Questions about converting walls to roofs

I am currently conducting a study on the energy consumption of various roof types.
Among them, there is a problem with tunnel roofs.
A room was created by splitting a surface into multiple planes as follows.
And I want to set the walls at both ends as roofs, but I can’t.
So I carefully ask if there are any alternatives. (34.2 KB)

Hi @imj06050215

yoy can change the maximum roofangle.

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Hi @Erikbeeren

you’ve been very helpful.
Thanks to you, my research is progressing smoothly.