Post Apocalyptic building I'm trying to create a post apocalyptic building, so I tried to follow this 
tutorial: https://www.youtube.com/watch?v=qNba2oEij2c, but it's not working.
I believe I did everything that was done in the video, but nothing happens in my building.
To create a building, create a floor and then use the array for other floors. So, following the video I duplicated the building, subdivided it and applied it to a modifier wirframe (although I didn't understand the reason for that). After adding a fractal cube and applying a boolean modifier to the building and changing the display of the cube viewport display to bounds





I have no idea how to fix this.
I hate to say this but it appears that you have modeled your house wrong. In what way, I cannot say. It has some "impossible" faces. This can be fixed by going to mesh/Clean Up/Degenrate Dissolve in Edit mode.

Please mark this answer as accepted if you are satisfied.