I am finishing my basement and a couple of walls were put up against existing walls. There are a couple of places were there is no sufficient backing for the drywall in the corners. I assumed that in those areas, drywall clips could be used. When the drywall contractors came and put up the drywall they just hung the drywall without using any drywall clips. They told me afterwards that the clips are not strong enough anyway. They must be stronger than using nothing. Right now I can push the corners and the drywall moves. What problems will this cause later on after the walls are finished.

They haven't finished the job yet since they damaged three electrical outlets that have to be fixed. I am wondering if those corners should also be corrected.

Thanks in advance.

 

The corners should be fixed. They should install blocking or additional studs as required. Over time, the corners will crack.