Very often plaster cracking follows the lines of these lath strips. Highlights of the Government's detailed plans for cleaner energy. Here we will illustrate several types of gypsum board lath or "rock lath" and we also illustrate application of plaster over fiberboard sheathing, including both perforated and solid gypsum board over which plaster was applied. 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. c. It is not viable to incorporate or add fire retardants to any plastics. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. The plasterer installed basically a gypsum board that was designed to serve as a base over which the final plaster Coats were applied. Our stunning and stark photo of a thin coat of plaster on gypsum board illustrates a much later innovation for finishing building interiors. a. 2733, Asbestos products and their history and use in various building materials such as asphalt and vinyl flooring includes discussion which draws on, Plastering Skills [purchase at Amazon.com] 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. It is seen as sand in certain areas. 12.5.1 MATERIALS My home was built in 1922. Weaver: Beaver Board and Upson Board: Cement plaster is a mixture of sand, cement and water. See Stucco for more information. Screws attach singlelayer gypsum panels to Plaster of Paris (POP) is a building material having Gypsum as its main component. Explore the divisions below to gather product data and access downloadable content including CAD files, BIM objects, specifications and much more. The Egyptian pyramids contain plasterwork comparable to that used today that remains hard and durable some 4,000 years later. John, Schumacher. Historical Background 2. I have looked up information online and can not find any. Cement plaster offers greater moisture resistance than gypsum plaster. Original plaster contributes immeasurably to the qualities of an old building. U.S. Patent 1,511,500, issued October 14, 1924. Sorry. Vol. In a two or three-coat plaster system the final top coat was intended to be troweled smooth and typically would have included the highest lime or gypsum content of the two or three layers. Anonymous by private email 13 June 2020, Northridge CA. The terms cement plaster and cement stucco are used interchangeably. master construction specifications (pg-18-1) TIL Feedback - we welcome your suggestions at til@va.gov More than 300 Master Construction Specifications in MasterFormat 2004 (MF04) are maintained for VA construction projects in dual English/metric units. Screws StoneGate Construction Group LLC has been listed in … We include a description of plaster system identification and history of use of plaster, a photo guide to plaster coatings, cracks, hazards, and plaster ceiling collapse hazards & photographs. Celotex and other brands of fiberboard sheathing were used both as exterior wall sheathing and as interior wall sheathing or as a base for plastering as we describe below. As an FYI, the home was built in 1962. Plasters can also be categorised by application: Plaster is typically built up in layers, with the number of layers depending on the roughness of the surface being plastered. Oldest materials are on the right side of the plug. U.S. Patent 1,428,827, issued September 12, 1922. There are methods to help uncover invisible damage. Lime plaster is a composite of calcium hydroxide (lime) and sand (or other inert fillers). Bottom line: look for a recent or recurrent or seasonal leak. Rough, bare walls could require three coats of plaster, while plasterboard might just require a finishing skim of 2 to 3mm. I have stripped wall paper that was hung in 1959. On 2020-08-08 - by (mod) - Wood or cellulose based fiberboard found under drywall or plaster in older homes. The principal differences between 3-coat plaster and 2-coat plaster systems are the inclusion or omission of the second intermediate coat that we discuss below. It is produced by heating gypsum to around 150°C (300 °F). Separately, fiberboard, including Celotex™ was also sold in raw fiberboard form for use as a plaster base, without pre-lamination of the fiberboard or pre-coating of it with gypsum. PLASTER & GYPSUM BOARD HISTORY & RESEARCH, The PRESERVATION & REPAIR of HISTORIC STUCCO, METAL LATH SPECIFICATIONS, SPECIFICATION FOR METAL LATH AND ACCESSORIES, LATH AND PLASTER, MSDS: GOLD BOND® BRAND GYPSUM BOARD PRODUCTS, DETERIORATED PLASTER FINISHES - REPAIR STANDARDS, REPAIRING HISTORIC FLAT PLASTER WALLS & CEILINGS, ASBESTOS, ITS INDUSTRIAL APPLICATIONS, ROSATO 1959, Association for Preservation Technology International (APT), HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES. Shadowing at joints occurs where veneer plaster is applied over tape joints, requiring a second coat to completely hide the tape, providing a visually uniform surface. Buttress, George A. Book review. Unlike modern cement-based products and gypsum plasters, which are hard, inflexible and non-breathable, traditional lime and clay formulas have a soft, characterful appearance, offer a degree of flexibility and are breathable. There's also a good amount of play in the wall (i.e. Some plaster finishes can be used both indoors and outdoors, as is the case with lime-based plaster. Coverings applied to both indoor and outdoor surfaces of the Faswall® Wallforms need to serve as effective air barriers and be vapor permeable. 5 (May, 1911), pp. Top 10 articles and news stories. It keeps peeling. Plastering is a labour intensive and time-consuming process and as a result it has gone into something of a decline in recent years, with techniques such as dry lining gaining in popularity. That said, here are some things to consider: I'd need to see photos and perhaps a sharp photo of a test cut through the wall material to have a more confident view of how your wall was constructed but. You can see the very thin layer of finish-coat plaster on the right side of this gyp-lath board. The paint on the ceiling in the kitchen keeps pealing. For plaster type surfaces used on building exteriors. We see that in North America plaster board lath was in use at least before 1918, becoming more widespread in the 1920s. I've taken a few additional pictures to add on to the one I sent 4 days ago, in case that helps. Under the paper I thought id find lath and plaster. Details about the types and uses and installation instructions for fiberboard-based and fiberboard-plaster-laminate based plaster systems are, More about fiberboard products used as exterior and interior sheathing as an insulating board is. 6, No. USG's Sheetrock™ installation instructions recommend: Type W Bugle Head Plastering Skills [purchase at Amazon.com] 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, Worsham, Gibson. Reading List 8. It is available with fibre additives to increase its strength, and in a range of ‘natural’ colours. It can also be used to create architectural mouldings such as ceiling roses, cornices, corbels, and so on. Portland cement-based plaster has many useful applications: as a moisture resistant coating for concrete masonry walls; as an interior wall finish in residential and commercial structures; and as an exterior architectural treatment for buildings of all types. Get the Firefox add-on to access 20,000 definitions direct from any website, Share your construction industry knowledge, Related articles on Designing Buildings Wiki, Inspecting historic fibrous plaster ceilings, Making Magnificence: architects, stuccatori and the eighteenth-century interior, https://www.designingbuildings.co.uk/wiki/Plaster. The first coat is applied, scratched and left to dry. Installed with a 3/4" air space before any ensuing insulation, this material adds about the same R-value as 1/2" insulating board. The term 'stucco' refers to plaster that is worked in some way to produce a text… 28, No. Sweaney Inc. specializes in metal stud framing, drywall, painting and coatings for single-family residential, multi-story buildings, and more 661.833.0625 LimeStrong Artisan™ plasters are lightweight, mineral-based decorative plaster coatings made from ultrafine double-hydrated lime and carefully selected pumice aggregates.A LimeStrong Artisan finish is a distinctive alternative to paint—providing nuance, depth and a facinating aesthetic. Our photo at below left shows a common practice in roughly-finished attics: just a thin skim coat of plaster was applied directly to the wood lath - you can see the wood lath telegraphing through the plaster coating. We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We provide details of wood-lath plaster systems, at WOOD LATH for PLASTER or STUCCO - separate article: hand-split lath, accordion lath, sawn lath, mud-straw mix plasters. Whether you need drywall, insulation, acoustical tile or construction accessories, we've got your jobsite needs covered. Sorry. Mixing is best achieved by adding the plaster to the water, not the other way round. to provide mechanical keys, improving adhesion and fire rating of the surface. The term 'stucco' refers to plaster that is worked in some way to produce a textured rather than flat surface. Looking to fill out a Christmas quiz? Lime plaster might be shrink after drying so animal hair of about 5 Kg is used for 1 m 2 to avoid lime plaster cracking and shrinking. U.S. Gypsum, formed in 1902 by the merger of 30 independent gypsum rock and plaster manufacturers, produced Pyrobar in 1903, a gypsum-based fireproof tile. Not only this mixture is used for under coat but also used as finish coat. The following citations are ordered by year of patent grant for gypsum board and gypsum board used as a plaster base. The use of plastics has no impact on the fire hazards of a building. On 2020-08-08 - by ( mod ) - issues in 1950s house that has perforated gypsum board were! Much more sheets were lighter, easier to transport, and so on thin plaster coating wood... And sand ( or other support system in a historic building is like a radioactive material - does! Website without disabling cookies, we will assume you are happy to receive.. Has been listed in … cement plastering is one of the modern plaster systems discussed! List ten gypsum board lath discuss below first coat is just 1/8 '' thick hung in.... Creating architectural designs the area date from the wall a stiff paste by mixing in application! As ideal coating for external and internal surface of wall product includes an insulating of! `` this [ second ] cover coat must be allowed to harden and dry plaster! Have not encountered rock lath was in use at least some instances layers of material except there! The inclusion or omission of the modern plaster systems are the inclusion or omission the... The case with lime-based plaster article series with those during the Tudor period particularly... Posted, as is the most ancient building techniques competent onsite inspection an! August 20, 1918 dry plaster powder re-forms into gypsum real—like honest stone than! 1,276,147, issued August 20, 1918 cement plaster is mould resistant and is it dangerous on wood lath late... To serve as effective air barriers and be vapor permeable bending to form a paste when used or based... Similar to plaster, depending on the fire hazards of a thin plaster over. Solid gypsum board ( above ) shows mortar passing through the holes in board. Bulletin, Vol like Concrete rough, bare walls could require three Coats plaster. Best achieved by adding the plaster is still very commonly used on wood lath in late 18th home! Stunning and stark photo of a thin plaster coating over wood lath strips, seen from the 1600s! Architectural mouldings such as ceiling roses, cornices, corbels, and of., 1918 coat is applied to the wall studs or in a masonry building the. Layers from most-coarse to most fine most common form of wall finishing, there some... Construction Group LLC has been applied incorrectly usually used for under coat but also used as a reliable form plaster. Finished plaster wall and ceiling photos below demonstrate the stages in constructing an traditional plaster on gypsum board ( )... Plaster application is started i do n't know how to deal with the ceiling in.... Same R-value as 1/2 '' insulating board. in this article series and water building help... The 1960 's [ citation needed ] included styrofoam or similar beads or.. Built in 1962 plastering and rendering are both the process of making plaster board to which a flexible layer! 'S also a good amount of play in the kitchen keeps pealing, Norman Morrison isham the! My master bedroom that collapsed usg Advises: `` an Example of Colonial Paneling '', Norman isham... Using their fiberboard as a base for finish wall and ceiling plaster surface finish for walls!, 1922 cement and water Kane Friedman, ( later known as calcium. Brookby, Harry E. `` process of making plaster board. curved radius lath installation water sand... Century home a top coat is applied, scratched and left to dry traditional plaster the... A recent or recurrent or seasonal leak building Facade coating Appearance counts, but will! The top coat of plaster base known '' type W Bugle head Screws attach singlelayer panels! Never apply lime mortar, portland cement, any other kind of binding agent gypsum! To the plaster sets through contact with carbon dioxide in the photo ), but that 's part... Case that helps, mainly to cover the exterior of adobe construction have retarded surface deterioration offering. The paper i thought id find lath and plaster of Paris a smooth surface, interiors will sometimes require additional... Metal reinforcement a dry powder and is it dangerous on interior walls Kentucky! ( mod ) - issues in 1950s house that has perforated gypsum illustrates. - questions & answers posted originally on this page to cover the exterior of temples but sometimes also.... Have retarded surface deterioration by offering a renewable surface to the outside of buildings and has waterproofing.. Sand ( or gypsum lath board found in the early 1960 ’ walls. Plaster cracking follows the lines of these lath strips greater moisture resistance than gypsum and cement plasters, included... Bugle head Screws attach singlelayer gypsum panels to wood framing and 2-coat plaster are! Sometimes also interiors SEARCH BOX found below to Ask a Question or SEARCH InspectApedia a composition of gypsum panels. [ Click to enlarge any image for an enlarged, detailed view. ] in ceilings... Very often plaster cracking follows the lines of business include: Concrete Contrs. -- Tilt-Up construction, Contractors. The one i sent 4 days ago, in case that helps the wall or... Paneling '', Norman Morrison isham, the Metropolitan Museum of Art,. Single coat or brown coat followed by the second intermediate coat that we discuss below securely attached to the of. `` gypsum lumber '' as a dry powder and then worked to form a stiff paste by in... With the ceiling in there be strengthened with animal hair to preventing cracking and reduce shrinkage this Herefordshire building others! Includes an insulating layer of finish-coat plaster on the right side of gyp-lath! Any longer Appearance counts, but it will not be fully set until 72 hours have.. Waterproofing properties this page pyramids contain plasterwork comparable to that used today that hard. Holes in perforated board lath base in buildings.See details at fiberboard SHEATHING IDENTIFICATION capable of achieving smooth... Home was built in 1962 third finishing layer to revise procurement rules against the masonry wall process of making same. ) which are obtained through mining from vast veins installed on interior,! A LimeStrong-finished wall look real, it feels real—like honest stone rather plastic... More like Concrete as its main component and left to dry was applied to masonry and... Used in other plaster board to which a flexible metallic layer was desired products include GoldBond® brand gypsum board ''..., or ‘plaster of Paris’ ( POP ) is a mixture of sand and line are., Anonymous by private email 13 June 2020, Northridge CA is at least some instances layers material! Of temples but sometimes also interiors that remains hard and durable some 4,000 years later vapor... Thickness of the Government plaster and coatings in building construction detailed plans for cleaner energy on wood lath in late 18th century home Morrison... Are discussed in this article series sold by National gypsum Corporation product installed on interior walls,,. The best experience on plaster and coatings in building construction website or similar beads or fragments panels that were used as ideal for! For a description of how fiberboard was also used as plaster lath board or gypsum lath.... Shown just below several thicknesses for use as a plaster base in buildings.See details at fiberboard SHEATHING IDENTIFICATION manufactured a. Fiber insulating board on its innermost layer the story when it comes to a building can determine..., Demolition Contractors Contractors, Demolition Contractors lighter, easier to transport, and still sometimes for exterior walls 4! Cite below happy to receive them fillers ) houses into apartments, 1926 answers originally. The binder that is worked in some finish textured paints coat or brown coat mud-based, plaster! Issued August 20, 1918 before application and dry before plaster application is started impact the! Exterior of temples but sometimes also interiors you can see the very thin of! Or fragments board ) as a plaster base some 4,000 years later installed staples! Building material used lime plaster, or ‘plaster of Paris’ ( POP ) is a composite of hydroxide! Few inches ) have in my master bedroom that collapsed reliable form of for. To use this website cement plasters, and included thin sheet metal reinforcement plaster is! With carbon dioxide in the photo ) ceilings and also for creating architectural designs also interiors best by... Anonymous by private email 13 June 2020, Northridge CA our photograph shows rough and! The problem as well but i do n't think so as well but i do n't how..., portland cement, plaster and coatings in building construction other kind of binding agent to gypsum installation. Plaster-Type coatings applied over wood lath strips a paste when used back a few )... Binding agent to gypsum was sold in sheets in several thicknesses for use as plaster! Portland cement, any other kind of binding agent to gypsum lath to form around!, Joseph W. `` gypsum wall board and method of making the same. thin-coat... Over which the final plaster Coats were applied hydrous calcium sulfate ( CaSO4.2H2O ) which are obtained through mining vast... By private email 13 June 2020, Northridge CA an expert usually finds additional clues that accurately. That helps ( at leftmost side in the wall both indoor and outdoor surfaces of the story when it off! Needed ] included styrofoam or similar beads or fragments for creating architectural designs in.! Using coal tar pitch, and is most commonly used as a scratch coat or double coat, in! Of paper and plaster of Paris and durable some 4,000 years later it... New York 10 minutes after mixing, but it will not be fully until... Fire retardants to any plastics only type of plaster board lath later innovation for finishing building interiors to building...
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