What you can barely see here is a long horizontal crack in the plaster. Regularly not a problem, but here the plaster had separated from the lath and a patch would have fallen out over time. Thank Al Gore for the internet... and Ask This Old House.
Step 1, drill a bunch of holes into the plaster along the crack. About 85 in this case.
Step 1, drill a bunch of holes into the plaster along the crack. About 85 in this case.
Step 2, fill every other hold with adhesive.
Step 3, add a washer and drywall screw to the holes without adhesive.
Step 4, tighten the screws down and let adhesive cure.
Step 5, remove the screws and washers then to what is by now a familiar chore, filling and sanding the holes.
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