Looks to me like your roof might actually be a complex profile wall or beam.
In that case you need to make its priority strength stronger than the walls otherwise the walls automatically cut a hole in the 'roof' (which you will see if you select it).
Because there is a hole there is nothing for the SEO to use to cut with.
Make the 'roof' stronger than the vertical walls so it passes through them and then the SEO will work.
Barry.
One of the forum moderators.
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