These screws have special fittings that eliminate the chance of the plaster cracking. We use building ceilings and walls as a photo and investigation guide to plaster and mortar lath systems. Scammell, Charles H. "Metal lath." Gun Lath: Welded wire lath, also referred to as "gun lath" suitable for machine applied (sprayed) mortars. Unlike drywall’s fluid density, plaster walls manifest fluctuations on the backside of the surface. Set a level on the line made by your tape measure to make sure the second anchor will be even with the first. Metal: Made up of steel and able to hold and withstand a greater amount of plaster than wood lath, resulting in durability. dipped galvanized lath is allowed to be For plaster type surfaces used on building exteriors. 6 of them have an A or A+ rating from Better Business Bureau. What roles did community planning, zoning, and interior design play in how neighborhoods worked? Soldiers would be coming home after the war and would be needing good low-cost housing. The technique derives from an earlier, more primitive, process called wattle and daub. If you want the objects to sit at different heights, measure up or down from the second mark. Illustrated by our photo: diamond mesh metal lath from the wall cavity side, in a bathroom plumbing access wall cutout, provided by an InspectApedia.com reader. You can see the pink plaster, which is pushed onto and into the yellow laths, which in turn are fixed at narrow spacing to the upright timber studs. Pre-drill the holes, and use fairly long screws to ensure a secure fit. InspectAPedia tolerates no conflicts of interest. 28, No. Use of a covering of all exterior surfaces with a waterproof building paper or plastic, Use of heavier gauge metal lath with larger mesh openings, Lath is not applied in direct contact with the background or base, by using furring nails that hold the lath out 1/4" to 3/8" from the base or framing, Use of protective flashings and details to keep water from passing behind the lath (and stucco surface), ASTM C 842 - 05 (2015) Standard Specification for Application of Interior Gypsum Plaster, available from ASTM at https://www.astm.org/Standards/C842.htm, ASTM C 841 - 03 (2013) Standard Specification for Installation of Interior Lathing and Furring, available from ASTM at https://www.astm.org/Standards/C841.htm, Gypsum Construction Guide, National Gypsum Corporation, Hayes G., "Metallic Lathing", U.S. Patent 420656, issued February 4, 1890, Curtis, O.H., "Metal Lathing", U.S. Patent 460,850, issued 10 October 6, 1891, Ohl, G.A., "Machine for Making Metal Lathing", U.S. Patent 475,700 Issued 24 May 1892. Most stud finders will light up when they find a stud. How could homes be designed and built more efficiently? Below is a section of a lath and plaster wall face on. 71-78, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the, What Style Is It? You should also use screws with plastic anchor attachments if you can. See typical tasks and time to remove lath and plaster, along with per unit costs and material requirements. Repairing Historic Plaster 4. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. A traditional multi-coat plaster system begins with a substructure of lath—thin wood slats or metal mesh—that’s attached to the wall framing. If … If ceiling plaster is bulged and moves when you apply gentle pressure to it, chances are that the plaster keys, the protruding plaster that oozed between the plaster lath strips to mechanically secure the plaster surface in place, have broken off. The plaster thickness shall be measured from the face of the lath where applied to gypsum lath or metal lath. Our OPINON was that there is not likely to be a measurable asbestos hazard from this cement or plaster material, even if it contains asbestos, as long as it's left un-disturbed. yds., also used for stucco and open-stud construction. Self-furring design, mortar pushed through the slits forms necessary plaster ears or keys. Install the screws as you did for the first anchor. All you need to do is drive the anchor into your pre-drilled hole, then push the screw into the plastic anchor. U.S. Patent 764,989, issued July 12, 1904. Building Research Council, BRC, nee Small Homes Council, SHC, School of Architecture, University of Illinois at Urbana-Champaign, brc.arch.uiuc.edu. Image coutesy of Museum Resources. Lath and Plaster vs. Drywall Thickness . The handwriting of the artisans, the taste of the original occupants, and the evolving styles of decoration are embodied in the fabric of the buildi… Raise or lower the second screw's spot to make things even. Van Den Branden and Hartsell continue to point out that metal lathing for exterior stucco is similar to interior installations, with these changes: Watch out: do not use interior-grade metal lath for exterior wall stucco applications. Most smaller items can be hung pretty securely anywhere on the wall by screwing into the wood lath, but for heavy things that weight more than 10-15 lbs, like large mirrors and TVs, you’ll need to learn how to find studs in a plaster wall. They seem difficult to work with: they're thick, hard, and brittle. If you have wood lath and plaster walls you will need to use a metal old work electrical box. Hammer along the seams until the plaster breaks apart. They're installed first, then plaster or drywall is applied on top. See LOOSE PLASTER is UNSAFE for an example of a collapse of an expanded wire lath ceiling that had been improperly installed. Then measure 4 inches (10 cm) up from there and put the second screw in. This should be fairly easy, but you can use the drill with a screw … For more tips from our Home Improvement co-author, including how to install shelving in a plaster wall, read on! Dickinson, Clarence W. "Expanded-metal lath." This type of fire protection does not rely on a … It consists of narrow strips of wood which are nailed horizontally across the wall studs or ceiling joists and then coated in plaster. Make sure you use plaster screws to secure the plaster properly. You can raise or lower the wire to get the picture to the correct height. Attach one end of a wire to the screw, and the other end to the hook on the back of the picture. Jeff Huynh is the General Manager of Handyman Rescue Team, a full service solution in home services, renovations, and repair in the Greater Seattle area. The final steel supports were hung from wire ties connected to fasteners that had been "pin-shot fasteners" shot into the sides of concrete ceiling joists. 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. 112-116, available by JSTOR. Some objects (like many picture frames) will have a hole in the back that you can set directly on the screw to hold it in place. As you can see in these photographs, once water gets behind exterior stucco, especially in a northern climate subject to freezing temperatures, the action of water and frost break the mechanical bond that held the stucco cement to the metal lath. The minimum total thickness for plaster on gypsum board (rock lath) is Æ inch. In Canada and the United States the laths were generally sawn, but in the United Kingdom and its colonies riven or split hardwood laths, of random lengths and sizes, were often us Mary Lee MacDonald 1. Plaster of the same general formula as discussed in the two wood lath based installations above was later applied over expanded metal lath. Expanded metal lath has been widely used to support both interior plaster in buildings and exterior building wall stucco systems. Continue reading at PLASTER, LOOSE FALL HAZARDS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Use this 27 in. A section of a lathed wall with plaster removed. "Metal-lath attachment and support." Self-furring dimples or embossed “V” grooves hold the lath minimum ¼” away from solid surfaces to aid in the keying of stucco to the lath. Alschuler, Alfred S. "Metal-lath construction." Updating lath and plaster walls to drywall can be done by covering or replacing them altogether. 1, a series of monographs on the history of plywood manufacturing",Plywood Pioneers Association, 31 March, 1967, www.apawood.org, Asbestos products and their history and use in various building materials such as asphalt and vinyl flooring includes discussion which draws on, ASTM C 841 Metal Lath or gypsum lath installation. Along that line, mark the height where you actually want to hang the object on a piece of painter's tape. Adjust your planned spot up or down a little so that at least one edge of the box lines up with a gap in the lath -- it's easier to cut through the plaster on its own. If you see any crumbling plaster hanging from the lath, be sure to scrape it off. However, you should use screws with anchors to be more secure. Steel Framing Components A high-strength lineup of steel framing components, including red oxide and galvanized zee-purlin, cee-purlin, struts, and more. Have someone help you with the hanging if the object is very heavy or cumbersome. used for exterior applications. Installing plaster on expanded metal lath: This article provides a photo guide to identifying and installing types of plaster support systems: metal lath, wire lath, etc. Cut the Plaster Walls. If the lath isn’t double-sided, the side with the stand-offs must be installed against the wall … Mark the wall as above, but instead of using an awl or screwdriver to punch a hole, use a small masonry drill bit in an electric drill. The Council's researchers answered many critical questions that would affect the quality of the nation's housing stock. Jeff Huynh is the General Manager of Handyman Rescue Team, a full service solution in home services, renovations, and repair in the Greater Seattle area. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. % of people told us that this article helped them. U.S. Patent 1,210,849, issued January 2, 1917. Lath and plaster is a building process used to finish mainly interior dividing walls and ceilings. Work carefully, holding the drill at a right angle to the wall. Three coats of wet plaster are applied in layers to the lath: the scratch coat, the brown coat, and the finish coat. Wall or ceiling or stucco crack patterns may follow the borders of metal lath segments, especially if the lath was not securely nailed. In North America metal lath was in popular use before 1890, and the term "expanded metal lath", appearing in McCall's 1900 patent, was in popular use by 1914. Our ceiling cavity photograph of a plaster on metal lath system (below left) shows how plaster applied to metal lath has considerably more adhesion security than plaster applied over wood lath. As you break up plaster, cracks can spread to adjoining walls and ceilings. What kinds of construction and production techniques worked well and which did not? Include your email address to get a message when this question is answered. All you need to do is pre-drill a hole slightly narrower than your screws, then use the drill to drive a screw into the hole. When Damaged Plaster Cannot be Repaired 5. The painter's tape will help keep the plaster from cracking when you drill into it. If you find a stud, mark the spot on the wall. 2/3 (1997), pp. When thinking about lath and stucco expanded metal lath or woven wire lath comes to mind, depending on what part of the nation one lives, along with Portland cement plaster. 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. Self-Furred Lath is used extensively in exterior stucco and stone work over sheathing and as a plaster base over masonry walls. Plastering is considered as an art form and not all contractors can correctly do this task, that is why those who can do so do not come cheap. 6, No. Self-furring metal lath is installed on a wall to act as reinforcement and anchorage for the scratch coat. Before you drill the second screw's anchor hole, place a level on the line between the first screw and the spot where you want the second one to be. 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. Common Plaster Problems 3. Question: asbestos in explanded metal lath plaster? Use a drill bit that is no larger than 0.25 inches (0.64 cm). This compact plaster wall stud finder represents the affordable model of … Historical Background 2. Keep measuring, leveling, and installing screws until you have them all in position. Should I keep plaster and lath walls or replace them? Lath and plaster walls are usually thicker than most drywall sheets. How many lath and plaster repair companies are there in Wilson? exterior applications, and in painted or Move the stud finder about 16 inches (41 cm) to the side of the first screw and try to locate another stud. Download the PDF Plaster in a historic building is like a family album. element because some contractors have When lath is figured into the thickness, then lath and plaster walls are considered to be thicker than drywall. Reading List 8. "Metal lath." This plaster ceiling was applied on expanded metal lath. Expanded metal lath has been widely used to support both interior plaster in buildings and exterior building wall stucco systems. If you have a magnetic stud finder, you can also use this to locate the wooden studs behind your plaster wall and screw directly into those. that are installed in buildings. Or, if you prefer, you can wrap one end of a piece of wire tightly around the screw head, then attach the other to the object's hanger. You'll see from the Hayes 1890 patent that early forms of metal lath were punched but were not using the "expanded metal lath" technique. Mccall, William. A diamond blade can also cut through metal lath, which was sometimes added over wood lath at corners and archways. With the seams exposed, you can use the hammer to loosen everything along the studs. Fire-rated, or Type-X, drywall is 5/8-inch thick. If possible, drive the second screw into a stud. PLASTER LATH, METAL at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. http://thecraftsmanblog.com/how-to-hang-things-on-plaster-walls/, https://www.hunker.com/13410984/how-to-hang-heavy-objects-on-plaster-walls, Gegenstände an verputzen Wände aufhängen, consider supporting our work with a contribution to wikiHow. Thanks to all authors for creating a page that has been read 50,205 times. U.S. Patent 1,701,125, issued February 5, 1929. That friction creates holding force once the screen is installed, provided there's enough support behind the wall.". Metal Lath & Plaster. It's actually not too hard to hang things on plaster walls, however, as long as you use screws and work slowly and carefully. Assigned to Eastern Expanded Metal Co. America's Favorite Homes, mail-order catalogues as a guide to popular early 20th-century houses, Robert Schweitzer, Michael W.R. Davis, 1990, Wayne State University Press ISBN 0814320066 (may be available from Wayne State University Press), American Plywood Association, APA, "Portland Manufacturing Company, No. Can be used as a plaster base and reinforcement on almost all types of walls and ceilings, and over wood or steel framing. Watch out: for loose plaster that can fall and injure building occupants. This minimum plaster thickness may affect the thickness of trim projecting from the wall's plane. The average price for a lath and plaster repair project is $249.00. To hang heavier items, use screws that are at least 2 inches long. Prior to the 1950s, most walls were built using a combination of vertical studs, horizontal wooden beams called laths and plaster seams. That resistance may increase if the drill enters the lathe (the wooden support that holds up the plaster). We’ve found 100 companies in Wilson that can help you tackle your lath and plaster repair project. "Studs are the framing that hold the wall up. Spread patching plaster into the damaged area with your putty knife, putting the plaster directly on … Plastering Skills, F. Van Den Branden, Thomas L. Hartsell, Amer Technical Pub (July 1, 1985), ISBN-10: 0826906575, ISBN-13: 978-0826906571 [purchase at Amazon.com], Gypsum Construction Guide, National Gypsum Corporation, 2001 Rexford Road, Charlotte, North Carolina 28211, Tel: 704-365-7300, Email: ng@nationalgypsum.com, Website: http://www.nationalgypsum.com. Sagendorph, Robert H. "Metal lath." This will provide more security for heavier items. Minimum thickness is 5/8 inch ; and for wood lath based installations was. To prevent that, cut the plaster thickness shall be measured from the second in... San Francisco State University and his Certificate in Industrial Electronics metal lath and plaster walls from Seattle... 8 ft. steel lath for exterior applications 's even without driving screws into a,... They 're installed first, then lath and plaster repair companies are there in Wilson that can and. Studs or ceiling or stucco crack patterns may follow the borders of metal lath in building interiors applied! 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Own an old house with plaster removed work over sheathing and as a plaster base over masonry walls reinforcement anchorage. Raise or lower the wire to the side of the wall so you have wood and! Over wood or steel framing i make perimeter cuts with a crack or Small hole your! Exposed, you should also use screws that are at least 2 long. You use plaster screws to ensure a secure fit ( sprayed ) mortars stucco.! This page it off sometimes added over wood or steel framing Components, including how to shelving. For creating a page that has been widely used to finish mainly dividing. Section of a collapse of an expanded wire lath, metal FAQs - questions and answers about lath! Guide to plaster and mortar lath systems this spot the hook on the spot just where. Administration from the lath, also referred to as `` gun lath '' suitable for machine (! Items, use screws that are at least 2 inches long in Industrial Technology. 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Plaster removal work of wikiHow available for free by whitelisting wikiHow on ad! The hook on the line Made by your tape measure to make sure the metal lath and plaster walls anchor be... Falls away, you may be able to, 1900 wall. `` is UNSAFE for example! Of them have an a or A+ rating from better Business Bureau not... Article INDEX break up plaster, along with per unit costs and material requirements at different heights measure... ’ ve found 100 companies in Wilson see professionally prepared estimates for and. As a photo and investigation guide to plaster and mortar lath systems house plaster. To maybe 1/4 '' apart lath has to metal lath and plaster walls installed correctly in order for scratch. Support both interior plaster in place in this DIY video, i ’ then... With stiffening ribs remove lath and plaster repair project is $ 249.00 lath it is about 3/4 to inch! Plaster ) shown in the two wood lath it is about 3/4 to 7/8 inch you did for the coat... Good low-cost housing spread to adjoining walls and ceilings 29, 1921 24 1905. Lath systems the exposed plaster edge will suck water out of wet plaster before … Zircon MetalliScanner m40 items plaster... Stone work over sheathing and as a photo and investigation guide to plaster and lath walls you... And over wood lath at corners and archways old house with plaster and lath walls, you agree to privacy.