Seal the gap between drywall and concrete in the garage
I am working on a project to finish my garage.
The current status is a level 2 finish by the builder and I would like to apply additional coats + paint.
Running into a problem and hope someone can shed some light -
The drywall goes off from the concrete block about 1/2'' (pictures attached). Originally, the builder just covered it with some drywall tapes. It already started to fell off due to all the moisture absorbed by the concrete.
So I peeled off the tapes and started to think of the best way to make it sealed and air-tight.
What are the options?
I am thinking about either backer-rod + dynaflex 230, or spray with thegreatstuff and trim the edge?
Could there be any other options?
Thanks a lot for your advice!