topic Re: Wall composites not clearing correctly in Documentation

Wall composites not clearing correctly

MrSoleil — Sun, 15 Feb 2026 14:50:43 GMT

Why are these not clearing correctly? The outside materials are the same, the cores should connect with the beige one on top. Priorities are set correctly (760 for the beige, 750 for the CMU, and lower for the finishes).

Betreff: Wall composites not clearing correctly

runxel — Sun, 15 Feb 2026 19:33:46 GMT

I think they are clearing up as designed – just maybe not like you'd expect. On the left there seems to be another wall, and I guess the reference lines of both horizontal walls meet, and thus joining. Even more so since the CMU has a smaller prio than the beige part.

Re: Wall composites not clearing correctly

Barry Kelly — Mon, 16 Feb 2026 01:30:09 GMT

For the walls that you want to join as a corner, try raising the value of their 'junction order'.

If they are a higher value than the other walls that are connecting, then the trimming priority should be given to them.

Barry.

Re: Wall composites not clearing correctly

MrSoleil — Mon, 16 Feb 2026 07:49:01 GMT

Thank you, but these walls do not connect to the 3rd one. Other corners with no 3rd wall behave the same. The finishes should connect - they're the same materials. But the CMU/Concrete overcomes the finishes and I've no idea how to fix that.

Re: Wall composites not clearing correctly

Barry Kelly — Mon, 16 Feb 2026 08:00:53 GMT

OK, then it is building material strengths.

The air space skin (the empty fill one) needs to be stronger than everything if you want that to trim.

And ideally the outer finish skin should be stronger that the inner skins.

At present I am guessing the beige skin is stronger than everything else.

Barry.

Re: Wall composites not clearing correctly

MrSoleil — Mon, 16 Feb 2026 12:01:54 GMT

Thank you, will try that.

Re: Wall composites not clearing correctly

MrSoleil — Tue, 17 Feb 2026 01:13:32 GMT

Works for the most part but is creating issues like these:

It boggles me how ArchiCAD has not fixed this obvious issue yet. Seems it would just require it to force clean corner finishes 🤷🏼‍♀️

Re: Wall composites not clearing correctly

Laurentiu — Mon, 16 Feb 2026 14:04:58 GMT

Try this.

Duplicate the Air building material.

Use the high priority air for the outer walls composite, and the lower priority one for the inner walls composite.

Does that work?

Re: Wall composites not clearing correctly

MrSoleil — Mon, 16 Feb 2026 14:14:33 GMT

Can't do that, these two walls need to clear at corners (the CMU + concrete), but on instances like this one they should obviously connect by core. I guess the only way would be to duplicate the wall composite, but it's unproductive.

Re: Wall composites not clearing correctly

Ernest Atanasiu — Mon, 16 Feb 2026 15:08:09 GMT

I would recommend the opposite, outer materials are lower priority always, to avoid the kind of issues MrSoleil posted.

Have you tried moving the reference line to the outside of the strongest material (the core usually) ? Refence lines should not intersect with the outside wall.

Re: Wall composites not clearing correctly

MrSoleil — Tue, 24 Feb 2026 07:52:56 GMT

Same thing is happening even if the ref line is moved to the outside of the core.

Material strengths from the outside (right/down) to inside:

- Plaster 601

- Insulation 601

- Concrete 900 / CMU 800

- Air 600

- GWB 600

Re: Wall composites not clearing correctly

MrSoleil — Tue, 24 Feb 2026 08:13:34 GMT

I did one more thing, set the CMU and the concrete materials to be 900 both.

It cleans correctly now.

I am only asking myself how does archicad know concrete should be dominant here in these connections? Will it not make the CMU "eat up" the concrete somewhere?

(as you can imagine this is critical for structural coordination)

Re: Wall composites not clearing correctly

Barry Kelly — Tue, 24 Feb 2026 08:31:18 GMT

@MrSoleil wrote:

I am only asking myself how does archicad know concrete should be dominant here in these connections? Will it not make the CMU "eat up" the concrete somewhere?

It might be controlled by the order you place the wall or maybe can be controlled by the junction order.

In this case leave them as 800 / 900 so they trim as you want, but make the outer insulation material (honey comb) stronger than 900.

It should trim to itself and stop anything passing through it.

Barry.

Re: Wall composites not clearing correctly

MrSoleil — Tue, 24 Feb 2026 18:18:51 GMT

That's not working as inverted corners get the insulation cutting through the core then.

Re: Wall composites not clearing correctly

Patrick M — Tue, 24 Feb 2026 21:49:11 GMT

"cleaning up as designed, just not as you'd like"...
how about not cleaning up as decades of architectural graphic standards require? No doubt, this is how the software is designed... but we shouldn't be complacent about sub-standard drawings that defy common graphic standards. I'm probably the least picky person in the industry when it comes to line weights. I think a set of drawings with only a .01mm pen for fills and a .2mm pen for lines is just as legible as a drawing set with 10-15 pen weights.
But if my boundary cut line is .35mm and my inner skin separator lines are .15mm, and I suddenly have .35mm injected into my assemblies, I have a software that isn't working the way it needs to be. Working the way it was designed? absolutely. Designed in a meaningful and useful way? absolutely not.

Re: Wall composites not clearing correctly

Patrick M — Tue, 24 Feb 2026 21:50:19 GMT

in your sample, have you set core/finish levels in the composite settings? that could be a starting place if bMat priorities aren't fixing it.

Re: Wall composites not clearing correctly

Laszlo Nagy — Thu, 26 Feb 2026 01:12:10 GMT

@MrSoleil wrote:

I am only asking myself how does archicad know concrete should be dominant here in these connections? Will it not make the CMU "eat up" the concrete somewhere?

This may be random in the case the Intersection Priority Number of the two Building Materials is the same.
However, you can use the Junction Order field in the Model panel of the Wall Settings Dialog to make it explicit. Just make sure the Junction Order of Wall you want to be stronger is higher than that of the other. So, let us say you want the other core to cut the concrete: just increase its Junction Order number (it is 8 by default).

Re: Wall composites not clearing correctly

MrSoleil — Thu, 26 Feb 2026 06:53:14 GMT

Thank you Laszlo, I have completely forgotten about that function.

Betreff: Wall composites not clearing correctly

Stefan L_ — Thu, 26 Feb 2026 12:57:09 GMT

... and if you need a lower Junction Order on the other end, this is the tool of choice:

/sarcasm