Cracks at intersections of drywall aren’t uncommon in new work. Yes, might be studs drying. Possibly movement or improper taping. May be installed incorrectly. Was ceiling drywall installed first, meaning the edge is atop the wall. Ask the contractor to view.

Nope, the wall drywall was in place and not touched, it was just the ceiling that was studded and drywalled to replace the dropped ceiling that was present before. As far as a fix, I guess a few more screws to prop up the problem areas, rip out old tape. retape and mud?

https://www.amazon.com/Trim-Tex-Corner-Drywall-Inside-Corners/dp/B01MYZ1SG1/ref=asc_df_B01MYZ1SG1/?tag=hyprod-20&linkCode=df0&hvadid=309770451066&hvpos=&hvnetw=g&hvrand=7607656168254481737&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9021523&hvtargid=pla-570771134061&psc=1

Here’s a tape, especially for vaulted ceiling’s, or corners where slight movement can occur.

Your photo and comment leads me to believe the ceiling drywall has been installed against, mot above, the wall panels.

Yea I believe it was installed against, thank you for the link, will look into this. You don’t think putting a few more screws to lift up the drywall in the problem areas then retape would be sufficient?

I Z, I’m not a professional so won’t guide you with a reply that I absolutely don’t know. That being said, I believe ceiling ought to be supported with the vertical of the wall. Hopefully someone will chime in or speak with a drywall installer.

That is what I was always told too. However, guess, if walls are already there, it may be impossible to get sheetrock above the walls.

IF it was mine, I would cut the wall drywall back 5/8” in order to slide ceiling atop, then mud/tape. Seems contractor took a short cut.

Use Dynaflex 230 Sealant it will never crack again and you will avoid all the mess of taping and sanding.

I’m not arguing because he’s offered a solution that may work however, the comment by GN Builders suggests a sealant. That’s basically caulk.

Our home has vaulted ceiling’s on the 2nd floor. They showed serious cracks during the new home warranty period. The builder applied some caulking to repair. It wasn’t nicely “finished”, wouldn’t hold paint and during the following winter movement caused it to tear free. Dynaflex 230 may not have those characteristics but I’d apply to a small section and wait to see.

I removed all the original tape and the caulk to retape with a corner bead for vaulted ceilings similar to the earlier link. It’s lasted over 20 years.

@fnmroberts have you also used extra screws to secure drywall to the stud a bit more ?

Of course. Nail pops are common, especially with new construction. I usually tighten a screw or set a nail, then install a new screw nearby, mud and tape.

But, simply pulling your ceiling drywall tight to the rafters may not cure your issue. Again, I’d suggest trying a small area then re-taping and watching for a season. Hopefully your studs are now dry and future movement won’t occur. I’m afraid the ultimate correction may mean getting the ceiling atop the wall drywall - doable but unfortunate.