Huge gaps underneath running the length of each seem in all four corners of the room.
Are big gaps in drywall sheets a problem.
Leaving a big gap just isn t a concern.
Once dry shave it and your good to go.
If you have smaller gaps in butts and flats mesh 1st then paper tape.
Filling large gaps in sheetrock gaps 1 8 to 1 4 i usually mesh tape then paper tape.
Larger than that i would fill with easy sand 20 in a mud pan.
The mud will adhere to the drywall fill the joint holding the sheets together and the tape will be embedded inside the coat of mud strengthening the whole joint.
The solution is to fill the gaps with patching compound or if they are especially wide with strips of drywall.
The same procedure works on edges around outside corners that are too uneven to.
The gaps in the joints are even worse where the wall meets the ceiling.
Fresh drywall installations include gaps between sheets for expansion as well.
Just fill em up before you get to work taping.
Gaps 1 8 inch or wider between drywall panels can give a drywall installation an amateur appearance but gaps aren t the end of the world.