![]() ![]() The building owners were concerned for possible exterior leaks into the wall cavity and a hidden mold problem.īecause the home had experienced leaks in other areas and had other mold problems we investigated further.īut the bulged wall problem in this case was essentially a cosmetic one identified and described as plaster wall shadow effect discussed below. Shadowing bulged walls traced to gypsum lath installation: as our photos show, below, the wall in this New York home was bulged in a regular rectangular pattern. How to Identify & Diagnose Pillow Effect Bulging Found on Plasterboard Lath (Rock Lath) Ceilings & Walls We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Page top photo provided courtesy of Minneapolis home inspector Roger Hankey. In this article series we describe and discuss the identification and history of older interior building surface materials such plaster, plaster board, split wood lath, sawn lath, and expanded metal lath, Beaverboard, and Drywall - materials that were used to form the (usually) non-structural surface of building interior ceilings and walls. Here we provide a photo guide to identifying types of plaster installed in buildings, using building ceilings as a photo and investigation guide. We have no relationship with advertisers, products, or services discussed at this website.ĭiagnose rectangular bulge pattern in plaster ceiling or wall surfaces: The crew crafted the job around the cornices, building plaster walls and reviving the ceiling without building out beyond the cornice profile.InspectAPedia tolerates no conflicts of interest. 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. 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. Into this circle he pours water, and then sprinkles the water with plaster.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.
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