How can I fix a crack between garage wall and ceiling?

soup_sam

This white concrete wall in my garage seems to not be sealed properly against the ceiling. I noticed 2 bubbles like this and when I tore into this one, I see light through it (seems to lead to the roof venting that runs along the edge of the roof). I assume I could just fill it in and paint over it. Would that be the proper way to repair this? Does this mean that the whole seam on this wall is compromised?

Originally asked by CarCarl on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

This looks like drywall, not concrete. If it is a drywall wall and a drywall ceiling, it looks like the paper tape joint between the wall and the ceiling failed due to insufficient mud between the tape and the drywall resulting in it separating. You need to remove all the paper tape that has separated, as well as any loose bits of mud. If the wall side is not affected, you can tape just the ceiling using a method called ' flat tapping '. This would save you from having to deal with repairing the textured wall finish.

Full answer by pdd: https://diy.stackexchange.com/a/308680 (CC BY-SA 4.0).

Need it done for your business? UphillTech.