Wood Roof Construction U-Values dont seem accurate when adding insulation

[pauldarling]

Hello,

I am trying to put together a wooden roof construction to use in my simulation and the U-values it’s spitting out on the other side of the decompose construction seem incorrect, I may just need another set of eyes on it.

I’ve tried one version with only an air gap in the rafters (v1) and one with extra insulation in the rafters(v2).
For some reason, the version with more insulation is giving me a higher U-value?

WoofRoof UValue Issues.gh (515.9 KB)

Please let me know if you can see the mistake or issue.

Thanks in advance.

[pauldarling]

[pauldarling]

Solved the problem. The use of window materials (25mm Wood, and the air gap) within the construction seemed to throw things off.