And make sure your reference lines are connected.

Hi BAS
Thanks for your reply.
However I have changed, set all shown walls at one time or another
at the same time to Enable skin priorities and then a rebuild with no change in 2d view.
Notice that the wall on the top middle shows skins on.
All the walls reference lines are touching on the top as far as I can tell.
Do you see something I'm missing?
And what if you want a wall going off say to the bottom, (opposite) reference
side and have it clean up?

The key to working with Wall Composites and Complex Profiles is Skin Priority. Look over your Wall Composites in you Element Attributes. Now when you create a Complex Profile you will need to match these Skin Priorities. For example the brick skin always needs to have the same Priority. If it is 4 in one Complex Profile or Wall Composite it needs to be 4 in all the others.

Looking at your picture it looks like you have a Composite Wall with gyp on both sides and the core material all on the same Skin Priority of 8. This is incorrect. You will need core materials to be on a higher Skin Priority. A higher Skin Priority will cut through a lower Skin Priority.

You will need to check the Enable Skin Priorities setting.

Also I find it is easier to work with wall intersections if you place the reference line of a wall on the inner side of core material. You can do this by selecting your wall and going to the Design pull down menu< Modify Wall< Reference Line.

Hey Lec,

Let's see if we can sort out this mess you're in!

Firstly, the layer intersection number works as an on/off switch - they either do intersect if the LIGN is the same, or they don't. In your case you do want them to intersect so put all the walls on the same layer, or ensure the layers they are on have the same layer intersection number!

Secondly, you are experimenting with the skin priorities, so you need to have 'enable skin priorities' ticked in all walls to correctly see the effect!

Thirdly, all your walls should have the same wall priority for this exercise, so leave the wall priority for all walls at 8 for the moment.

Now all the other settings are equal, your skin priorities should behave predictably and correctly.

As Brandon has pointed out, the main problem is that your horizontal wall has the same intersection number throughout. Give the core a higher number than the 'finish' and it should work fine. Give your vertical walls the same settings and everything will join beautifully.

Try using the guide in Archibens post here as the basis for any new profiles and composites, and you'll find it should work in the majority of cases.

Good luck!

Yes, what a convoluted test subject Frankenstein I created.
At one point I thought the creation would walk out the building and the world would be doomed.
However, thanks to all who provided guidance, the doors are locked.
The creature has been contained!
But, as you might notice by my updated image all walls on the top are responding as expected. The bottom walls however, I have intentionally left the finish fills at a lower priority than the horizontal for test purposes.

But lo and behold the 6's cut through the 8's, which they should not, right?
And to address the issue of reference line touching, I intentionally ran one of the lower walls up and one wall down from horizontal wall with no apparent change in the clean up.
So what gives with that?

ps:
As I now start to analyzes where my logic went south.
I think what got me off to a wrong foot was my "assumption" or some kind of verbiage somewhere implied that skins only applied to finish, not core and then all hell broke loose!

Simple answer - Identical fills always clean up when touching!

As an exercise, try using different fills to those used on the horizontal wall. If you now play with the skin priority numbers, you can then see exactly what is happening.

To workaround this feature, you can duplicate the fill used on the outer skin and give it a different name. Use this fill on one wall and the original fill on the other. This will give you a more correct joint line in the corners, while still keeping the priority numbers the same.

The priorities system is logical but, as you have found out, ridiculously complex and results are dependant on a multitude of settings found in multiple dialog boxes. Simplification is long overdue!

Special
Thanks to:
BAS
Brandon
and
Peter

And thanks Peter for the challenges.
Ill try to get to that soon.

Brandon wrote: "I find it is easier to work with wall intersections if you place the reference line of a wall on the inner side of core material".
Do you mean sandwiched between finish and core, or do you mean actually in the core itself?
Sorry don't quite get what you mean by "inner side of core material".
ps
Design>Modify Wall> Reference line; does not work with C.P.s