Grout Types Guide: Cementitious, Epoxy, and More
Learn grout types from cementitious to epoxy, when to use each, and how maintenance varies so you pick grout for bathrooms, kitchens, and outdoor tiles.
What grout types are and why they matter
According to Grout Maintenance, grout types are the backbone of tile performance, influencing how long joints stay intact, how easy they are to clean, and how resistant they are to moisture and staining. Grout is more than a color choice; it is a structural and cosmetic component of tiled surfaces. The main categories are cementitious grout, epoxy grout, and newer hybrid or specialty blends. Cementitious grout is the traditional option, typically made from Portland cement and water, sometimes with polymers to boost performance. Epoxy grout is resin based, highly stain resistant, and generally more durable in demanding environments. Knowing the differences helps you match the grout type to each project, whether it is a kitchen backsplash, a shower enclosure, or an outdoor patio. Your tile type, substrate, and exposure to water will guide whether you choose a sanded or unsanded cementitious grout, epoxy, or a hybrid formulation. This guide uses practical examples from real home projects to illustrate typical applications.
Cementitious grout families: Portland cement and polymer-modified
Cementitious grout is the most common choice in residential tile work because it blends well with ceramic, porcelain, and stone tiles and is relatively affordable. There are two broad families: standard Portland cement based grout and polymer modified grout. Standard cementitious grout is easy to mix and widely available, but it is porous and can stain if not sealed in damp areas. Polymer-modified cement grout adds latex or acrylic polymers to improve flexibility, bond strength, and water resistance. Within these families, you will see two main grain sizes: unsanded grout is used for fine joints and delicate tiles, while sanded grout strengthens wider joints on high-traffic floors and outdoor installations. For a DIYer, choose a product labeled as suitable for your joint width and tile type. Remember that cementitious grout typically benefits from sealing after curing to protect against moisture and stains, especially in showers and kitchens.