{"id":24613,"date":"2021-08-01T09:45:42","date_gmt":"2021-08-01T06:15:42","guid":{"rendered":"https:\/\/www.new.jonoubgypsum.com\/?p=24613"},"modified":"2025-04-06T09:54:54","modified_gmt":"2025-04-06T09:54:54","slug":"coats-properties-in-plastering","status":"publish","type":"post","link":"https:\/\/jonoubgypsum.com\/en\/coats-properties-in-plastering\/","title":{"rendered":"Coats properties in plastering"},"content":{"rendered":"\t\t
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Coats properties in plastering<\/h2>\n\n

Thickness and numbers of coats in plastering<\/h3>\n\n

Plastering<\/a>, a critical aspect of finishing work, relies on multiple coats and precise layer thicknesses to ensure a smooth, durable surface. Proper application involves understanding both coat composition and setting times to avoid common issues like cracking, detachment, or uneven surfaces.<\/p>\n

1. Thickness and Number of Coats in Plastering<\/strong><\/h4>\n
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  • Base Coats<\/strong>: For effective plastering, a minimum of three coats should be applied. The standard thickness is typically 2.5 cm or greater, with each layer adding stability and strength.<\/li>\n
  • Layer Composition<\/strong>: The first coat often uses a gypsum-soil mixture with a thickness of about 1.5 cm, providing a robust foundation. The following coat\u2014usually stucco\u2014adds an additional 1 cm, while a final polish coat, or \u201ckilled plaster,\u201d requires only 2 mm for a smooth, refined finish.<\/li>\n<\/ul>\n

    2. Setting Times and Coat Properties<\/strong><\/h4>\n
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    • Quick-Setting Plaster<\/strong>: Also known as adamant plaster, this type begins setting within 2 minutes and fully sets in about 15 minutes. Ideal for projects needing quick turnaround, this type ensures a firm base quickly but requires careful timing.<\/li>\n
    • Normal-Setting Plaster<\/strong>: With a setting time of about 6 hours, this is suited for standard applications where gradual drying reduces the risk of surface cracks.<\/li>\n
    • Retarded or Slow-Setting Plaster<\/strong>: Slowed by additives like hydrated lime (usually 10% of the plaster\u2019s weight), this type takes up to 20 minutes to start setting, allowing for adjustments during application.<\/li>\n<\/ul>\n

      3. Using Lime to Adjust Setting Times<\/strong><\/h4>\n

      Adding lime can extend the setting time up to 12 minutes, creating a slower drying process ideal for large or complex surfaces. To ensure smooth consistency, lime slurry should pass through a fine sieve (mesh less than 1 mm) to prevent clumps that may affect coat integrity.<\/p>\n

      4. Coat Materials and Surface Preparation<\/strong><\/h4>\n

      Adequate gypsum mortar includes combinations like thatch mortar, gypsum-soil mixes, or grit-enhanced mortars for different levels of adhesion and durability. Key surface conditions\u2014absence of ripples, cracks, and roughness\u2014are essential for achieving an even, flawless finish.<\/p>\n

      5. Preventing Cracks and Surface Defects<\/strong><\/h4>\n
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      • Layer Firmness<\/strong>: Ensure each coat dries completely before applying the next. Applying plaster to a wet or partially set layer increases the risk of cracking, detachment, or rippling.<\/li>\n
      • Gradual Application<\/strong>: Thick layers should not be applied all at once; instead, build them up gradually to prevent stress within the material that can lead to surface cracks.<\/li>\n<\/ul>\n

        6. Finishing Touches for Polished Surfaces<\/strong><\/h4>\n

        For smooth and light-reflective coats, extra care should be taken with precision and timing. Polished coats intensify light and highlight imperfections, so surface preparation and even, careful application are essential for a high-quality finish.<\/p>\n

        By following these guidelines, you can achieve a reliable, aesthetically pleasing plastered surface that is resilient against environmental stress and time<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

        Coats properties in plastering Thickness and numbers of coats in plastering<\/p>\n","protected":false},"author":5,"featured_media":25000,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,92],"tags":[35,30,26,40,16],"class_list":["post-24613","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-gypsum-plaster","tag-gypsum","tag-gypsum-powder","tag-gypsum-production","tag-plaster","tag-plastering"],"_links":{"self":[{"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/posts\/24613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/comments?post=24613"}],"version-history":[{"count":0,"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/posts\/24613\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/media\/25000"}],"wp:attachment":[{"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/media?parent=24613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/categories?post=24613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jonoubgypsum.com\/en\/wp-json\/wp\/v2\/tags?post=24613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}