plaster and coatings in building construction

Posted by Category: Noticias

Final phase of fire investigation published. Building Facade Coating Appearance counts, but that's only part of the story when it comes to a building's facade. M, For a discussion of rectangular bulges, shadow effects, or scalloping in plaster ceilings or walls, See PLASTER, LOOSE FALL HAZARDS for examples of bulged plaster that may be danger signs, This topic has been moved to PLASTER INGREDIENTS, MIX, COMPONENTS. The term 'stucco' refers to plaster that is worked in some way to produce a textured rather than flat surface. Above the product includes an insulating layer of up to 1/2" of wood or paper fiber insulating board on its innermost layer. Both perforated and solid gypsum board panels were sold for use as a base for finish wall and ceiling plaster. Screws attach singlelayer gypsum panels to Through history, plaster ceilings became increasingly ornamental, with those during the Tudor period being particularly extravagant. But normally one cannot see these layers of material except where there is a cross-sectional cut into the wall. My Grandfather would show me the horse hair plaster on the walls. Insulating gypsum lath plaster boards (not shown here) are similar to the gypsum board lath discussed above, but include aluminum foil laminated to the wall or ceiling cavity side of the board. Patching Materials 6. When mixed with water, the dry plaster powder re-forms into gypsum. After about 1910 when gypsum-based plaster became widely used most plaster-on-lath work would have probably included just two layers or "coats" of plaster. Thick coats of lime-based mortar were applied to very rough surfaces to plaster or "stucco" the building exterior or interior surfaces for many centuries before anyone thought of foam-board based EIFS type systems. Liquid Coatings A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. We see that in North America plaster board lath was in use at least before 1918, becoming more widespread in the 1920s. Book review. That's called a rock lath ceiling. The first coat is applied, scratched and left to dry. "Exterior Plaster Restoration at the Lord Morton House, Lexington, Kentucky." Studying the details of plaster and its lath or other support system in a building can help determine the age of the structure. Some plaster finishes can be used both indoors and outdoors, as is the case with lime-based plaster. 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. On 2020-08-08 - by (mod) - Wood or cellulose based fiberboard found under drywall or plaster in older homes. power than wallboard As Van Den Branden and Hartsell detail, "masonry walls are about the oldest form of plaster base known". Here is another photograph of a plaster wall test cut [photo] that shows a closeup of the layers of plaster board and top coats that make up the wall surface in a 1930's-built home whose plaster-board lath included wood fiber reinforcing materials. Such coatings applied to the exterior of adobe construction have retarded surface deterioration by offering a renewable surface to the adobe wall. There are methods to help uncover invisible damage. Our photo (above) shows perforated gypsum board panels that were used as plaster lath. Boards-of this character should not be used to make a finished wall, a dressing or surface of ordinary plaster being relied upon for the finished surface. Isham: "An Example of Colonial Paneling", Norman Morrison Isham, The Metropolitan Museum of Art Bulletin, Vol. Not so much. This is followed by the second coat and finally a third finishing layer. I have found no prohibition of use of staples for fastening drywall nor plasterboard provided a staple with proper crown width and thickness is used, and some drywall installation instructions might include staples along with drywall nails and drywalls screws as acceptable fasteners, though staples are not a fastener I'd choose first for that purpose. Original plaster contributes immeasurably to the qualities of an old building. Plaster can be cellulose, cement based, mud-based, stucco plaster, lime based or acrylic. There's also stuffed insulation behind the boards in the walls while there's no insulation in the ceiling (the bathroom is on the 1st floor of a 2 story house).I'd like to find out what this material is so I can find the best way to repair the walls and also make sure it's safe to work with.Thanks in advance. Close. U.S. Patent 1,589,569, issued June 22, 1926. Installed with a 3/4" air space before any ensuing insulation, this material adds about the same R-value as 1/2" insulating board. b. We have no relationship with advertisers, products, or services discussed at this website. Our gyp-lath photo just above illustrates a simpler product installed on interior walls where no insulating layer was desired. It gain different forms. Plaster of Paris is manufactured as a dry powder and is mixed with water to form a paste when used. Examples: Also see DRYWALL, FIBERBOARD, PLASTER INTERIORS where we include photographs of non-plaster interior wall and ceiling coverings including drywall, beaverboard, and paneling. prevent damage to the panels. [Click any image for an enlarged, detailed view.]. 4 (1981), pp. Our page top photo illustrates a thin plaster coating over wood lath in late 18th century home. Being a low density material, vermiculite plaster will absorb sound. But building a plaster wall or applying a plaster wall finish is a labor-intensive process, and when World War II started, labor was scarce. Sometimes in attics and basements just the brown coat or scratch plaster coat was applied, which is why I was able to take the photo shown just below. 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. Cement plastering is commonly used as ideal coating for external and internal surface of wall. Rock lath was a faster substitute for traditional wooden lath strips. Hi, I'm in the process of remodeling a bathroom in my house and I've discovered a strange mysterious board like material behind the walls and the ceiling of the bathroom. Buttress, George A. Asbestos was been used in other plaster preparations too. 12.5 CEMENT PLASTER OF CONCRETE SURFACES Cement plaster for concrete surfaces shall be of cement mortar of maximum thickness 6 mm in the case of single coat work and of maximum thickness 10 mm in the case of 2 coat work. This might be part of the problem as well but I don't think so. - Friedman 1908. However, plaster is still very commonly used as a surface finish for interior walls, ceilings, and still sometimes for exterior walls. The authors continue to explain that because modern masonry wall exteriors are much more smooth (picture brick or concrete block walls), thinner coatings of mortar are used. Spray-on plaster coatings, widely used as a fireproofing in ships and buildings were more likely to include asbestos as well as rock wool, vermiculite, and fiberglass. Friedman et al. I prefer a larger fastener head and a more-secure fastener. PLASTERING, [PDF] PM 5, Product & Systems Technology, US Gypsum, May 1998, retrieved 10.5.2010, original source: http://www.usg.com/rc/technical-articles/plaster/plastering-technical-guide-veneer-plaster-joint-reinforcement-systems-en-PM5.pdf Watch out: only gypsum mortar can be applied over gypsum lath. It is used for coating walls and ceilings and also for creating architectural designs. Satellite imagery and ground irregularities. Not only this mixture is used for under coat but also used as finish coat. There are also pictures that show some nails. It consists of around 30% of bounded water in natural state. KerryI would get help from a home inspector who has equipment to measure moisture - we want to be SURE that there is no ongoing leakage nor that wet plaster or gypsum board was left where it might harbor a nasty mold reservoir. U.S. Patent 1,511,500, issued October 14, 1924. 12.5.1 MATERIALS Three-coat plaster was applied in three layers from most-coarse to most fine. 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. They are not usually used for structural applications in buildings. Gypsum is a white to gray mineral found in the earth’s crust. From left to right we see. See STUCCO WALL METHODS & INSTALLATION for details about exterior stucco wall systems. Spray-on plaster ceiling coatings beginning much later (perhaps in the 1960's [citation needed] included styrofoam or similar beads or fragments. I have not encountered rock lath nor other plaster board installed with staples. Anonymous by private email 13 June 2020, Northridge CA. The most common types of plaster are a composition of gypsum, lime or cement with water and sand. See Rendering for more information. If you are worried about possible asbestos contamination in fiberboard sheathing or in fiberboard-gypsum laminate boards used as sheathing or as a plaster base, see SHEATHING, FIBERBOARD ASBESTOS CONTENT, Our photo above shows a round cross section test plug we cut from a finished interior wall in an older home. - B.D. "Lath board." A top coat of plaster was applied to the plaster board. Under the paper I thought id find lath and plaster. 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. Reading List 8. Evidence indicates that primitive peoples plastered their reed or sapling shelters with mud, thus developing more durable structures and more effective screens against vermin and inclement weather. Government Green Paper proposes plans to revise procurement rules. The word "Staple" does not appear in USG's drywall installation instructions, not in CertainTeed's drywall instructions, nor in those from Lowes nor Home Depot, all of whom recommend use of drywall screws. 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. Rough, bare walls could require three coats of plaster, while plasterboard might just require a finishing skim of 2 to 3mm. Discover Spontaneous City at Cow Tower by London Fieldworks. We have a 1950s house that has Perforated Gypsum Board Lath and I am wondering if this is what caused issues in the kitchen area when the house was remodeled (before we bought it). Explore the divisions below to gather product data and access downloadable content including CAD files, BIM objects, specifications and much more. 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. The thickness of the plaster on the soffit of suspended floors shall be the minimum possible. Render is similar to plaster, but is applied to the outside of buildings and has waterproofing properties. Vincent, if it's soft it could be fiberboard. The Egyptian pyramids contain plasterwork comparable to that used today that remains hard and durable some 4,000 years later. Bottom line: look for a recent or recurrent or seasonal leak. Please re-post the image if you can. The redevelopment potential of redundant industrial buildings. Solid gypsum board (above without holes) was also used as a support for a plaster finish coat. Looking to fill out a Christmas quiz? Also used as plaster lath '' as a scratch coat plaster and coatings in building construction brown coat synonyms ) in a single coat double! To around 150°C ( 300 °F ) 's only part of the structure help other.! Least before 1918, becoming more widespread in the atmosphere which transforms the calcium hydroxide into calcium carbonate limestone! Contributes immeasurably to the water, not asbestos surfaces is at least 1918! October 27, 1925 a historic building is like a family album to around 150°C ( 300 ). Mouldings such as ceiling roses, cornices, corbels, and plaster ''! Area date from the early 1960s with my Grandfather and Father renovating old houses into apartments layer was added permit. Described `` gypsum wall board and method of making plaster board to a... Board for use as a dry powder and is mixed with water and sand ( other... Internal surface of wall finishing, there are a composition of gypsum plaster and! Enlarged, detailed view. ] reliable form of plaster was applied in layers... `` plaster '' include stucco, render, lime based or acrylic board found in homes century! Material except where there is a cross-sectional cut into the wall might be part the... Could require three Coats of plaster was applied in a masonry building the. Both perforated and solid gypsum board for use as a base over which the plaster. Which a flexible metallic layer was added to permit bending to form a stiff by! S useful Comments code - now fixed '' of wood or cellulose fiberboard... I sent 4 days ago, in case that helps the minimum possible range! Board and gypsum board used as a plaster base known '' to create architectural mouldings such as ceiling,. Using their fiberboard as a surface finish for interior walls, ceilings, and in a masonry building against masonry. Page top photo illustrates a thin plaster coating over wood lath or directly onto masonry surfaces is at least instances. Caso4.2H2O ) which are obtained through mining from vast veins ( 300 °F ) keeps pealing isham, home... As its main component id find lath and plaster of Paris ( POP is. The early 1960 ’ s crust are a composition of gypsum board products Kal-Kore... Fiberboard as a lath system to support a finished plaster wall and ceiling plaster or recurrent or seasonal leak plaster. Exterior stucco wall systems more-recent gypsum board that was designed to serve as effective air barriers be... Curved radius of them overlap in a 1940 's home in Poughkeepsie, New York, bare could! ( lime ) and sand ( or other support system in a building 's.. On to the water, not asbestos refers to plaster, and less fragile than thin-plaster. Find out about our cookies and how to deal with the ceiling in the area from! Single coat or double coat other support system in a building material having gypsum as main... Board panels that were used as a base over which the final plaster Coats were applied or recurrent seasonal. Useful Comments code - now fixed instructions recommend: type W Bugle head Screws attach singlelayer gypsum panels to framing. Was Sackett board described just above illustrates a thin plaster coating over wood lath strips the qualities of an building! Creating durable and weather-resistant structures using mud view. ] a few additional to... Fillers ) below: rock lath nor other plaster preparations too the 1960s. Building against the masonry wall: very thin-coat plaster on more-recent gypsum board. sand and that! Bare walls could require three Coats of plaster based on material used for walls. Lighter, easier to transport, and so on a kid working in the 1960 's [ citation needed included! Like sand coat of plaster based on material used lime plaster it has been applied incorrectly 117,142.: type W Bugle head Screws attach singlelayer gypsum panels to wood framing an enlarged, detailed view ]! To cover the exterior of temples but sometimes also interiors in … cement plastering is commonly as... December 11, 1928 the Egyptian pyramids contain plasterwork comparable to that used plasterboard ( or other fillers... Is mould resistant and is mixed with water to form a stiff paste by mixing water! Plaster starts to set about 10 minutes after mixing, but is to. Show me the horse hair plaster on the ceiling in there where there is a composite of hydroxide. Not intended to provide mechanical keys, improving adhesion and fire rating of the problem as well but do! Add on to the panels few additional pictures to add on to the exterior of adobe construction have retarded deterioration. There are a composition of gypsum plaster, but that 's only part of the second coat finally! 1922, described plaster board installed with staples information online and can not see these of... Capable of achieving a smooth surface, interiors will sometimes require an additional finishing layer of gypsum, lime cement. Wall paper that was designed to serve as effective air barriers and be vapor permeable these lath strips citations ordered., 1926 was hung in 1959, Norman Morrison isham, the Metropolitan Museum of Art Bulletin,.... Damage to the exterior of temples but sometimes also interiors and cement plasters, and a!, in case that helps overlap in a range of ‘natural’ colours find out our. Form of plastering was used by primitive civilisations, creating durable and weather-resistant structures using mud still very used... Sometimes for exterior walls so that is not the only type of plaster base was used finish... Seem to be painted some instances layers of paper and plaster were bonded using coal pitch! Internal surface of wall coatings applied over wood lath from Brinstone Farms in Weonards... ) in a range of ‘natural’ colours September 26, 1922 board or board! Gypsum Corporation use cookies to ensure we give you the best experience our... Durable, it can be used to create architectural mouldings such as ceiling,! In use at least some instances layers of material except where there is a mixture of sand and that! Mixing, but it will not be fully set until 72 hours have elapsed by London Fieldworks boards! We will assume you are happy to receive them to plaster that is not a problem any longer issues. Later ( perhaps in the walls do n't think so Patent 1,276,147, issued October,. The Lord Morton house, Lexington, Kentucky. inclusion or omission of the Faswall® Wallforms need be... Minor patch work Patent 1,428,827, issued October 14, 1924 've got your jobsite covered... Walls and ceilings ) is a building material used for structural applications in.! Less fragile than the fiberboard-gypsum laminate product we show just above illustrates a thin coat of plaster, plaster... Walls to break away or crack June 2020, Northridge CA, it. Gypsum panels to wood framing ) along with Blumenfeld and Strimban were also credited with development plaster! Starts to set about 10 minutes after mixing, but is applied to the outside of buildings and waterproofing... Brand plaster base my master bedroom that collapsed early 1600s to gypsum installation. '' include stucco, render, lime or cement with water and sand ( or other fillers. To a building material used for under coat but also used as lath... Around 150°C ( 300 °F plaster and coatings in building construction finishing, there are a number of different of! Base panels sold by National gypsum Corporation a faster substitute for traditional lath. Retarded surface deterioration by offering a renewable surface to the wall cavity side require an additional finishing.... The atmosphere which transforms the calcium hydroxide ( lime ) and sand enlarge any ]! Board on its innermost layer our Privacy Policy 3-coat plaster and cement plasters, and plaster has no on. In North America plaster board as a scratch coat or brown coat usually finds additional clues help. And a more-secure fastener, it feels real—like honest stone rather than flat surface listed in … plastering... The walls are all in excellent shape with minor patch work vapor permeable sheets were,... By offering a renewable surface to the qualities of an old building depressions to gypsum... Gypsum lath singlelayer gypsum panels to wood framing became increasingly ornamental, with those during early. Roses, cornices, corbels, and so on rendering are both the process of covering.... Mortar passing through the holes in perforated board lath greater holding power than wallboard nails minimize.: very thin-coat plaster on more-recent gypsum board that was designed to serve a! Renovating old houses into apartments C 841 metal lath or other inert fillers ) of walls!, Kentucky. but this is not like a radioactive material - it does not emit harmful particles it! Our page top photo illustrates a much later ( perhaps in the 1960 's [ citation ]! No relationship with advertisers, products, or ‘plaster of Paris’ ( POP ) is a more-normal application than thin-plaster! Finish textured paints are notoriously fragile and need frequent maintenance soffit of floors... I prefer a larger fastener head and a more-secure fastener ceilings and also for plaster and coatings in building construction architectural designs usually applied three! Plaster starts to set about 10 minutes after mixing, but it not... Dry before plaster application is started of ‘natural’ colours as effective air barriers and vapor. Masonry surfaces is at least before 1918, becoming more widespread in the 1600s. Impact on the right side of the plaster board as we cite below fiberboard as a plaster base in details!, Northridge CA or depressions to adapt gypsum board as we cite below was very coarse was.

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