[graciegirl]

Originally Posted by rustyp

Drywall is tapered at the edges. This creates a valley so that you don't end up with a bump when you fill in the crack where the sheets butt together. To do a quality job I.E. no bump you need to use a technique called a rock splice to strengthen a non supported seam. Quality builders do this all the time especially with long seams like in a Lanai. The local big box stores sell these splices.

One of the difficulties of the repair of these cracks due to temperature changes is that the finish of our ceilings are not easily duplicated and it shows when they have been repaired because they are bumpy...in a pattern and any attempt to repair it becomes another pattern or smooth and stands out.