topic Re: Inconsistent Wall Intersections – Same Walls, Different Behavior in Modeling

Inconsistent Wall Intersections – Same Walls, Different Behavior

Heftor — Fri, 21 Aug 2026 07:46:17 GMT

Hi everyone,

I'm running into a strange wall intersection issue and hoping someone can point me in the right direction.

I have three walls intersecting at two different locations:

Wall A (Concrete): 0 cm to 13.5 cm high (thinner than the other two)
Wall B (Plastic): 19 cm to 241 cm high
Wall C (Drywall): 0 cm to 316 cm high

At one intersection, everything works as expected – the drywall stops cleanly at the plastic wall.

However, at the other intersection, the drywall ignores the plastic wall and continues through to connect with the Concrete wall instead.

Both intersections involve the exact same three wall types and heights, yet they behave completely differently.

What I've already checked:

All walls have the same renovation status.
Building Material Priorities are the same.
"Use legacy intersection method" is disabled.
All walls in the same layer.
Same reference lines positions

Has anyone seen this kind of inconsistent behavior? Are there specific settings or commands I should look at to force the drywall to consistently stop at the plastic wall?

Any advice would be greatly appreciated.

Thanks in advance!

Operating system used: Windows

Re: Inconsistent Wall Intersections – Same Walls, Different Behavior

Lingwisyer — Fri, 21 Aug 2026 07:57:27 GMT

Do they all have the same Junction Order?

Betreff: Inconsistent Wall Intersections – Same Walls, Different Behavior

runxel — Fri, 21 Aug 2026 09:55:57 GMT

Without "Clean Wall Intersections" being on the screenshots are not really that much informative.

Re: Inconsistent Wall Intersections – Same Walls, Different Behavior

Barry Kelly — Fri, 21 Aug 2026 11:58:44 GMT

It is strange that the reference lines are correct.

It could be the junction order as Ling suggests.

I am suspecting a wall in a hidden layer maybe?

Barry.

Betreff: Inconsistent Wall Intersections – Same Walls, Different Behavior

Heftor — Mon, 24 Aug 2026 07:48:27 GMT

Hi Runxel,

Here you have the connection without Clean Wall Intersections:

Re: Inconsistent Wall Intersections – Same Walls, Different Behavior

Heftor — Mon, 24 Aug 2026 07:51:49 GMT

Hi Ling,

I have checked the Junction Order and this are the numbers:

both intersections have the same Junction order values.

Thanks for helping.

Re: Inconsistent Wall Intersections – Same Walls, Different Behavior

Heftor — Mon, 24 Aug 2026 07:55:54 GMT

Hi Ling,

I have checked the Junction Order and this are the numbers:

Walls in both intersections have the same Junction order values but the result is different.

Thanks for helping.

Re: Inconsistent Wall Intersections – Same Walls, Different Behavior

Heftor — Mon, 24 Aug 2026 07:55:08 GMT

This is the junction order:

and this is the screenshot with displaying all layers, and both intersections are isolated in a different place in the model:

Thanks for the help, Barry

Betreff: Inconsistent Wall Intersections – Same Walls, Different Behavior

runxel — Mon, 24 Aug 2026 09:07:27 GMT

Thanks, @Heftor.

Since the reference lines of the drywall and the small wall on top of the concrete wall are not touching each other, the small wall can not contribute to the intersection. Why you happen to manage it in one case: I don't know, I can't. In my test it always look like this

However if I prolong the drywall's ref line so the meet up:

Then it looks just fine.

Betreff: Inconsistent Wall Intersections – Same Walls, Different Behavior

Stefan L_ — Wed, 26 Aug 2026 11:49:28 GMT

Maybe some inaccuracy?

@Heftor would you mind following my 'precise' instructions?