How to stop an interior wall from resizing the exterior one?

[tomzak]

Hello all,

I am trying to recreate a real house in Home Designer Pro. The existing project has a complex outer wall design, where most of the wall is 30cm thick brickwork (with plaster on both sides), but there are 2 alcoves on each side of the building which are much thinner (~10cm) and built out of wood. I can model them fine for the most part with different wall types, but I run into problems when there's a corner of the thicker wall that only has 10cm of the ticker wall in use.

As soon as I connect the interior wall to the exterior one, HD forces my thick exterior wall to be shorter, and expands the thin one.

How do I prevent this from happening? 

Images here, since the forum seems to be having a problem with my attachments: https://imgur.com/a/R4SXlUS

 

[Michael_Gia]

Use invisible walls at 90° on one side to stop the joining from happening. 

[Mark3D]

Would wall material region tool help with this

[vincinlon]

Its sounds like wall connection priority issue, using Room Divider or Invisible Walls can block HD Pro from forcing unwanted wall merges at corners. You can also manually define wall layers using the Wall Layer Intersection tool to keep those structural zones intact. I ran into this while modeling a stone farmhouse with timber-framed sections; splitting walls by material and using breaks at transition points totally fixed the resizing issue. Best of luck.

[tomzak]

Thank you for all the answers! I found a solution in the end - invisible walls didn't do the trick, but diving the exterior wall along the line of the connecting interior wall did it. Now HD loves to automatically rebuild those walls if I change anything later (for example change the material of the walls for a different look), but I generally can recover from it with the same method.

 

I would love an option to completely disable automatic wall rebuilds - it feels like it's more in my way than helping me.