After all the loose plaster was knocked out, and loose plaster vaccumed out of the gaping wide space with a shop vac, the joints were ready to be repaired.
To repair a damaged joint seam this large, Please DO NOT attempt to just slop in some mud and call it a day.
For this type of repair it is crucial that you create a new secure joint between the ceiling and the wall.
I have found the best way, and possibly the only way to do this is to use drywall tape created just for that purpose of joining two pieces of drywall together using sheetrock.
My method is to apply a skim coat of mud to a long strip of drywall tape. Then, carefully line up the seam and smooth into place using a putty knife, making sure all the air bubbles and creases are smooth. Then, once the tape is secured in place, I neatly apply a generous amount of mud over the tape, smoothing it out and shaping it until the seam is completely covered. I continue to do this all along the ceiling, each time lining up the seams, and coating with mud until all the damaged areas are covered. I allow this to dry generally 24-48 hours.
The result will be an extremly rock solid new joint seam ready to be sanded smooth. (Beware, there is a lot of dust when sanding this amount of sheetrock.)
After sanding the joint seams, you may notice a few small holes here or there. Simply fill those in carefully with spackling compound and allow to dry.
When everything is dry and sanded smooth, you've created a brand new joint seam!
To be continued...
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