Sweep for arch on walls

[IronHorse]

I need to make an arc sitting on two walls, this is normally no problem except in this case the walls are curved. How do I make the arc (roof) to follow the curve.
I tried Sweep with patch and guide rail, It works but do not follow the thickness of
wall exactly.

[IronHorse]

I solved the problem with lofting and guide rails :-)

[JD Mather]

I am reluctant to post this as I think your entire design is flawed - but maybe it will give you some ideas.
I suspect that what you really should do is get the "wall thickness" with a shell feature. In other words - do as a solid block and then shell.
But then I don't really know your design intent.

Looks like you solved it while I was working.

[IronHorse]

My solution is not flaw! Here is example of the final result, a part of
alumina-kiln. 550mm thick walls and arc. Assembled with bricks and mortar.

[JD Mather]

That does not match your original post.

Flaw.PNG