Historically the common ingredients in plaster have included the materials in the following list. My photo above illustrates layers of plaster atop fiberboard wall sheathing and a top-most layer of modern drywall at the left side of my wall cut. Some uses of asbestos may not produce measurable levels of airborne asbestos in buildings. Watch out also not to panic but at the same time to avoid creating a dusty mess. patents describing the use of asbestos in plaster preparations from as early as 1896 (Knight, 1876 - not as a surface coating but in plaster-asbestos mixed for use in a gas regulator) which suggests asbestos addition to plaster was in common use even before that time. Lange (2002) identified chrysotile asbestos as a significant ingredient in a trowel-applied plaster coating on ceilings and walls in a school rotunda. beginning in the 1940's and confirmed by patents in the 1970's) in fire-retardant plaster based spray coatings. Watch out: asbestos was used in some (not all) plaster formulations in both fiber form (as reinforcement) and fine particulate form (as a filler or to improve workability) (Croce 1954) in both hand-troweled plaster and later (perhaps in the U.S. Your basement photo looks like old plaster that contained horse hair. Let me see some photos of the ceiling you are discussing Two coat and three-coat plaster on lath systems are detailed Yes some plaster contains asbestos, but certainly not all plaster used asbestos in its mix. The insulation around the pipe was 40% Chrysotile. The hairy plaster came back negative for asbestos. Update: The homeowner had a sample of this plaster tested for asbestos and reported: I have attached a picture of the wall containing long fibers. The other thing that scared me was the basement. White with brown cardboard looking substance in the cracks. Not sure when addition was done but it has paneling for walls. One is some white ceiling tiles in the closet. I appreciate your website since I have recently purchased a home built in 1870 that has many additions and upgrades. Ingredients in Plaster Used in Buildings Reader Question: asbestos in horsehair-plaster?Ĩ PHP asked 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. 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. This article describes the common ingredients used in making both trowel-applied and sprayed-on plaster used in building ceilings and walls as coatings, fire-resistant sprays, ornaments, and for similar indoor as well as exterior plaster coating applications. What are the ingredients in historic & modern building plaster? Do they include asbestos? We have no relationship with advertisers, products, or services discussed at this website.Ĭomponents or ingredients used in plaster walls & ceilings: InspectAPedia tolerates no conflicts of interest.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |