So I recently purchased this home and moved in about four months ago. These cracks have been showing up and slowly spreading. I don't remember them being present during inspection or during walk through and moving in.
Ceiling – causing these ceiling cracks
ceilingcrack
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Best Answer
There is a very good chance that these cracks were covered up before you bought the house. From the general looks of it, they look cosmetic.
What is causing them is the change in temperature of the attic.
Now the co-conspirators here could also be a little moisture (I am doubting the venting of bathrooms are the culprits on that front), could be bad tape job, and I am going to guess the biggest is that extra weight.
I am going to guess you have a standard attic with joists either 18 or 24" spaced. I am going to guess that they put a pad down for the HVAC but the rest of the attic has no subfloor. It is this subfloor that helps bind and disperse weight through the joist system causing less variance during seasonal movements. Me thinks these cracks started appearing 7 years ago and they basically ignored them before. Looking at your pictures and I would need better ones but looks like there are perpendicular mud or paint strokes by the cracks (should have been taped).
So what can you do?
Or you can just look at your cracks because it is just drywall. You have to understand this isn't a huge deal, you need more information to fix it right and quite frankly to fix it right might cost a bit and I doubt someone will give you a 100% warranty the cracks won't somewhat reappear.