{"id":211933,"date":"2025-06-05T15:19:07","date_gmt":"2025-06-05T19:19:07","guid":{"rendered":"https:\/\/www.constructionspecifier.com\/?p=211933"},"modified":"2025-06-05T15:19:07","modified_gmt":"2025-06-05T19:19:07","slug":"benefits-of-single-component-premixed-grout","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/benefits-of-single-component-premixed-grout\/","title":{"rendered":"From mix to fix: The benefits of single-component grout"},"content":{"rendered":"

By Howard Jancy<\/strong><\/p>\n

\"A<\/a>
Photos courtesy Custom Building Products<\/em><\/figcaption><\/figure>\n

Single-component grouts, which do not require the addition of water or epoxy resins at the job site, have evolved significantly over the years. The latest product formulations, now backed by industry-accepted standards, offer a host of benefits for both project owners and installation contractors.<\/p>\n

A significant development for single-component grout is the introduction of dedicated ANSI standard designations: ANSI A118.19, Organic Premixed Grouts for Installation of Ceramic Tile and ANSI A108.22, Installation of Premixed Grout in Tilework. This standardization underscores the advancements in the product, ensuring quality and reliability in every application. The standards are applicable for tiles defined by ANSI A137.1, Specifications for Ceramic Tile; ANSI A137.2, Specifications for Glass Tile; and ANSI A137.3, Specifications for Gauged Porcelain Tile and Gauged Porcelain Tile Panels\/Slabs.<\/p>\n

\"A<\/a>
Figure 1: ANSI A118.19\u2013Section 5.1, Indentation resistance. Two grout specimens are molded. One is tested after drying for 28 days at \u226570.3 kg\/cm (\u22651,000 psi). The second test is after 21 days of drying, immediately followed by seven days of immersion in water at \u226535.2 kg\/cm2 (\u2265500 psi). Allowable indentation is \u22641.14 mm (\u22640.04 5in.).<\/figcaption><\/figure>\n
\"Table<\/a>
Figure 2: ANSI A118.19\u2013Section 3.0, Property requirements for organic premixed grouts. Table courtesy ANSI A108, A118, and A136, Standard Specifications for the Installation of Ceramic Tile<\/em><\/figcaption><\/figure>\n

Since the formulations of this type of grout vary between manufacturers and cement and epoxy grout formulations, developing the ANSI A118.19 material standard required new test methods. For example, testing methods for indentation resistance were deemed more relevant than compressive strength since grout joints have become much smaller and would rarely see a direct point load at 3 mm (0.11 in.) (Figure 1). The new standards followed extensive testing by the Materials & Methods Standards Association (MMSA) and review and acceptance by the American National Standards Institute (ANSI) (Figure 2).<\/p>\n

What is premixed grout?<\/h2>\n

ANSI A118.19 defines organic premixed grout \u201cas a ready for use, factory prepared mixture of water, polymers, aggregates, pigments and other materials to produce water resistant, stain resistant, and uniformly colored materials.\u201d Delving into the product\u2019s definition helps one better understand what makes this type of grout a standout material.<\/p>\n

Premixed, ready-to-use, factory prepared<\/h3>\n

All the grout\u2019s chemical components are accurately measured and blended during manufacturing. No additional water or resinous material is added prior to installation, ensuring color uniformity and long-term durability that could otherwise be compromised by the improper mixing of water or resins on the job.<\/p>\n

Polymers<\/h3>\n

Polymers play a crucial role in grout composition by forming a strong adhesive bond between the organic filler and pigment components and the tiles\u2019 edges. This enhances crack and abrasion resistance and boosts water and stain resistance. Another great advantage of the polymers in single-component premixed grouts is the elimination of efflorescence, as they do not use portland cement as a binder in their formulation.<\/p>\n

Water-resistant and stain-resistant<\/h3>\n
\"Two<\/a>
Figure 3: Water and stain resistance are verified by the water bead on the grout joint. A darkening of the grout beneath the water bead would have indicated an absorptive surface prone\u00a0to staining. The no sealer requirement of organic premixed grouts makes regular maintenance easier. Photos courtesy Custom Building Products<\/em><\/figcaption><\/figure>\n

Single-component grouts never require a sealer. The adhesive polymer fills very small voids between the organic filler and pigments, creating an impenetrable film on the grout\u2019s surface. Lacking open pores, the cured grout is easier to clean, and mold and bacterial growth within the grout are eliminated. Some single-component grouts even exceed epoxy grout\u2019s stain resistance to common stains (Figure 3).<\/p>\n

Considering its many attributes, a single-component, premixed organic grout seems to eliminate the need for cementitious and epoxy grouts. The term \u201corganic\u201d is often associated with mastics, and single-component grouts share some general similarities with them. These grouts can offer several potential benefits: improved indoor air quality due to lower VOCs, a safer option for installers who are allergic to epoxy-based products, and easier maintenance since they are more resistant to staining. One grout product can now be used on all residential and commercial tile installations, but can a grout choice be this simple? Unfortunately, not.<\/p>\n

While the simplicity of choosing a single-grout product is appealing, it is crucial to evaluate additional factors before reaching a decision. Factors such as the costs of material, installation, maintenance requirements, heat and chemical resistance, and the aesthetic and functional longevity of the grout play a significant role in determining the most suitable option for a project.<\/p>\n

The grout\u2019s price should never be the sole determinant when selecting a product. By considering these aspects, one can make an informed decision that aligns with the project\u2019s budget and performance requirements and the project owner\u2019s vision.<\/p>\n

Standards<\/h2>\n

For a better understanding of tile setting methods and materials, ANSI A108, A118, and A136, Standard Specifications for the Installation of Ceramic Tile and the TCNA Handbook for Ceramic, Glass and Stone Tile Installation should be in everyone\u2019s technical library. There are several necessary ANSI standards for tile grouts.<\/p>\n

The specification, ANSI A108.10, Installation of Grout in Tilework, describes the minimum requirements for grouting ceramic, porcelain, glass, and natural stone tile. It is currently under review for revision. Some of the pending revisions will better define the grouting requirements of large-format tiles, particularly large rectangular formats exhibiting warpages and installed with offset grout joints, as well as the different performance characteristics of each grout type.<\/p>\n

ANSI A118, Material Specifications, lists four types or formulations of grout available for residential and commercial installations. Listed from the lowest to highest cost and overall performance:<\/p>\n