Plaster Ceilings Plaster Type Identification in buildings. Inspect. APedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. Types of plaster walls ceilings Here we provide a photo guide to identifying types of plaster ceilings and walls installed in buildings, using building ceilings as a photo and investigation guide. 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. Synonyms for plaster include stucco, render, lime plaster, cement plaster, gypsum plaster, and plaster of paris. Cracks-in-Drywall-Mesh-Tape-over-Crack.jpg' alt='Cracks In Newly Plastered Ceiling Patterns' title='Cracks In Newly Plastered Ceiling Patterns' />Lime plaster is also the principal ingredient in whitewash often used on building stone walls both indoors and outside and also sometimes applied to wood surfaces. Green links show where you are. Copyright 2. 01. 7 Inspect. Apedia. com, All Rights Reserved. Guide to Methods Types of Plaster Ceiling Wall Covering Systems in buildings. Photo Guide to Types Interior Plaster split wood lath, sawn wood lath, expanded metal lath, rock lath or plasterboard, drywall, tainted Chinese drywallClick to enlarge any imageArticle Series Contents. PLASTER TYPES METHODS in BUILDINGSPLASTER BULGES PILLOWSPLASTER INGREDIENTS, MIX, COMPONENTSPLASTER LATH, METALPLASTER, LOOSE FALL HAZARDSPLASTER TYPE IDENTIFICATIONThis article includes a photo guide to split wood lath, pit sawn lath, circular blade sawn wood lath, expanded metal lath, rock lath or plasterboard, drywall, tainted Chinese drywalldiscusses the types of plaster ceiling wall coverins used in buildings, giving a history and description of types of materials used. 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. Also see DRYWALL, FIBERBOARD, PLASTER INTERIORS where we include photographs of non plaster interior wall and ceiling coverings including drywall, beaverboard, and paneling. See DRYWALL ASBESTOS CONTENT for a discussion of asbestos in joint compound used on gypsum board systems for finishing joints, skim coats, possibly in gypsum board plaster systerms and other applications. Also see drywall identification photos at CHINESE DRYWALL HAZARDS. For plaster type surfaces used on building exteriors, see STUCCO WALL METHODS INSTALLATION. Plaster Ceilings Walls Applied over Wood Lath. Hand Split Wood Lath Based Plaster Ceilings Walls. Photograph of hand split wood lath and plaster wall, from the wall cavity side. Ca 1. 80. 0. Hand split wood lath will vary in width as you see in our photo above left. There are several generations of plaster and lath, plaster board, and drywall which have been used. We name and illustrate these and discuss their periods of use below as an. Examples Mud used as a plaster over split wood lath or woven wood lath. Horsehair mixed with plaster or cement for building exterior wall covering. Plaster of paris applied in at least two layers, a rough brown or scratch coat and a smooth white plaster top coat over hand split wood lath Sawn Wood Lath Based Plaster Ceilings Walls. Our photographs below show traditional sawn wood lath used as the supporting base for a typical three coat plaster ceiling or wall system. As with the older split wood lath, plaster of paris was applied in at least two layers, usually three layers a rough brown or scratch coat and a smooth white plaster top coat over sawn wood lath. Keeping House to Stave Off Grief On Marilynne Robinson and Finding Comfort in Domestic Rituals. At left you can see the ears or plaster ears formed by the plaster base coat, or brown coat the first plaster layer applied onto the wood lath of this antique New York home. Youll also notice that especially in older structures whose interior partition walls often used minimal and irregularly spaced framing for interior walls and ceilings, the plasterer sometimes tacked up an extra wood scrap the diagonal log in our photo at left to improve support for plaster lath, or to provide a nailing surface to secure the ends of wood lath that otherwise did not reach a vertical wall stud. Watch out often the framing supporting plaster ceilings in homes built before 1. Such ceiling structures were not intended to support the weight of a curious home owner or home inspector. Below left is a photo of an 1. Bleachery in Wappingers Falls, NY, restored by the author DF. Most of the plaster ears had broken away and plaster was falling from the walls and ceilings in this home. Using a flat bladed shovel we elected to remove all of the loose plaster. Our second wood lath plaster photo below right is particularly interesting because at least one of the wood lath sections shows the vertical, but regularly spaced saw kerf marks of a machine operated pits saw, a means of cutting wood used before circular saws were available and helping to date this building as pre 1. How To Install Cifs On Redhat Fedora. New York. Above we show a mud straw mix of plaster base coat used in a late 1. New York home, ca 1. Plaster on Lath Coatings or Layers 3 coat 2 coat plaster systems. Our plaster wall and ceiling photos below demonstrate the stages in constructing an traditional plaster on lath surface. The principal differences between 3 coat plaster and 2 coat plaster systems are the inclusion or omission of the second intermediat coat that we discuss below. After about 1. 91. Three coat Plaster system. Three coat plaster was applied in three layers from most coarse to most fine. Cracks In Newly Plastered Ceiling Patterns' title='Cracks In Newly Plastered Ceiling Patterns' />When applied over wood lath or later, metal lath, the first coat of plaster, the brown coat or scratch coat, is pushed through openings in the lath so that when it hardens it is mechanically secured to the building wall or ceiling. Below is a photo of the base coat of plaster viewed from the other side of a hand split lath wall in a pre 1. I restored. The base coat was very coarse and was referred to as a scratch coat or brown coat. 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. Plaster Types Methods in Buildings Plaster Ceilings, Plaster Walls Plaster Type Identification in buildings. PLASTER TYPES METHODS in BUILDINGS CONTENTS. Bug Reference. Want to find out more about common pests Simply click on any of the bugs below, and read more information. If you have problems with any of these. The gouges or scratches in the brown coat were made by the plasterer using a notched tool or saw tooth edged tool to improve the adhesion of the next coat. The first two plaster coats would each be about 38 thick while the final coat was quite thin, just 18 in thickness. Our plaster scratch coat or brown coat photo below shows how this surface was sometimes scarified to provide better adhesion of the top coats of plaster. However often the brown coat was simply applied roughly without gouging, as we show in this extra plaster rough coat photo Image file. The second coat of plaster in a three coat system was used to bring the surface of the finished wall forward and add thickness before applying the thinner, smoother finish coat. 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. Very often plaster cracking follows the lines of these lath strips.