The larger number of plaster-filled holes created better bonding keys. Metal lath did not contract and expand as much as wood lath, and the mesh screen had more holes for the scratch coat to ooze through. In the late 1800's, metal screen types of lath and gypsum-based plaster came into use because these materials had a few advantages. The third coat was a finer, 1/8-inch thick finishing layer. The second coat, called the brown coat, was a 3/8-inch-thick layer that created a flat surface on which to apply the final coat. Scratches were raked onto the plaster surface to create a bond for the second coat. The plaster oozed into the gaps between the lath strips to create plaster “keys” that held the plaster on the wall. The first coat, called the scratch coat, was a 3/8-inch-thick layer troweled onto the wood lath. The highest-quality plaster work was applied in three coats: A gap was left between each two adjacent wood lathes. After the mid-1850s, houses and buildings were constructed with thin, uniform strips of pine wood lath that were nailed to the interior stud walls and ceiling joists. The lime plaster was a mixture of lime, water and sand with animal hair used as a binder. Until about 1900, all plaster walls and ceilings were done with lime-based plaster applied over wooden lath. Be aware that if you remove the original plaster in your house or building as part of a rehabilitation project, you could jeopardize your eligibility for federal or state tax credits. Plaster is an important part of your house or building’s historic character. Plaster became popular because it is a durable, fire-resistant finish that muffles sound. The cured plaster can be painted or covered with wallpaper, stenciling or other decorative features. The plaster is allowed to dry or “cure” for a period of time. This paste is applied either to brick walls or over thin strips of wood lath in frame buildings and on ceilings. When mixed with water, plaster forms a thick paste. Plaster is a powder made primarily from lime or gypsum. It was the most common interior finishing material used during the 19 th and early 20 th centuries. Plaster has been used for thousands of years. If you own a historic house or commercial building, there is a good chance that your building has plaster walls and ceilings. Strategic procrastination is the secret of period property ownership, as others here will attest.Repaired plaster walls/ceiling - ready for paint. Or if it is actually a lath wall, then scraping back a divot and applying a stainless penny washer and screw into the lath works well (typically used to preserve historic ceilings). If you do want to keep yourself busy, a simple fix is to drill a small hole through the detached area and inject adhesive or slurry plaster (assuming the plaster IS on stone). The worst that could is that the area detaches and then you can patch replaster at that point. Unless it's a ceiling that may fall on you, nothing bad is likely to happen. I have plenty of such areas in my house that have been fine that way for the 25 years we've lived here. However, the good news is that practical experience tells me to leave them alone. Thirdly, to answer your actual question, you are correct that walls plastered onto stone shouldn't sound hollow and that the cause is likely that the plaster has blown (detached from the stone or underlying coats). You would be amazed how many walls appear to contain turning machines.Though, our pedants would instead pick you up on the fact that plaster directly applied to stone walls would not need laths (these are substrates for bridging hollow areas, such as ceilings or stud walls). Secondly, congratulations on correctly spelling lath.
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