Grout fills the space between tiles installed in showers and tubs and on floors and countertops. Over time, grout tends to accumulate dirt and grime on floors and countertops. In places where moisture is present, like showers and tubs, the grout can also darken due to mold and mildew growth. In order to protect your grout and keep it looking its best, it’s smart to seal the material on a regular basis. The frequency for grout sealing depends on several factors, including the tile location, the level of traffic, the type of grout installed, and the sealant product you use.
Traditional grout includes cement and pigments, while epoxy grout is less porous since it’s made from a type of plastic. Sanded and unsanded traditional grout materials are porous and should be sealed regularly. While epoxy grout resists mold growth, it can still attract dirt and grime. You can choose between penetrating sealant products, which are best for porous grout, and film sealant products, which are meant for epoxy grout. A film coating can also alter the color of cement-based grout.
Most experts recommend sealing your grout at least annually, although rooms with lower volumes of traffic, such as rarely-used guest bathrooms, can go up to two years between sealant applications. You can also watch for signs that the grout needs to be resealed, such as chipping, cracking, or darkening on the grout lines. Make sure to clean your grout thoroughly before sealing it, or you may end up trapping dirt and mold behind the product.
Allow the sealant to dry completely, which usually takes between 24 and 48 hours, before using the shower or walking on the tile floor. A good sealant can reduce the time it takes to scrub and clean your grout, so it’s well worth the effort to reapply every 12-24 months.
Source: Contemporary Tile, Hunker, Bob Vila
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