h82fail

Had a feeling I should have posted the plan. Mocking up a simple demo using an old simple version of my house to post; Noticed one file was doing it and another not. Identical files except one had a roof. Deleted the roof planes and framing from the one and it stopped building the funny walls when I added an addition. Auto-building a new roof over the house with an addition already in place works without funny walls. Should have known it was something with the roof, noticed auto-generating 'attic walls" in floors above those weird ones when they appeared. Edit: Alias read as "Hate to fail"

I did my best recreating my 100yr old 2 story sold brick home. Created wall types for each story: Basement is a concrete pony wall, with brick 3 courses thick above. 1st floor is a wall 3 courses thick, with interior framing and drywall surfaces 2nd floor is a wall 2 courses thick, same interior build out. Modeled on its own everything works great, and the interior frames out correctly. The problem comes in when I try to build additions, every attempt causes weird things to happen on the 1st and 2nd stories. How can I stop the new wall from changing the old? .