How to remove overlapping 3d solid and surface
I think you will need a small (practically negligible) distance between the both objects. Move the roof (surface) upwards or shorten the height of the wall.
Jürgen Palme
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My first choice would be to do as @j.palmeL29YX suggests, move the roof vertically a short distance.
You could also define a UCS using points 1, 2, and 3 in the image below and the create a big box on the UCS's XY plane that covers the portion of the wall poking through the roof. Then subtract the box from the wall.
