![]() Over the years, plaster can dry out and lose its holding strength, or weaken from vibration, and the keys begin to break away. When the plaster is applied, it squeezes through the lath, creating “keys” that harden to form a strong integral bond with the wall. This base is usually strips of wood or metal wire mesh (both referred to as lath) that are nailed to the wall and ceiling framing. Plaster is heavy, and it needs a solid, well-anchored base to support its weight. Then prime and paint it to match the wall.įlaking and cracking plaster are relatively minor repair items, but when the plaster starts to sag, or “belly out,” from a wall or ceiling, it indicates deeper problems. When the patch is dry, use fine sandpaper to sand the surface smooth. In this case, use only joint compound for the final coat. Getting the surface coat smooth can be tricky, especially if the hole is large and you have limited plastering skills. ![]() When the patch is complete, and dry, just snip off the exposed wire. If necessary, wind wire ties wound around one or two dowels or sticks to hold it in place until the plaster mixture hardens.Īpply the plaster mixture in layers, allowing each to set before applying the next. Using tin snips, cut a piece of wire mesh that’s large enough to bunch-up and fill the opening when you push it into the hole. Begin by enlarging the hole just enough to expose firm lath around the perimeter. If there isn’t proper backing behind the hole, install backing first. Working from the edges inward, push the plaster mixture into and through the lath for a good bond. Or, you can use a screwdriver or a utility knife.įirst brush away loose plaster and dust. Wearing safety glasses, take a lever-type can opener and use the point to widen the crack to about 1/8 inch, as shown at right. It just takes a little spackling compound to repair fine cracks, nail holes, and gouges in a firmly anchored plaster wall. If, when you push on the wall, it flexes as though it has broken away from its support base, call a plaster specialist-the repair will involve removing the loose plaster and replacing it. Small cracks in plaster are relatively easy to repair, with one condition: The plaster must be firmly anchored to the lath behind it. Cracks leading from windows and doors or along seams in the ceiling can signal more significant damage, so you may want to call in a contractor to take a look at your home’s structural integrity.
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