Although many of the techniques for patching lath and plaster walls are si. How to repair large damage / holes to a lath and plaster wall, and a bonus section on how not to plaster big holesMusic: Dan Lebowitz - Take Your Time (Yout. I use all-purpose, ready-mix joint compound for the succeeding coats, and I apply these exactly the same as if I were finishing drywall. I have a small hole in my old lath and plaster wall and I would like to patch it. Trowel on a finish, or white coat, which becomes the final, smooth surface. Trowel on, then roughen the brown coat after it has set slightly. The wet plaster of this coat oozes through the gaps in the lath and becomes a mechanical key when it hardens. Repairing a lath and plaster wall is much more involved, as you have to tear apart the plaster and potentially tear down the lath, and calls for some skilled labor. ![]() Durabond is almost unsandable, though, so I make sure to wipe the edges and overlaps clean. Trowel a scratch coat of plaster onto the lath. Next, wet the area to be repaired, and then apply a coat of. First, you’ll need to remove any loose plaster and ensure the wood lath is stable. To repair these walls, you’ll need to know how to apply a brown coat of plaster, followed by a smooth coat, to create a finished surface. The advantage of using Durabond (over a traditional plaster) is that it sets up as hard as plaster but dries quickly, so if I’m in a hurry I can apply a second coat the same day. Most older homes have plaster walls supported by a wood lath. After packing the joint with compound, I cover the seam with fiberglass mesh tape, and follow up with a second layer of compound. Poking holes in plaster walls can leave bare lath flapping and loosens the plaster surrounding the opening. ![]() I use a setting-type joint compound like Durabond 90 to fill the gaps, mixing up only as much as I can apply in about an hour. When all of the washers have been fastened, I vacuum the crack to remove any debris, then lightly mist the surface with water to prevent the dry plaster and lath from drawing moisture out of the patching compound before it’s had time to cure. The keys holding the plaster on to the walls slowly started cracking, and the sheet of plaster once held so nicely to the lath by the plaster keys started to become a little more free-standing, then it started to crack and became a little more free and a little less standing, falling away from the broken keys. After wiping away the excess joint compound, the crack is covered with fiberglass mesh tape, which is soon covered with a second layer of compound.
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