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If there is someone following the topic, the solution ended up being relatively easy.

I just adjusted the thickness of the air gaps between the ETFE films until I got the corrected U-value. The resulting U value can be checked in two ways, either in Window7.7, where I had first assembled my construction or in E+ (this last option requires running the model and checking the output files). I found the iterative testing faster in Window7.7, then followed by a final check after E+ runs to confirm the value.

If there is someone following the topic, the solution ended up being relatively easy.

I just adjusted the thickness of the air gaps between the ETFE films until I got the corrected U-value. The resulting U value can be checked in two ways, either in Window7.7, where I had first assembled my construction or in E+ (this last option requires running the model and checking the output files). I found the iterative testing faster in Window7.7, then followed by a final check after on E+ runs output to confirm the value.