I'm closing this thread to stop it being necroed.
We tracking a current issue here:
https://answers.ea.com/t5/Technical-Issues-PC/CURRENT-ISSUE-Base-Game-Worlds-and-Wall-Roof-Patterns-...If you have any other issues with Sims 4 please make a new topic about the issues you are having and what kind of steps you have tried to solve it.
/Atic