topic Re: Material Intersection Priority / Composite Problem in Modeling

Material Intersection Priority / Composite Problem

jd10003 — Tue, 06 Jan 2026 00:56:17 GMT

I'm hoping y'all can help out with a wall intersection problem. I can't figure out how to get my building material interstection priorities to work in multiple situations. I've got three building materials: gypsum wallboard (green line), insulated framing (dark pink fill), and uninsulated framing (light pink fill). My insulated wall is the highest priority, uninsulated is second, and gwb is third. In the screenshot below, the T intersection on the right works the way I want it to, but the L intersection on the left won't join the gypsum wall board.

If I change the priorities so GWB is the highest priority then the L intersection on the left cleans up, but now the T intersection has the GWB running through.

The GWB is set as finish in both composites, and both versions of the framing are set as core, so I don't think that's the problem. Any ideas? What am I missing??

Re: Material Intersection Priority / Composite Problem

Barry Kelly — Tue, 06 Jan 2026 04:11:10 GMT

Your building material strengths are correct.

However, in the wall composite settings, you probably do not have the end lines turned on.

Barry.

Re: Material Intersection Priority / Composite Problem

jd10003 — Tue, 06 Jan 2026 17:42:40 GMT

Thanks Barry. Unfortunately that wasn't it. You're right I didn't have the end lines on, but turning them on doesn't seem to have an effect on whether that GWB runs through or not. This is one of those that makes me want to throw my computer out the window!

Re: Material Intersection Priority / Composite Problem

Barry Kelly — Wed, 07 Jan 2026 04:59:49 GMT

Do you have the GWB skin set as a finish?

Barry.

Re: Material Intersection Priority / Composite Problem

Laszlo Nagy — Wed, 07 Jan 2026 15:23:28 GMT

I think I found a solution to this and it may be something many people don't know about (I did not 🙂 .) But the below achieved the desired result for me:

Make sure that the Intersection Priority Number of these two Building Materials:

insulated framing (dark pink fill)

uninsulated framing (light pink fill)

are the same.

At this point, they will not cut the GWB skins, but it is up to luck which will be the stronger one.

So, select the Wall you want to be stronger (the horizontal wall), and make sure its Junction Order number is larger (e.g., 9) than that of the vertical walls (8 by default). This gave me the correct result.

Re: Material Intersection Priority / Composite Problem

jd10003 — Wed, 07 Jan 2026 17:04:58 GMT

OK yes! That did the trick!! I forgot about setting junction orders individually wall-by-wall. Thank you so much!!