Gaps in the Ceiling Joint with Crown Moulding
From contributor L:
My guess would be that it is wood crown mould. Wood shrinks against the length, whereas MDF mouldings shrink with the length. One good thing you can do at the time of installation is use 16p finish nails to slightly convex the crown. Then when it shrinks it will still be on the wall.
From contributor M:
It is probably the roof trusses lifting in the winter. It will more than likely close up in warmer weather.
From contributor K:
Was it at the exterior or interior wall or both?
From the original questioner:
It is both interior and exterior walls.
From contributor K:
Then the guys who installed the sheetrock put a fastener within 18" of the wall on the ceiling (or used glue on the ceiling), which is causing the movement. The only way to correct that is to remove the fastener. That's not going to happen, so your only solution at this point is caulk/repaint. I mean, I guess you could go up into the attic and use a Fein Multimaster to cut the fastener from the truss (assuming you could find it), but chalk this one up to some caulk/paint and explain to the homeowner.
When we install crown on homes post-1990, we glue the top part of the crown only so it attaches with the ceiling and run caulk on the wall. Takes a lot longer for any cracks to appear and when they do they are only hairline to a max of 1/16" and people are usually ready to repaint by then. Make sure you cope the corners, though, or you will end up with cracks in the corners.
From Gary Katz, forum technical advisor:
Contributor K, excellent advice!
From contributor B:
You can use a magnet to find the fastener and remove it by backing it out if the sheetrock has been screwed, or drive it in all the way with a nail set if it's been nailed. Then you only have a very small hole to patch and touch up the paint. I often do this on the initial install when I see a somewhat sizeable gap between the ceiling and the crown.
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