All of a sudden this morning I saw about a 14 foot "crack" on a wall facing the outside (no neighbours) and I'm freaking out. I'm sure I would have noticed it before. The fact that it probably appeared overnight worries me. Should be I concerned or is just a cosmetic problem? Background: it's a condo which is only 1.5 years old. It's been - 14 degrees to -20 for weeks if that helps. From what I can see it seems to a very superficial "crack" in the paint but I have never seen something like it. The "crack" is in a practically perfect straight line starting 2 feet below the ceiling and goes in a straight line down. and I'm used to seeing cracks that are crooked. I tried to take a picture to show but it's pretty unclear. Let me try to upload it. Is this type of crack common and what is the cause? Does it require professional help? Is the place going to crack? How do I find out the cause?