Stack ventilation insulation unheated roof

Hello everyone,

what is the best way to insulate the bathroom vent pipe in the uninsulated area of the roof to avoid condensation?

Does only the area of the HT pipe need to be insulated or also the flexible hose connected to the roof tile? So basically the entire area from the vapor barrier on the top floor ceiling to the underlay membrane, or only the area from the vapor barrier to the beginning of the flexible hose.

Thank you very much

Regards

Sky

Hi

I wouldn't insulate the vent pipe at all.
The warm and humid air in the pipe will just condense and run off along with the wastewater.
There will be no condensation on the outside of the pipe.

Olli

According to the contractor, the pipes must be insulated. I am just left wondering with what