ᐅ Cold Roof – Are Roof Windows Necessary for Cross Ventilation?

Jochen104 schrieb:
In our case, the top floor ceiling is also insulated, and the eaves and ridge have ventilation grilles.

This is a classic ventilated cold roof.

A roof that is insulated between the rafters and has a ventilation layer above the insulation and below the roof covering is also considered a cold roof. For cold roofs, proper ventilation is crucial because it serves as a structural measure to protect the timber. Without correct ventilation, the roof structure will rot, regardless of whether the insulation layer is located at the top floor ceiling or between the rafters.

Warm roofs are never ventilated and require a vapor barrier to prevent damage to the roof structure.

In a ventilated cold roof, windows in the roof structure/attic are unnecessary. Ventilation must work without windows.

The question arises again about the qualifications of self-proclaimed building consultants. It is not a protected term, and even pizza chefs can call themselves building consultants.

Oh, I am just an amateur sharing my experience with my own planning – and naturally, this was also discussed with the architect/roofer, etc.

We also have a vapor retarder with a variable SD value ranging from 0.25 to 25 m (0.82 to 82 ft).

Oh, all the way up to the ridge? Then ventilation doesn’t really matter... if it has been done properly.

No – only the roof slopes and the intermediate ceiling. You mean we need to ensure that air circulates there to prevent damage to the rafters? (there’s nothing more than that)