Hello everyone

My first question in the forum, so I hope you understand

We are about to start building our first house, so there are many questions, but I'll start with the insulation in the sloped roof and attic space.
I recently received the construction drawings and noticed the insulation (270mm).
I have read and heard that a minimum of 300mm is preferable.
As I mentioned, I have no prior building experience and wonder if this is good or should we increase the thickness?
The house is being built in Ystad, so we don't have very cold winters.
The frame is Ytong Energo 365mm
Concrete roof tiles.
 
  • Blueprint of a house with detailed cross-section, showing insulation thickness of 270mm in the sloped roof. Construction elements and materials labeled.
What is the U-value?
 
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