The picture shows the crack over a door. I'm pretty sure it has something to do with the extra load/movement in that area. What's the best way to fix this crack that will prevent this from re-occurring in the future?
Drywall – How to fix this crack in drywall
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Steven and I were typing at the same time, I've explained and elaborated a bit more FWIW. Neither of us really needs the points :)
It appears the wallboard was cut a bit too long during installation and it was forced into place, causing some pieces to spall off. In removing the spalled pieces, the paper was further torn. Ideally, you want a small gap here so any water on the concrete does not wick up into the wallboard. As long as this area does not get wet, it's nothing to worry about.
It's difficult to completely remove polyurethane foam from concrete. Scrape off as much as you can, then hit it with a wire brush mounted on a drill or angle grinder. You can level off the spalled areas with joint compound, then paint for a clean neat appearance.
Other than being unsightly, it's not really hurting anything. Remediation would be pretty low on my to do list.
Just a caulk might not fix your problem....Crack might appear next winter. You should use tape specially designed for dry wall joints it looks like this:
After that you can paint the wall. Of course, you use this tape with caulk like products, specially for this purpose (knauf-fugenfuller etc.)
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Best Answer
Put an expansion joint in the same location as the crack or remove the drywall and replace it but change the layout so there isn't a seam there. It's common to get cracks at doors like this, so when drywalling the professionals try not to put seams that close to either end of a door for that reason.
You can retape this as is with paper or mesh tape and joint compound, but the crack always comes back. If you go this route, trying not to slam this door will help the repair last longer.