This is why you are more likely to find the technique used in historic buildings. It was most commonly used between the 1700s and the 1900s, before being supplanted by gypsum plaster and plasterboard in construction projects in the 1930s. Trowel on a finish, or white coat, which becomes the final, smooth surface. Lath and plaster is a traditional building technique and finishing process for interior walls and ceilings. 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. Pictured: Rory Brennan uses a damp sponge to smooth the final coat on a plaster patch. Trowel a scratch coat of plaster onto the lath. Just follow the steps on the next page, and your electrician’s less-than-handiwork will be history. A softer, slower-setting lime-based plaster, like the one I developed for Big Wally’s line of plaster-repair products, takes about an hour to set, isn’t prone to cracking or delaminating, and needs no sanding, which keeps dust to a minimum. It’s much harder than the wall’s original plaster, and it sets in the blink of an eye. What’s the wrong material? So-called patching plaster sold at home centers. If the chunk were small and cosmetic, I would just fill it with joint compound. Ask This Old House general contractor Tom Silva helps a homeowner repair a cracked plaster ceiling in an older home.SUBSCRIBE to This Old House. In my case, the walls were plaster over wooden lath. Without the right preparation and techniques, you’ll be stuck with a less-than-ideal finish that won’t last as long as it should. When it comes to painting lath and plaster walls, it’s important to keep a few common mistakes in mind. If the plaster sags 1/2 to 1 from the lath, there is often too much debris (broken keys, years of silt) between the plaster and lath for success. The method I described is the one I generally used. Common Mistakes When Painting Lath and Plaster Walls. If the separation is slightsay, between 1/4 and 1/2good reattachment is likely because the plaster will usually push back into place solid and flat against the lath. I repaired many instances of the 'chunk-of-plaster-falls-out' scenario. But it’s easy to make the damage disappear for good if you use good techniques and the right materials. I lived in a 1926 house with plaster-on-lath walls for 13 years. – Daniel and Lauren herlocker, Brattleboro, VT.Ī: Retrofit work by clueless electricians is the number one cause of damaged plasterwork these days. Q: The electrician who put in new light switches left gaping holes in our lath-and-plaster walls. 3-4 hours of work, plus drying time, over three days How to repair cracks and holes in plaster walls and ceilings that are lath and plaster, this also works for repairing cracks on normal plaster on brick or pl.
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