Photo above: expanded metal lath, diamond mesh, in a Canadian home, courtesy of an reader. Modern diamond mesh lath is sold in a variety of metals including galvanized, stainless steel, finished to ASTM 653, and in a remarkable range of pre-formed shapes including Expanded metal lath - diamond mesh plaster lath, formed from sheet metal cut into a diamond pattern, pulled to an expanded shape.Photo above: diamond pattern expanded metal lath stacked for sale at a building supply store. Van Den Branden and Hartsell explain that metal lath for plaster systems is divided into four groups with different properties for different applications: Wall or ceiling or stucco crack patterns may follow the borders of metal lath segments, especially if the lath was not securely nailed. Metal lath was on occasion used also to support poured concrete ceilings (shown here) - unlikely to provide adequate strength for a thick pour unless additional reinforcement was used.ĭepending on building age we may find a mixture of multiple types of plaster support, wood lath, gypsum board lath, and metal lath. Our photo shows expanded mesh metal lath used as plaster lath support for ceilings and walls this material was also used on building exterior walls to support a stucco finish. Plaster of the same general formula as discussed in the two wood lath based installations above was later applied over expanded metal lath. This article explains plaster systems based on metal lath in building interiors.Īlso see STUCCO WALL METHODS & INSTALLATION for a discussion of exterior uses of stucco and metal lath. Expanded Mesh Metal Lath for Plaster Walls & CeilingsĮxpanded metal lath has been widely used to support both interior plaster in buildings and exterior building wall stucco systems. 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. 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. We use building ceilings and walls as a photo and investigation guide to plaster and mortar lath systems. This article provides a photo guide to identifying and installing types of plaster support systems: metal lath, wire lath, etc. Installing plaster on expanded metal lath: We have no relationship with advertisers, products, or services discussed at this website. Pictured: Rory Brennan uses a damp sponge to smooth the final coat on a plaster patch.InspectAPedia tolerates no conflicts of interest. 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. But it’s easy to make the damage disappear for good if you use good techniques and the right materials. – 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
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