I have a hairline crack along a drywall corner bead next to a window. I feel like this sort of crack is probably pretty common? What causes it? How can I fix it? What steps during drywall repair / installation should be taken to prevent it?
The home is 30 years old in a pretty dry climate (Colorado).
Best Answer
This is usually due to installation error, causing outward tension across the corner and leaving too little mud burying the bead.
The bead should not be forced into position recklessly, it should be installed with just enough push to ensure an adequate coat of mud covers the flange and there is no outward tension on the flange.
For critical applications you might see a fine plasterer using a jig to help properly position the bead while fastening.