Howdy nabira
I just dealt with this situation last Friday. I had repaired a ceiling that had a nasty crack going across a hallway, popcorn ceiling too...
It had turned out really nice until this Spring, I get a call to do more work there, and while checking my work from last year I notice that the crack had reappeared, not even as bad as before, but it was there...I spent a lot of time fixing it in the first place, so I was ticked...
...Then I saw what more the homeowner wanted done; It seems the panels on his 4-panel pine doors had all shrunk and split and exposed a quarter-inch of raw wood, and his jambs and baseboard caulkjoints had failed. There is a common culprit to both the crack on the ceiling and the doors; This guy had left for the winter to a sunnier clime, leaving the furnace on but neglecting the inevitable change in
humidity...As seasons change so does the moisture content in the air, and if it goes down far enough for long enough
wood will leach it's moisture content, causing shrinkage...This also applies to the studwork in the walls, causing the attached drywall or plaster-and-lathe to move with the shrinkage...
...Up here in Minnesnowta we have a normal range of 50-70% humidity in the summer (and higher
) to almost zero in the dead of winter. There are some regions where the humidity is more stable, but when you have any significant variation for prolonged periods of time it will show up in the woodwork...Including cracks in the walls....Though, if the house is newer, foundation settling can also be a cause...
So if you're in an area prone to climate changes like that, you may want to stress to your customers that they first of all get a barometer to read the moisture content in the air, then invest in a humidifier for winter and a
dehumidifier for the summer---They need to try and maintain as constant humidity in their home as possible...30-40% is optimal...
Oh, so to answer your second question, no....Because it's not my fault either...
Good luck