At the first sign of sagging, it's best to repair a plaster ceiling. If there is more than 1/2 inch of room between the lath and the plaster, or if you hear crunching sounds, then it's best to replace it. Avoid procrastination or your may end up with a room full of plaster dust. The repair isn't that difficult and will create a durable bond to last quite awhile.
Instructions
1. Drill injection holes every 3 to 4 inches into the ceiling hitting the lath -- but not drilling into the lath. Wear safety goggles to protect your eyes.
2. Vacuum debris with a shop-vac.
3. Squirt some water into the holes to soften the plaster and wet the lath. This will prepare for a strong adhesive bond.
4. Pump either latex or acrylic glue into the hole with a caulking gun until you feel a slight bulge. Clean any excess with a rag.
5. Prop up the ceiling with supports or screw a 1/4-inch-thick sheet of plastic-covered plywood into the lath. Remove after 24 hours. Scrapeoff any excess glue with a scraper. Allow to cure for another 24 hours.
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