Building won't weld together

Help and Feedback Building Support
1

So recently I tried out how to weld builds together and it works for small parts like to create a wall but when I created a building with the weld and all it still somehow breaks down

I went back to ensure that it had all welds and it did but it still broke itself somehow
https://gyazo.com/3f336f7d021e30537eaf1719654eed4f
https://gyazo.com/1e239a95fa61c8bb1d9df55b964885c4

2

You have to make sure the parts are touching surface-to-surface, or you can use a WeldConstraint