directly against the building envelope.
That doesn’t sound good to me at all!