I am trying to install ceiling drywall and everything is fine until I reach the edge.
You can see there are 3 2x8 joists at the edge and it's somehow positioned 1/2" to 1" lower than the rest. So my drywall basically flush to the bottom of the 2x8 lumbers.
My questions are:
Is it OK to just putting drywall compound and paper and sand this 6" area? I think it will terribly crack later due to wood vs. drywall movement.
If not, how best to cover this area and make it smooth with the rest of the ceiling without having to use any trim/moulding?
Here is another photo at the corner where the joist lumber is almost 1/2" lower:
Could I use Floor Ram Board such as https://www.homedepot.com/p/Ram-Board-38-in-x-50-ft-Temporary-Floor-Protection-Roll-RB-38x50/202823781 to nail and create a smooth transition?
Could I use 1/4" plywood with 3 feet width and mount as in the green area below? Then I can slowly mud the 1/4" thickness difference to spread for maybe 1-2 feet more.
Would "Rock Hard Water Putty" (https://www.walmart.com/ip/Rock-Hard-1-Water-Putty-1-lb-Cream-Powder/23217846) work to fill the gap and not use anything else? I have tried this before and it's as hard as wood once dried.