Cement-based grout is a mixture of cement, water, and sand (or pigment), which creates a porous surface that acts like a sponge for liquids, dirt, and bacteria. Because of this porosity, all cementitious grouts must be sealed to prevent permanent staining and degradation. Whether you are using a standard sanded grout for floor tile or an unsanded grout for thin joints in wall tile, the chemical composition remains inherently open to absorption. Conversely, resin-based grouts, commonly referred to as epoxy grout, consist of epoxy resins and a filler powder. This chemical structure makes the cured grout non-porous and naturally resistant to liquids, chemical cleaners, and staining. Therefore, epoxy grout does not require any sealing. If you are unsure which type of grout is in your home, performing a water absorption test can help determine if the material is permeable and in need of a protective sealant layer. For cement-based installations, sealing should be performed as part of a recurring maintenance schedule to ensure maximum protection.
Key considerations
- grout types that need sealing
- is grout porous
- cement vs epoxy grout
- cement grout
- sanded grout
- unsanded grout