Prevent lines between different wall types


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Can anyone suggest how to prevent the black lines from appearing where two different wall types are connected? The screenshot attached shows the issue.


In this property we have stone walls all round with studs and insulation (the dark yellow) on the inside, however the insulation stops before the wall shown at the bottom of the image hence why there is a different wall type being used there.


How can we prevent the black line from showing?


Version: Home Designer Pro 2021


Thanks in advance,


Annotation on 2021-12-21 at 01-04-10.png

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