Photo: David Carmack
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Using a 3/16-inch masonry bit, drill a hole in the plaster about 2 inches from the crack. When you hit lath, stop—the bit won't go through wood—pull out the bit, and drill another hole about 3 inches from the first and about 2 inches from the crack. Try to hit a strip of lath with every hole you drill. (If you miss, the bit will sink in right to the chuck.
Mark such holes with a pencil as a reminder not to inject them with primer or adhesive in the next steps; try drilling again about half an inch up or down.)
Continue until there is a series of holes about 4 inches apart on both sides of the crack. Vacuum the plaster crumbs out of all the holes.
Mark such holes with a pencil as a reminder not to inject them with primer or adhesive in the next steps; try drilling again about half an inch up or down.)
Continue until there is a series of holes about 4 inches apart on both sides of the crack. Vacuum the plaster crumbs out of all the holes.
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