Ok, so to make windows, i try the boolean modifier.i add a cube, place it in the place of window. i add a boolean modifier to the walls of the room.Then,I set the operation to difference and selected the cube. Next the cube starts clipping. like this:
I went out of the room and there i found a hole but it wasn't cutting through the wall (P.S. I do not have a solidify modifier on the room)
It was like this: I investigated more and i found that the cuefdged theroomwith I really don"t know how to say it but here it is:
I have tried everything with the normals. Flipped them inside as well as outside. Recalculated them. Applied the scale. Nothing works.
Please help I'm stuck. This has never happened before.
I am also including the .blend file.