![]() ![]() Brennan owns Preservation Plastering in Brattleboro, Vt., and maintains a YouTube channel with many plaster repair how-to videos.įollow the photos and captions for a step-by-step look at Brennan’s process, which includes products for a patching system he developed called Big Wally’s Plaster Magic. To show you how the pros do it, we’ve adapted a video called “How to Repair Lath and Broken Plaster,” by Rory Brennan, who has been repairing plaster for 30 years. Plus, without the proper prep work on loosened plaster, any patch is doomed to failure. The most durable plaster repairs are made with plaster, not joint compound. No problem, the drywallers will handle it, right? Wrong. To mount an HVAC duct, we’ve cut through a plaster wall with a recip saw, sending plaster flying and leaving the lath flapping. The crew crafted the job around the cornices, building plaster walls and reviving the ceiling without building out beyond the cornice profile.We’ve all seen it, and we’ve all done it. Where the ceiling had been punched open for ceiling supports, patching was done with wire mesh and plaster before a skim coat was applied to the entire ceiling. In areas where the brick had deteriorated, wire lath was used to create a sound surface and a level wall. In the Manhattan Brownstone project, a variety of methods were employed, including plastering directly over the existing brick walls that were first treated with a blue bonding agent. Sometimes they can use the brick surface that remains, sometimes they must affix wire lath to the brick to serve as a support for keying the new plaster. “Our crew makes a determination on an individual basis,” Annino says. The plaster crew must first assess the existing walls, masonry, or ceilings that need to be plastered. The quality of any plaster job and the degree of adhesion depends, in large part, on the integrity of the surface on which it’s applied. “Each plaster job is unique,” Annino says. Master plasterers work with a spray bottle to keep the plaster wet as they smooth it to a perfect finish. Builders use narrow strips of wood, called laths, that are fastened horizontally between studs or ceiling joists to create the wall or ceiling. At this point it is ready to be mixed into putty. The reaction is complete when the slaked lime stops giving off heat.Once poured in, the lime and plaster mix is left to “slake” or sit and transform itself.The measurements are inexact to the untrained eye, but very precise to the plasterer who has to “feel it out,” as Gary Annino of Boro Plastering explains. Check here for a video demonstrating how to repair water-damaged plaster If you have more severe plaster damage with wall material falling off the lath, use the process at this link to make repairs. Into this circle he pours water, and then sprinkles the water with plaster. The repair process on this page can be used to repair water damage to the surface layers of plaster walls and ceilings.First the plasterer creates a “gauge” that is a circle of putty, banked up like a swimming pool, on the mixing board.This lime putty is used for the finish coat of plaster that is skimmed onto the wall and smoothed to create a hard, shiny finish coat. “This is where art meets science,” Bob says, as he watches the mix being prepared for the lime putty. With a traditional lime finish coat, the plasterer becomes a chemist. Finish coat: The third and final coat is an application of lime putty, which gives plaster walls their smooth, hard, shiny finish.The sand provides a rough texture that gives the light, 1/8-inch finish coat a surface to grip onto. Brown coat: The second rough coat is made of the same mixture and is called the “brown coat.” The brown coat is applied directly to the scratch coat, also at a 3/8-inch thickness, but left unscored.After explaining to Kevin that his paint job is only as good as the prep work, the two discuss where cracks are most likely to occur before diving into a few repairs. Scratch coat: The first coat is called the “scratch coat” and is applied at 3/8 inch thick then scratched or scored with a comb to give it a rough texture. 4 hours Mauro Henrique gives Kevin O’Connor a lesson on patching cracks in plaster and drywall.Boro Plastering works with a ratio of three-to-one, bags of sand to bags of gypsum, for their rough coats. Many firms now work with gypsum since it eliminates the need for added fiber and has a much quicker set up and drying time. If it is a true plaster wall start with a rough coat of Structolite then. The lime is typically derived from limestone or ground oyster shells. I am sure there are many different ways to fix your walls. ![]() These coats form the base of the wall and are mixed of lime or gypsum, aggregate, fiber, and water. The three-coat plaster system begins with two coarse or rough coats.
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