ᐅ Insulating a pitched roof, thermal bridge? Drywall boards with insulation layer

Hello,
I am currently insulating my roof.
The roof is covered, and an underlay membrane is installed.
Now I am working on attaching 32mm (1.3 inches) compressed insulation between the 200mm (8 inches) rafters and stapling a vapor barrier.
My question is: With 200mm (8 inches) rafters, is it necessary to add an additional insulation layer (using 24mm (1 inch) battens) between the counter battens for the drywall, or can the thermal bridge created by the rafters be considered negligible?

Best regards,
Christoph

Hello,

chris81 schrieb:
With 200mm (8 inches) rafters, is it necessary to install an additional insulation layer (24mm (1 inch) battens) between the support battens for the drywall panels, or can the thermal bridge caused by the rafters be neglected?

Let me answer the question this way: I would do it, specifically to reduce the thermal bridging. But if you decide not to, nothing bad will happen either 😉

Best regards

I would install 180mm (7 inches) of insulation and continue to completely ignore the rafters.

E.Curb schrieb:
I would do it, specifically to minimize thermal bridging. But if you skip it, nothing will happen

Well, thermal bridges really should be avoided.

...When installing the vapor retarder, it is important to ensure that all connections and joints to the roof structure are sealed against wind and air infiltration, so that no thermal bridges develop which could allow cold air to enter or warm air to escape later on. If the building physics of the roof are properly observed, the lifespan of the roof will automatically increase. It is therefore worthwhile to invest a bit more in the quality of materials to avoid future complaints and problems.

Hello,

ddtorsten schrieb:

...When installing the vapor barrier, it is important to ensure that all connections and joints to the roof structure are sealed to be windproof and airtight, preventing thermal bridges through which cold air can enter later, or warm air can escape to the outside. Paying attention to the proper building physics of the roof automatically increases its lifespan.

I can fully agree with that.

Best regards